电气工程及其自动化专业英语期末复习资料整理
电气工程及其自动化专业英语复习资料
1.1.1 We consider the flow of electric charges. A unique feature of electric charge or electricity is the fact that it is mobile; that is, it can be transferred from one place to another, where it can be converted to another form of energy.我们认为电荷是流动的。
电荷和电的特点是它具有流动性；即它可以从一个地方转移到另一个地方，在转移的过程中，电荷或电能转变为另一种形式的能量。
1.1.2 The power absorbed or supplied by an element is the product of the voltage across the element and the current through it.一个元件吸收或者发出的功率是元件两端的电压和通过该元件的电流的乘积。
1.2.1 We might observe at this point that the polarity marks on Fig.1-4(b) are redundant since the polarity could be defined by the positions of the longer and shorter lines.大家或许注意到图1-4(b)所标注的极性是多余的。
因为恒压源的极性可以用长线、短线来定义。
1.2.2 It should be noted that an ideal voltage source (dependent or independent) will produce any current required to ensure that the terminal voltage is as stated, whereas an ideal current source will produce the necessary voltage to ensure the stated current flow.应该注意一个理想电压源，(独立和受控)可向电路提供任意电流，以保证其端电压为规定值，而理想电流源，可向电路提供任意电压以保证其规定电流。
电气工程及其自动化期末考试资料(专升本)2020学年专升本大学英语III复习资料
Part I Choose a Chinese Expression in Column B for the word in Column A.(在B 组中结合A组中的单词找一个合适的中文解释) (每题1分，共15分)1．a llow A. 顾客2．o verseas B. 记得，记住3．c ompetition C. 便宜货4．m onth D. 接受5．r emember E. 餐馆，饭店6．i nformation F. 婚礼，结婚7．r estaurant G. 信息8．h elpful H. 目标，目的9．b argain I. 海外的10．textbook J. 机构，组织11．organization K. 教科书12．objective L. 允许13．accept M. 比赛，竞赛14．wedding N. 月份，一个月的时间15．customer O. 有帮助的，有益的Part II Directions: Choose the best answer to complete the sentences (每题1分，共20分)Section A16.Young as she is, Mary is very good at difficult customers.A. handleB. handlingC. handledD. handles17. After explaining his plan in great detail, Bob _______ in main points in a few sentences.A. summarizedB. summarizeC. summarizingD. to summarize18. The doctor insisted that everything would be alright. , I cannot help worrying about the safety of the child.A. InsteadB. AndC. NeverthelessD. While19. After spending a year in Australia, the little girl has gained a good ______ of spoken English.A. dealB. workC. commandD. job20. Though she is nearly 65, Mary does not want to .A. marryB. retireC. workD. sleep21. Einstein once said: “is more important than than knowledge.A. imaginingB. imaginationC.to imagineD. imagination22. The government is taking effective measures to overcome difficulties.A. currentB. corruptC. consentD. content23. The houses in our are very expensive.A. neighborhoodB. neighbourC. neighborsD. nearby24. The result of every accident, however , is a rise in the cost of insurance.A. radicalB. rareC. reluctantD. minor25. He says you are the best candidate.A.by farB. by nowC. by the wayD. by means26. The boat , throwing the boys into the water.A. flow awayB. started awayC. departed forD. turned over27. , the fire was discovered soon after it had started.A. FortunatelyB. GenerallyC. CompletelyD. Absolutely28. all the effort, they did not succeed.A. InsteadB. WithC. In spite ofD. After29. “Is there anything in your personal life which would the party if it becamepublic?”A. disturbB. embarrassC. wakenD. involve30. Parents worry about the harmful ______ of TV violence on their children.A. infectB. affectC. effectD. insect31. I’d like to that students should be allowed more time for independent study.A. proposeB. commandC. arrangeD. steer32. It can be argued, for example, that teaching can be more effectively ifteacher and student taketheir appropriate roles.A. disciplinedB. handledC. accomplishedD. proposed33. A sign at our local church is in wood, with gold lettering, but the isalready fading after three years.A. productB. latterC. laterD. medal34. The river at its mouth where it meets the sea.A. broadensB. extendsC. becomesD. explores35. This new expressway the trip from the city to the capital.A. shortB. shorteningC. to shortenedD. shortenSection B16. Our English teacher takes part in the 800-meter race. Let’s________ him.A. look atB. Cheer forC. come onD. call on17. How many big colleges are there in this city? Let me ________.A. tryB. learnC. doD. count18. What kind of events are you good ________?A. atB. withC. onD. in19. There are two cars here. One is big, and ________ is small.A. anotherB. otherC. an otherD. the other20. He is very ________. He often comes first in shot putting.A. simpleB. strongC. strictD. small21. Look, Lily is on ________ track!A. fiveB. the fiveC. fifthD. the fifth22. Do you often go ________ in the seaA. swimB. swimmingC. swamD. swiming23. May I ask ________ is calling?A. whoB. whomC. sheD. he24. ________ does the plane arrive?A. WhenB. WhatC. WhereD. How25. _____________ will the journey take?A. How oftenB. How muchC. How longD. How about26. Jane has worked there _____________ five hours.A. forB. inC. atD. from27. I received a letter _____________ English.A. inB. toC. fromD. with28. What can I _____________ for you, Madam?A. didB. doneC. doesD. do29.Swimming and painting _____________ two of my special interests.A. areB. isC. wasD. has30. _____________ over the sea can get rather boring after a while.A. FlyB. FlyingC. FliesD. Flied31. Please _____________ me introduce my sister to you.A. giveB. haveC. letD. ask32. You should fill in this application _____________ very carefully.A. passportB. letterC. visaD. form33. _____________ to the Chinese Culture Club. You can learn Beijing opera here.A. ComingB. WelcomeC. Well comeD. Will come34. The monitor takes care _____________ the class.A. ofB. inC. atD. over35. The big tree _____________ a lot of red apples.A. bearsB. wearsC. growsD. takesPart III Reading Comprehension (每题共40 分)Section A Reading and Blank-filling(每题1分，共10分)Directions:In this section, there is a passage with ten blanks. You are required toselect one word for each blank from a list of choices given in a word bank following the passage. Read the passage through carefully before making your choices. Each choice in the bank is identified by a letter. Please mark the corresponding letter for each item on the Answer Sheet.I like the street market in the city center in this small American town. It often36. _____________ me of the open-air market in my hometown. The market is full of sounds. The music plays 37. _____________, and people are calling to their friends. There are lots of different 38. _____________, too--- fried onions, coffee and fresh bread. All kinds of things are for 39. _____________ there --- food and vegetables, shoes and dresses, CDs and clocks. And there are all kinds of people doing 40. _____________ things --- selling, buying, talking, eating, trying on clothes, and just walking around.I went there with my 41. _____________ friend Bill last Saturday afternoon. We walked through the 42. _____________ slowly, looking at this and that. Suddenly, when we turned a corner, we found the sky 43. _____________ with colored hands: blue, red, pink, yellow, 44._____________ and white. I was so surprised that I stopped short with my mouth open. But I soon smiled and took out my 45. ____________: --- What a wonderful view, with all those beautiful gloves dancing in the sun.Section B Reading in Depth (每题2分，共20分)Directions: There are 3 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice and write your choice on the Answer Sheet.第一部分Passage 1Some cities have planned their transportation systems for ear owners. That is what Los Angeles did. Los Angeles decided to build highways for cars rather than spending money on public transportation.This decision was suitable for Los Angeles. The city grew outward instead of upward. Los Angeles never built many tall apartment buildings. Instead, people live in houses with gardens.In Los Angeles, most people drive cars to work. And every car has to have a parking space. So many buildings where people work also have parking tots.Los Angeles also became a city without a Central Business District (CBD). If a city has a CBD, crowds of people rush into it every day to work. If people drive to work, they need lots of road space.So Los Angeles developed several business districts and built homes and other buildings in between the districts. This required more roads and parking spaces.Some people defend this growth pattern. They say Los Angeles is the city of the future.46. According to the passage, Los Angeles is a city where ______.A. there is no public transportation systemB. more money is spent on highways for carsC. more money is spent on public transportation systemsD. public transportation is more developed than in other cities47. "The city grew outward instead of upward" (Line 1, Para. 2) means ______.A. the city became more spread out instead of growing tallerB. there were fewer small houses than tall buildingsC. rapid development took place in the city centerD. many tall buildings could be found in the city48. According to the passage, if a city has several business districts, ______.A. people won't have to drive to work every dayB. there have to be more roads and parking spacesC. companies would be located in between the districtsD. there would be no need to build parking spaces within the districts49. According to the growth pattern of Los Angeles, homes were mainly built ______.A. in the city centerB. along the main roadsC. around business districtsD. within the business districts50. The passage is mainly about ______.A. the construction of parking spaces in Los AngelesB. the new growth pattern of the city of Los AngelesC. the public transportation system in Los AngelesD. the problem of traffic jams iii Los AngelesPassage 2What makes a person a scientist? Does he have ways or tools of learning that are different from those of others? The answer is “no”. It is not the tools a scientist uses but how he uses these tools that makes him a scientist. You will probably agree that knowing how to use a power is important to a carpenter. You will probably agree, too, that knowing how to investigate, how to discover information, is important to everyone. The scientist, however, goes one step further, he must be sure that he has a reasonable answer to his questions and that his answer can be confirmed by other persons. He also works to fit the answers he gets to many questions into a large set of ideas about how the world works.The scientist’s knowledge must be exact. There is no room for half right or right just half the time. He must be as nearly right as the conditions permit. What works under one set of conditions at one time must work under the same conditions at other times. If the conditions are different, any changes the scientist observes in a demonstration must be explained by the changes in the conditions. This is one reason that investigations are important in science. Albert Einstein, who developed the Theory of Relativity, arrived at this theory through mathematics. The accuracy of his mathematics was later tested through investigations, and Einstein’s ideas were shown to be correct. A scientist uses many tools for measurements. Then the measurementsare used to make mathematical calculations that may test his investigations.51. What makes a scientist according to the passage? ________A. The tools he uses.B. The way he uses his tools.C. His ways of learning.D. The various tools he uses.52. The underlined part in the passage shows_______.A. the importance of informationB. the importance of thinkingC. the difference between scientists and ordinary peopleD. the difference between carpenters and people with other jobs53. A sound scientific theory should be one that _________.A. works not only under one set of conditions at one time, but also under the sameconditions at other timesB. does not allow any changes even under different conditionsC. can be used for many purposesD. leaves no room for improvement54. The author quotes the case of Albert Einstein to illustrate __________.A. that measurements are keys to success in scienceB. that accuracy of mathematicsC. that investigations are important in scienceD. that the mathematical calculations may test his investigations55. What is the main idea of the passage? ________A. The theory of relativity.B. Exactness is the core of science.C. Scientists are different from ordinary people.D. Exactness and ways of using tools are the keys to the making of a scientist.第二部分：Passage 1Perhaps you are going to finish school soon and, like many other students, youwant to further your study abroad. Here are some points you should remember if you intend to apply for a scholarship to study in the United States of America.First of all, you will have to ask for an application form, fill in the form with great care, and then send it in with a copy of your school records. After that, you will have to ask your teachers to write some letters of reference. You will also need to take some tests such as TOEFL and GRE. You may apply to several universities at the same time. Overseas students in the States are not allowed to work in their spare time except in the summer.46. This passage is taken from a book for _______.A. professors visiting AmericaB. people who are going to work in AmericaC. American students who are going to graduateD. those who want to study in American universities47. The passage is mainly about how to _____________A. get a jot.B. take TOEFL.C. write a resumeD. apply for a scholarship.48. What is the first step to take in applying to an American university?A. To send school records.B. To write to ask for an application form.C. To provide the TOEFL score report.D. To supply letters of reference.49. What else is needed to be sent with the application form?A. School records.B. TOEFL score reports.C. Reference letters.D. Work permit.50. Which of the following statements is true?A. Overseas students are allowed to work in their spare time in the United States.B. You don’t need reference letters for application.C. Summer is the time when foreign students can work in their spare time.D. You cannot apply to several universities at the same time in the United States. Passage 2As there are so many nationalities in American, people can find almost any kind of restaurants in most of the large cities. The telephone book lists restaurants for each city according to the name, area of the city, or kind of food. Restaurants in large cities vary greatly in price. Many restaurants put up their menus on the window, and you are not sure about how expensive the place is, ask to see a menu before you sit down at a table, or just ask about the price. Appearances from the outside can be misleading--- what looks like a smell, informal restaurant may really be very expensive, and what looks like a large, expensive restaurant may be very reasonable.You can get a meal for about $4 or $5 or a little more if you eat in a snack bar of coffee shop, but in most city restaurants you should expect to pay $8 to $10 a person for dinner, with alcoholic drinks and wine extra. Prices in New York City are even higher.51. Restaurant in each city are listed in the telephone book according to __________.A. area of the cityB. name of the restaurantC. kind of foodD. any of the above52. Where can you see the menus in many restaurants?A. On the tables.B. On the door.C. On the window.D. On the walls53. To let people get some idea of __________, many restaurants have their menuput up on the window.A. the price of the foodB. the area of the cityC. the restaurantD. the kind of service provided54. In most city restaurants, what is the usual dinner price for a person?A. $4 to $6B. $4 to $8C. $6 to $8D. $8 to $1055. What does the passage intend to tell us?A. Prices in New York are very even higher.B. Restaurants in big cities vary greatly in price.C. Appearances of the restaurant from the outside can give you some wrong idea.D. Any kind of restaurants can be found in most of the large cities.Section C skimming and scanning (每题2分，共10分)Directions: Decide whether the statements are true (T) or false (F) according to the passage .When you go shopping, there are three points you should remember in order to save money.First, read as many shopping ads as you can. In this way, you’ll have a clear picture of where to buy things at the lowest prices. If you are lucky, you’ll get go od bargains at even lower prices than you expected.Second, collect some coupons which offer discounts. With these coupons, you can save some money.Third, you must remember that prices vary from store to store and from time to time. When you visit open-air markets, flea markets, or yard sales, the prices of some goods are not final. There are always changes that you can get good buys by bargaining or asking for discounts.Remember these points when you go shopping, and you’ll save money.( ) 56. You can bargain over the prices of goods at most open-air markets( ) 57. You can save money by collecting more coupons.( ) 58. Prices may be different in different stores and different times.( ) 59. Shopping ads will help you to buy things at a lower price.( ) 60. The three suggestions given will help you make money.Part IV Translate the following sentences into English (每题3分，共15分)Section A61. 在生活中，我们最愚蠢的行为就是太执着于自己的东西，不愿意放弃。
电气工程及其自动化专业英语
time-invariant 时不变的
self-(or mutual-)induction 自（互）感
displacement current 位移电流 conductance 电导
voltage drop 电压降 volt-ampere characteristics 伏安特性
metal-filament lamp 金属丝灯泡
seen, increase of current from zero to
I≈I1 causes the terminal voltage of the source to decrease linearly
V12=V=E－VS=E－RSI
Fig.1.3
In other words, the voltage drop VS across the source resistance rises in proportion to the current. This goes on until
电气工程及其自动化专业英语
电气工程及其自动化专业英语Section I basic electric circuitChapter 1 Introduction to electric circuitsNew Words and Expressions1. electrical circuit n. 电路2. voltage n. 电压，伏特3. curre nt n. 电流，通用的，流通的，现在的4. curre nt flow n. 电流5. resistor n. 电阻，电阻器6. battery n. 电池7. load n. 负载，负荷8. performa nee n. 性能9. circuit diagram n. 电路图10. idealized model n. 理想模型Introduction*A simple circuit and its components.idealized model of the circuit*Model can be cha nged if n ecessary.*summarizeIn elementary physics classes you undoubtedly have been introduced to the fun dame ntal con cepts of electricity and how real comp onen ts can be put together to form an electrical circuit. A very simple circuit, for example, might consist of a battery, some wire, a switch, and an incandescent light bulb as shown in Fig.1-1. The battery supplies the en ergy required to force electro ns around the loop, heati ng the filame nt of the bulb and caus ing the bulb to radiate a lot of heat and some light.Energy is transferred from a source, the battery, to a load, the bulb———You probably already know that the voltage of the battery and the electrical resista nee of the bulb have something to do with the amount of curre nt that will flowin the circuit. From your own practical experienee you also know that no current will flow until the switch is closed. That is, for a circuit to do anything, the loop has to be completed so that electro ns can flow from the battery to the bulb and the n back aga in to the battery. And fin ally, you probably realize that it doesn t much matter, whether there is on e foot or two feet of wire connecting the battery to the bulb, but that it probably would matter if there is a mile of wire between it and the bulb.Also shown in Fig. 1-1 is a model made up of idealized components. The batteryis modeled as an ideal source that puts out a constant voltage, VB, no matter what amount of curre nt, i, is draw n. The wires are con sidered to be perfect con ductors that offer no resista nee to curre nt flow. The switch is assumed to be ope n or closed. There is no arcing of curre nt across the gap whe n the switch is ope ned, nor is there any bounce to the switch as it makes con tact on closure. The light bulb is modeled as a simple resistor, R, that never changes its value, no matter how hot it becomes or how much curre nt is flow ing through it.Fig. 1-1 (a) A simple circuit(b) An idealized represe ntati on of thecircuitFor most purposes, the idealized model shown in Fig. 1-1b is an adequate represe ntati on of the circuit; that is, our prediction of the current that will flow through the bulb whenever the switch is closed will be sufficiently accurate that we can consider the problem solved. There may be times, however, when the model is in adequate. The battery voltage, for example, may drop as more and more curre nt is drawn, or as the battery ages. --------------------------------- T he light bulb' s resistance may change as it heats up, and the filame nt may have a bit of inductance and capacitance associated with it as well as resistance so that when the switch is closed, the current may not jump in sta ntan eously from zero to some fin al, steady state value. The wires may beundersized, and some of the power delivered by the battery may be lost in the wires before it reaches the load. These subtle effects may or may not be important, depending on what we are trying to find out and how accurately we must be able to predict the performa nee of the circuit. If we decide they are importa nt, we can always cha nge the model as n ecessary and then proceed with the an alysis. The point here is simple. The comb in ati ons of resistors, capacitors, in ductors, voltage sources, curre nt sources, and so forth, that you see in a circuit diagram are merely models of real comp onents that comprise a real circuit, and a certa in amount of judgme nt is required to decide how complicated the model must be before sufficie ntly accurate results can be obta in ed. For our purposes, we will be using very simple models in general, leav ing many of the complicati ons to more adva need textbooks.Chapter 2Definitions of key electrical quantitiesNew Words and Expressionscharge n. vt.电荷；充电nu cleus n.原子核(pl.); nuclear adj.n egative n.否定，负数，底片adj.否定的，消极的，负的，阴性的positive adj.［数］正的adj.［电］阳的in gen eral 通常,大体上，一般而言，总的说来algebraic adj.代数的，关于代数学的soluti on to the circuit problem n.关于电路问题的解法the un its of power n.功率的单位direct curre nt (dc) n 直流电alter nat ing curre nt(ac) n.交流电sinu soidally adv.正弦地tran sistor n.晶体管Part 1 Charge and CurrentAn atom con sists of a positively charged nu cleus surro un ded by a swarm of n egativelycharged electr ons. The charge associated with one electr on has bee n found to be 1.602 x 10- 19 coulombs; or, stated the other way around, one coulomb can be defined as the charge on 6.242 x 1018 electro ns. While most of the electr ons associated with an atom are tightly bound to the nu cleus, good con ductors, like copper, have free electrons that are sufficie ntly dista nt from their nu clei that their attract ion to any particular n ucleus is easily overcome. These con ducti on electr ons are free to wan der from atom to atom, and their moveme nt con stitutes an electric curre nt.In a wire, when one coulomb ' s worth of charge passes a given spot in one second, the current is defined to be one ampere (abbreviated A), named after the nineteenth-century physicist Andr ' e Marie Amp'ere. That is, curre nt i is the net rate of flow of charge q past a point, or through an area:i=d q/d t (1.1)In general, charges can be negative or positive. For example, in a neon light, positive ions move in one direct ion and n egative electr ons move in the other. Each con tributes to curre nt, and the total curre nt is their sum. By conven ti on, the direct ion of curre nt flow is take n to be the direct ion that positive charges would move, whether or not positive charges happen to be in the picture. Thus, in a wire, electrons moving to the right constitute a current that flows to the left, as shown in Fig.1-2.(〉)dq--- / =—dtFig. 1-2 By conven tio n, n egative charges movi ng in one direct ion con stitute a positive curre ntflow in the opposite direct ionW/hen charge flows at a steady rate in one direction only, the current is said to be direct current, or 血A battery, for example, supplies direct curre nt. When charge flows back and forth sinusoidally, it is said to be alternating current, or ac. In the United States the ac electricity delivered by tes of ac and dc are show n in Fig.1-3.Time ―(a)Fig. 1-3 (a) Steady-state direct curre nt (de) (b) Alter nat ing curre nt(ac)Part 2 Kirchhoff' s Current LawTwo of the most fun dame ntal properties of circuits were established experime ntally a cen tury and a half ago by a Germa n professor, Gustav Robert Kirchhoff (1824 - 1887). The first property, known as Kirchhoff ' s current law (abbreviated KCL), states that at every instant of time the sum of the curre nts flow ing into any node of a circuit must equal the sum of the curre nts leavi ng the no de, where a node is any spot where two or more wires are join ed. This is a very simple, but powerful con cept. It is in tuitively obvious once you assert that curre nt is the flow of charge, and that charge is con servative—n either being created nor destroyed as it en ters a no de. Uni ess charge somehow builds up at a no de, which it does not, the n the rate at which charge en ters a node must equal the rate at which charge leaves the no de.There are several alter native ways to state Kirchhoff ' s curre nt law. The most com monly used stateme nt says that the sum of the curre nts flow ing into a node is zero as show n in Fig. 1-4a, in which case some of those curre nts must have n egative values while some have positive values. Equally valid would be the stateme nt that the sum of the curre nts leav ing a node must be zero as show n in Fig. 1-4b(aga in some of these curre nts n eed to have positive values and some n egative). Fin ally, we could say that the sum of the curre nts en teri ng a node equals the sum of the curre nts leav ing a node (Fig. 1-4c). These are all equivale nt as long as we un dersta nd what is meant about the directi on of curre nt flow whe n we in dicate it with an arrow on a circuit diagram. Curre nt that actually flows in the directi on show n by the arrow is give n a positive sig n. Curre nts that actuallyflow in the opposite direct ion have n egative values.(a) The sum of the curre nts into a node equals zero(b) The sum of the curre nts leav ing the node is zero(c) The sum of the curre nts en teri ng a node equals the sum of the curre nts leavi ng the node Note that you can draw curre nt arrows in any directio n that you want — that much is arbitrary — but once havi ng draw n the arrows, you must the n write Kirchhoff ' s curre nt law in a manner that is con siste nt with your arrows, as has bee n done in Fig.1-4. The algebraic soluti on to the circuit problem will automatically determ ine whether or not your arbitrarily determ ined direct ions for curre nts were correct.Example 1.1 Using Kirchhoff ' s Current LawA node of a circuit is shown with current direction arrows chosen arbitrarily. Havingpicked those directi on s, i1 = - 5 A, i2 = 3 A, and i3 = - 1 A. Write an expressi on for Kirchhoff ' s current law and solve for i4.Solution. By Kirchhoff ' s current law,i1 + i2 = i3 + i4 so thatThat is, i4is actually 1 A flowi ng into the no de. Note that i2, i3, and i4 are all en teri ng the no de, and i1 is the only curre nt that is leavi ng the no de.Part 3 Kirchhoff ' s Voltage LawElectr ons won ' t flow through a circuit uni ess they are give n some en ergy to help send them on their way. That “ push ” is measured in volts, where voltage is defi ned to be the amount nodenodenode1 + i4 i4 = - 1 AFig. 1-4 lllustrating various ways that Kirchhoff ' s current law can be statedof en ergy (w, joules) give n to a un it of charge,v=dw/dq A 12-V battery therefore gives 12 joules of en ergy to each coulomb of charge that it stores. Note that the charge does not actually have to move for voltage to have meaning. Voltage describes the potential for charge to do work.While curre nts are measured through a circuit comp onent, voltages are measured across componen ts. Thus, for example, it is correct to say that curre nt through a battery is 10 A, while the voltage across that battery is 12 V. Other ways to describe the voltage across a comp onent in clude whether the voltage rises across the comp onent or drops. Thus, for example, for the simple circuit in Fig. 1-1, there is a voltage rise across the battery and voltage drop across the light bulb. Voltages are always measured with respect to someth ing. That is, the voltage of the positive terminal of the battery is“ so many volts ” with respect to the negative terminal; or, the voltage at a point in a circuit is some amount with respect to some other poin t. In Fig. 1-5, curre nt through a resistor results in a voltage drop from point A to point B of VAB volts. V A and VB arethe voltages at each end of the resistor, measured with respect to some other point.The reference point for voltages in a circuit is usually desig nated with a ground symbol. While many circuits are actually groun ded — that is, there is a path for curre nt to flow directly into the earth —some are not (such as the battery, wires, switch, and bulb in a flashlight). When a ground symbol is show n on a circuit diagram, you should con sider it to be merely a reference point at which thevoltage is defi ned to be zero. Fig.1-6 points out how cha nging the node labeled as ground cha nges the voltages at each node in the circuit, but does not cha nge the voltage drop across each comp onent.(1-2)Fig. 1-5 The voltage drop from point A to point B is V AB, where VAB = VA - VBThe sec ond of Kirchhoff ' s fun dame ntal laws states that the sum of the voltages around any loop of a circuit at any instant is zero. This is known as Kirchhoff ' s voltage law (KVL). Just as was the case for Kirchhoff ' s curre nt law, there are alter native, but equivale nt, ways of stat ing KVL. We can, for example, say that the sum of the voltage rises in any loop equals the sum of the voltagedrops around the loop. Thus in Fig. 1-6, there is a voltage rise of 12 V across the battery and avoltage drop of 3 V across R1 and a drop of 9 V across R2. ------------- Notice that it doesn' t matterwhich node was labeled ground for this to be true. Just as was the case with Kirchhoff ' s current law, we must be careful about labeli ng and in terpret ing the sig ns of voltages in a circuit diagram in order to write the proper vers ion of KVL. A plus (+) sig n on a circuit comp onent in dicates a reference direct ion un der the assumpti on that the pote ntial at that end of the comp onent is higher than the voltage at the other end. Aga in, as long as we are con siste nt in writi ng Kirchhoff ' s voltage law, the algebraic soluti on for the circuit will automatically take care of sig ns.Part 5 Summary of Principal Electrical QuantitiesThe key electrical qua ntities already in troduced and the releva nt relati on ships betwee n these quantities are summarized in Table 1-1.Since electrical quantities vary over such a large range of magnitudes, you will often find yourself work ing with very small qua ntities or very large qua ntities. For example, the voltage created by your TV antenna may be measured in millionths of a volt (microvolts, 卩V), while the power gen erated by a large power stati on may be measured in billi ons of watts, or gigawatts (GW). To describe quantities that may take on such extreme values, it is useful to have a system of prefixes that accompany the units. The most commonly used prefixes in electrical engineering are give n in Table 1-2.Part 6 Ideal Voltage Source and Ideal Current SourceElectric circuits are made up of a relatively small nu mber of differe nt kinds of circuiteleme nts, or comp onen ts, which can be in terc onn ected in an extraord in arily large nu mber of ways.At this point in our discussion, we will concentrate on idealized characteristics of these circuit eleme nts, realiz ing that real comp onents resemble, but do not exactly duplicate, the characteristics that we describe here.An ideal voltage source is one that provides a give n, known voltage vs, no matter what sort ofload it is conn ected to. That is, regardless of the curre nt draw n from the ideal voltage source, it will always provide the same voltage. Note that an ideal voltage source does not have to deliver a con sta nt voltage; for example, it may produce a sinu soidally vary ing voltage —the key is that voltage is not a fun ctio n of the amount of curre nt draw n. A symbol for an ideal voltage source is show n in Fig. 1-7.A special case of an ideal voltage source is an ideal battery that provides a con sta nt dc output, as show n in Fig. 1-8. A real battery approximates the ideal source; but as curre nt in creases, the output drops somewhat. To acco unt for that drop, quite ofte n the model used for a real battery is an ideal voltage source in series with the internal resista nee of the battery.An ideal curre nt source produces a give n amount of curre nt is no matter what load it sees. As show n in Fig. 1-9, a commo nly used symbol for such a device is circle with an arrow in dicati ng the directi on of curre nt flow. While a battery is a good approximati on to an ideal voltage source, there is nothing quite so familiar that approximates an ideal curre nt source. Some tran sistor circuits come close to this ideal and are ofte n modeled with idealized curre nt sources.Section II The electric power systemChapter 1 Brief Introduction to The Electric Power SystemNew Words and ExpressionsMinimum a 最小prime mover n 原动机gen erator n 发电机load n 负载furn ace n 炉膛boiler n 锅炉fissi on able n 可裂变的fissi on able material 核燃料Part 1 Minimum Power systemelevatio n n 高度，海拔internal combusti on engine 内燃机 steam-drive n turbi ne 汽轮机hydraulic turbi ne 水轮机convert v 变换，转换 shaft n 传动轴，轴 torquen 力矩servomecha nism n 伺服机构* Elements of a minimum electric power system *Types of energy source *Types of prime mover *Types of electrical load*Functions of the control systemA minimum electric power system is shown in Fig.1-1, the system consists of an energy source, a prime mover, a generator, and a load.The en ergy source may be coal, gas, or oil burned in a furnace to heat water and gen erate steam in a boiler; it may be fissi on able material which, in a nu clear reactor, will heat water to produce steam; it may be water in a pond at an elevatio n above the gen erat ing stati on; or it may be oil or gas burned in an internal combusti on engine.The prime mover may be a steam-driven turbine, a hydraulic turbine or water wheel, or aninternal combustion engine. Each one of these prime movers has the ability to convert energy in the form of heat, falling water, or fuel into rotation of a shaft, which in turn will drive theEnergy source Prime nioverGenerator Lx>adContjolFig* 1-1 The tninfnmm electric power systemgen erator.The electrical load on the gen erator may be lights, motors, heaters, or other devices, alone or in comb in ati on. Probably the load will vary from mi nute to min ute as differe nt dema nds occur. The control system functions (are ) to keep the speed of the machines substantially constant and the voltage within prescribed limits, even though the load may cha nge. To meet these load con diti on s, it is n ecessary for fuel in put to cha nge, for the prime mover in put to vary, and for the torque on the shaft from the prime mover to cha nge in order that the gen erator may be kept at con sta nt speed. In additi on, the field curre nt to the gen erator must be adjusted to maintain con sta nt output voltage. The con trol system may in clude a man stati oned in the power pla nt who watches a set of meters on the gen erator output term in als and makes the n ecessary adjustme nts manu ally .In a moder n stati on, the con trol system is a servomecha nism that sen ses gen erator-output con diti ons and automatically makes the n ecessary cha nges in en ergy in put and field curre nt to hold the electrical output with in certa in specificati ons.Part 2 More Complicated Systems*Foreword*Cases of power system with out circuit breaker *Power system with circuit breakerNew Words and Expressions1. associated2. circuit3. circuit breaker4. dee nergize5. dee nergized6. outage n7. diagram8. switch out of9. switch offIn most situati ons the load is not directly conn ected to the gen erator term in als. More com monlya 联接的 n 电路n 断路器 vt 切断，断电 adj 不带电的停电 n 简图退出来，断开 v 切断，关闭the load is some distanee from the generator, requiring a power line connecting them. It is desirable to keep the electric power supply at the load with in specificati ons. However, the con trols are near the generator, which may be in another building, perhaps several miles away.If the dista nce from the gen erator to the load is con siderable, it may be desirable to in stall transformers at the generator and at the load end, and to transmit the power over a high-voltage line (Fig.1-2). For the same power, the higher-voltage line carries less current, has lower losses for the same wire size, and provides more stable voltage., TransformerTransformerPrime 〔Mover Generator f C High-voltage line—Fig- 1-2 A generator connected through transformers anda high-voltage line to a distant loadIn some cases an overhead line may be un acceptable. In stead it may be adva ntageous to use an un dergro und cable. With the power systems talked above, the power supply to the load must be in terrupted if, for any reas on, any comp onent of the system must be moved from service for maintenance or repair.Additi onal system load may require more power tha n the gen erator can supply. Ano ther gen erator with its associated tran sformers and high-voltage line might be added.It can be shown that there are some advantages in making ties between the generators (1) and at the end of the high-voltage lines (2 and 3), as shown in Fig.1-3. This system will operate satisfactorily as long as no trouble develops or no equipment needs to be taken out of service.Kig. 1-3 A system with para)lei operation or the generators t of the transformers andof the transmission lintsThe above system may be vastly improved by the in troducti on of circuit breakers, which may be ope ned and closed as n eeded. Circuit breakers added to the system, Fig.1-4, permit selected piece of equipme nt to switch out of service without disturb ing the rema in der of system. With this arran geme nt any eleme nt of the system may be dee nergized for maintenance or repair by operati on of circuit breakers. Of course, if any piece of equipme nt is take n out of service, the n the total load must be carried by the remaining equipment. Attention must be given to avoid overloads duri ng such circumsta nces. If possible, outages of equipme nt are scheduled at times when load requireme nts are below no rmal.Low-voltageo=^GeneratorsFig.1-5 shows a system in which three gen erators and three loads are tied together by threeFig* 1-4 A system with necessary circuit breakerstran smissi on lin es. No circuit breakers are show n in this diagram, although many would berequired in such a system.Fis- 1-S Three generators supplying threeloads over hlgh-voltnge trAnsmlsston linesChapter 2 Faults on Power SystemNew Words and Expressions1. fault2. in terfere neen 干扰，防碍6. feed (fed)给。
电气工程及其自动化期末考试资料(专升本)《大学英语4》复习资料
《大学英语四》复习资料Part I Vocabulary and Structure (每题1分，共20分)Directions: In this section, there are 20 incomplete sentences, each followed by four choices marked A, B, C and D. Choose the one that BEST completes the sentence. Then on the Answer Sheet, write your choice.1.The temperature ____ throughout the day in that part of the country.A. veryB. remainsC. differsD. varies2.The game is full of violence and will certainly have a bad ____ on young players.A. meaningB. painC. lossD. influence3.The warm-hearted elderly lady downstairs is always ____ to help others.A. realB. readyC. practicalD. polite4.The question is ____ difficult in the exam today. Don’t you think so?A. thereforeB. sinceC. ratherD. otherwise5.She used to live in a lovely ____ building near the sea.A. 3-storyB. 3-storiesC. 3-classedD. 3-classes6.There are different ____ of transport in big cities for you to choose when you go out.A. meansB. meanC. meaningsD. meaning7.They did not take a rest until the job was ____ finished.A. straightlyB. speciallyC. completelyD. fairly8.The bookstore owner ____ the old magazines with a new ones to attract more readers.A. requiredB. reviewedC. repeatedD. replaced9.Would you like to buy the book? It is ____ reading.A.worthyB. firmC. furtherD. worth10.She wears sunglasses to ____ her eyes from the sunshine in summer.A. prepareB. produceC. protectD. provide11.We all like her very much for her pleasant ____: kind, gentle and warm-hearted.A. characterB. chanceC. chairmanD. skills12.All the students enjoyed the wonderful ____ by the professor that afternoon.A. discussionB. lectureC. adviceD. solution13.If you have confidence in yourself first, you will not be _______ by others easily.A.wonB. doubledC. defeated.D. delayed14.The little girl developed a strong _______ on her new friends.A. dependenceB. developmentC. independenceD. difference15.The student from the countryside was forced to quit school for ____ of money.A. loveB. lackC. lendingD. look16.Jack came to London for the ____ of seeing his girl friend.A. purposeB. supportC. sideD. sense17.The ____ of the pupils in our class have brown eyes; only three have blue eyes.A. matterB. masterC. majorD. majority18.Have you ____ your childhood dream of becoming a designer?A. metB. realizedC. accompaniedD. filled19.He _______ at me, and then asked me a question.A. startedB. staredC. setD. sent20.I have _______ for my secretary to meet you tomorrow.A. arrangedB. solvedC. offeredD. directedPart II Blank-filling （每题1分，共10分）Directions: In this section, there are ten sentences with blanks. You are required to select one word for each bank from a list of choices given in a word bank. Each choice in the bank is identified by a letter. Please mark the corresponding letter for each item on the Answer Sheet.21.The company will spend $6 million on sales strategies as well as the _____of new products.22.We all agreed on our basic aims, but when we got down to specific items it became more _____.23. Nowadays,consumers not only demand the high quality of the products but also their ______.24. The movie star was _____ in the act of shoplifting but was released after he left his ID to the supermarket.25. The soldiers______ to run away and the enemy, in pursuing them, were finally trapped .26. As a consequence of being in hospital, Shelly decided to become a _____.27. The village was isolated from the outside for three days ______ the flood.28. After the Second World War, millions of people were _____ homeless; so the government decided to give priority to housing.29. In many shops, shopping bags are _____for the customers' convenience .30. With a ______ love story and two famous stars, the movie has all the elements for a success.Part III Reading Comprehension (每题2分，共40分)Directions: There are 4 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them are four choices marked A, B, C and D. You should decide on the best choice and write your choice on the Answer Sheet.Passage OneIn the United States, when a person becomes rich, he wants people to know it. And even if he does not become very rich, he wants people to think that he is. That is what “keeping up with the Joneses” is about. It is the story of someone who tried to look as rich as his neighbors.The expression was first used in 1913 by a young American called Arthur Momand. He told this story about himself. He began earning $125 a week at the age of 23. That was a lot of money in those days. He got married and moved with his wife to a very wealthy neighborhood outside New York City. When he saw that rich people rode horses, Momand went horse-riding everyday. When he saw that rich people had servants, Momand and his wife also hired a servant and gave big parties for their new neighbors.It was like a race, but one could never finish this race because one was always trying to keep up. The race ended for Momand and his wife when they could no longer pay for their new way of life. They moved back to an apartment in New York City.Momand looked around him and noticed that many people do things just to keep up with rich lifestyle of their neighbors. He saw the funny side of it and started to write a series of short stories. He called it “Keeping up with the Joneses” because “Jones” is a very common name in the Untie States. “Keep up with the Joneses” came to mean keeping up with the rich lifestyle of the people around you. Momand’s series appeared in different newspapers across the country for over 28 years.People never seem to get tried of keeping up with the Joneses. And there are “Joneses” in every city of the world. Butone must get tired of trying to keep up with the Joneses because no matter what one does, Mr. Jones always seems to be ahead.31. Some people want to keep up with the Joneses because they _____.A. want to be as rich as their neighborsB. want others to know or to think that they are richC. don’t want others to know they are richD. want to be happy32. It can be inferred from the story that rich people like to _____.A. live outside New York CityB. live in New York CityC. live in apartmentsD. have many neighbors33. The underlined word “ neighborhood” in Para.2 means ________.A. a person who lives near anotherB. people living in an areaC. an area near the place referred toD. an area in another town or city34. Arthur Momand used the name “Jones” in his series of short stories because “Jones” is __________.A. an important nameB. a popular name in the United StatesC. his neighbor’s nameD. not a good name35. According to the writer, it is _____ to keep up with the Joneses.A. correctB. interestingC. impossibleD. goodPassage TwoPaper is one of the most important products ever invented by man. Wide spread use of written language would not have been possible without some cheap and practical material to write on. The invention of paper meant that more people could be educated because more books could be printed and distributed. Together with the printing press, paper provided an extremely important way to communicate knowledge.How much paper do you use every year? Probably you cannot answer that question quickly. In 1990 the world’s use of paper was about one kilogram for each person a year. Now some countries use as much as 50 kilograms of paper for each person a year. Countries like the United States, England and Sweden use more paper than other countries.Paper, like many other things that we use today, was first made in China. In Egypt and the West, paper was not very commonly used before the year 1400. The Egyptians wrote on a kind of material made of a water plant. Europeans used parchment for many hundreds of year. Parchment was very strong; it was made from the skin of certain young animals. We have learnt of the most important facts of European history from records that were kept on parchment. (208words)36.What’s the meaning for the word “parchment”?A.The skin of young animalsB.A kind of paper made from the skin of certain young animalsC.The paper used by European countriesD.The paper of Egypt37. Which of the following is not mentioned about the invention of paper?A.More jobs could be provided than beforeB.More people could be educated than beforeC.More books could be printed and distributedD.More ways could be used to exchange knowledge38.When did the Egyptians begin to use paper widely?A.Around 1400B.Around 1900C.Around 400D.Around 90039. Which of the following countries uses more paper for each person a year?A.ChinaB.SwedenC.EgyptD.Japan40.What is the main idea of this short talk?A.More and more paper is being consumed nowadaysB.Paper enables people to receive education more easilyC.The invention of paper is of great significance to manD.Paper contributes a lot to the keeping of historical recordsPassage ThreeThere are three kinds of goals: short-term,medium-range and long-term goals.Short-range goals are those that usually deal with current activities,which we can apply on a daily basis.Such goals can be achieved in a week or less,or two weeks,or possible months.It should be remembered that just as a building is no stronger than its foundation ,out long-term goals cannot amount to very munch without the achievement of solid short-term goals.Upon completing our short-term goals,we should date the occasion and then add new short-term goals that will build on those that have been completed.The intermediate goals bukld on the foundation of the short-range goals.They might deal with just one term of school or the entire school year,or they could even extend for several years.Any time you move a step at a time,you should never allow yourself to become discouraged or overwhelmed. As you complete each step,you will enforce the belief in your ability to grow adn succeed.And as your list of completion dates grow,your motivation and desire will increase.Long-range goals may be related to our dreams of the future. They might cover five years or more. Life is not a static thing.We should never allow a long-term goal to limit us or our course of action.41.Our long-term goals mean a lot__.A. if we complete our short-range goalsB . if we cannot reach solid short-term goalsC .if we write down the datesD .if we put forward some plans42.New short-term goals are bulid upon__.A.two yearsB .long-term goalsC .current activitiesD .the goals that have been completed43.When we complete each step of our goals ,__.A.we will win final successB .we are overwhelmedC .we should build up confidence of successD .we should strong desire for setting new goals44.Once our goals are drawn up,__.A.we should stick to them until we complete themB.we may change our goals as we have new ideas and opportunitiesC .we had better wait for the exciting news of successD .we have made great decision45.It is implied but not stated in the passage that ___.A.those who habe long-term goals will succeedB .writing down the dates may discourage youC .the goal is only a guide for us to reach our desinationD .every should have a goalPassage FourThe economy of the United states after 1952 was the econnomy of a well-fed,almost fully employed people.Despit occasional alarms, the country escaped any postwar depression and lived in a state of boom. A n economic survey of the year 1955, a typical ye ar of the 1950’s, may be typical as illustrating the rapid economic growth of the decade. The national output was value at 10 percent above that of 1954 (1955 output was estimated at 392 billion dollars). The production of manufacturers was about 40 percent more than it had averaged in the years immediately following World War 2. The country’s business spent about 30billion dollars for new factories and machinery.National income available for spending was almost a third greater than it had been it had been in 1950. Consumers spent about 256 billion dollars; that is about 700 million dollars a day ,or about twenty-five million dollars every hour , all round the clock. Sixty-five million people held jobs and only a little more than two million wanted jobs but could not find them . Only agriculture complained that it was not sharing in the room. To some observers this was an ominous echo of the mid-1920’s . As farmer’s shre of their products declined , marketing costs rose. But there were , among the observers of the national economy, a few who were not as confident as the majority . Those few seemed to fear that the boom could not last and would eventually lead to the oppsite-depression.46. What is the best title of the passage?A. The Agriculatural Trends of 1950’sB . The Unemployment Rate of 1950’sC . U.S. Economy in the 50’sD . The Federal Budget of 195247. In Line 4 , the word “boom” could best be replaced by______.A. nearby explosionB . thunderous noiseC . general public supportD . rapid economic growth48. It can be inferred the national from the passage that most people in the United States in 1955 viewed thenational economy with an air of _________.A. confidenceB . confusionC . disappointmentD . suspicion49. Which of the following were LEAST satisfied with the national economy in the 1950’s?A. EconomistsB . FrmaersC . PoliticiansD . Steelworkers50. The passage states that incom available for spending in the U.S. was greater in 1955 than in 1950 . How muchwas it ?A. 60%B . 50%C . 33%D . 90%Part IV Translation (每题2分，共20分)Section A (每题2分，共10分)Directions: Translate the following sentences into Chinese. Write your answers on the Answer Sheet.51.The world won’t end if you don’t pass a test, so don’t worry excessively about a single test.52.From the second floor flat she could see the postman when he came down the street, and the little boy from the ground floor brought up her letters on the rare occasions when anything came.53. Few pastimes bring a family closer together than gathering around and listening to mother or father read a good story54.In our age, people depend more and more on puters to solve various kinds of difficult problems.55. That magazine story, and the person who wrote it, I have never been able to track down.Section B (每题2分，共10分)Directions: Translate the following sentences into English. Write your answers on the Answer Sheet56.The company denied that its donations had a . (商业目的)cation is (最看重的传统) in our family. That’s why my parents never took me to dinner at expensive restaurants, but sent me to the best private school.58.Shortly after he recovered from the surgery, he lost his job and thus had to gothrough . (人生的又一个困难阶段)59. (与...相比) our affluent neighbors, my parents are rather poor, but they have always tried to meet minimal needs.60. The curtains of the room are (风格不太协调) the style of the furniture.Part V Writing (共10分)Directions:For this part, you are allowed 30 minutes to write a letter. You should write no less than 100 words and you should base your composition on the outline (given in Chinese) below:1.告诉对方你将参加英语四级考试。
电气工程及其自动化专业英语苏小林
电气工程及其自动化专业英语-ZOE Su1. Introduction电气工程及其自动化( Electrical Engineering and Automation)是一个广泛应用于各个领域的学科，它涵盖了电力系统、电子电路、自动控制、仪器测量等多个方面。
在学习和研究这门学科时，熟悉相关的英语专业术语是非常重要的。
本文档将介绍一些电气工程及其自动化专业中常用的英语词汇和短语。
2. Electrical Engineering 英语词汇2.1 电力系统•Power system: 电力系统•Power generation: 发电•Power transmission: 输电•Power distribution: 配电•Power plant: 发电厂•Substation: 变电站•Transformer: 变压器•Generator: 发电机•Transmission line: 输电线路•Circuit breaker: 断路器•Load: 负载2.2 电子电路•Circuit: 电路•Resistor: 电阻器•Capacitor: 电容器•Inductor: 电感器•Diode: 二极管•Transistor: 晶体管•Integrated circuit (IC): 集成电路•Printed circuit board (PCB): 印制电路板•Voltage: 电压•Current: 电流2.3 自动控制•Control system: 控制系统•Feedback: 反馈•PID controller: 比例积分微分（PID）控制器•Sensor: 传感器•Actuator: 执行器•Control signal: 控制信号•Closed-loop control: 闭环控制•Open-loop control: 开环控制2.4 仪器测量•Instrumentation: 仪器测量•Measurement: 测量•Accuracy: 精度•Calibration: 校准•Sensor: 传感器•Meter: 仪表•Voltmeter: 电压计•Ammeter: 电流计•Oscilloscope: 示波器•Multimeter: 电表3. Electrical Engineering 英语短语3.1 电力系统•Power blackout: 停电•Grid integration: 网络集成•Load shedding: 负荷调节•Power factor: 功率因数•Power outage: 断电•Voltage regulation: 电压调节•Renewable energy: 可再生能源•Power factor correction: 功率因数校正•Power supply: 电源3.2 电子电路•Logic gate: 逻辑门•Circuit design: 电路设计•Printed circuit board (PCB) design: 印刷电路板设计•Analog circuit: 模拟电路•Digital circuit: 数字电路•Circuit analysis: 电路分析•Circuit simulation: 电路仿真•Circuit board layout: 电路板布局•Electronic component: 电子元件•Circuit diagram: 电路图3.3 自动控制•Automatic control: 自动控制•Control loop: 控制回路•Feedback loop: 反馈回路•Control system design: 控制系统设计•Proportional control: 比例控制•Integral control: 积分控制•Derivative control: 微分控制•Control algorithm: 控制算法•System response: 系统响应•Setpoint: 设定值3.4 仪器测量•Measurement uncertainty: 测量不确定性•Precision measurement: 精密测量•Measurement accuracy: 测量准确性•Metrology: 计量学•Calibration procedure: 校准程序•Test equipment: 测试设备•Instrument calibration: 仪器校准•Measurement range: 测量范围•Measurement error: 测量误差•Data acquisition: 数据采集4. 总结掌握电气工程及其自动化专业中的英语词汇和短语是很有必要的，它可以帮助我们更好地理解和交流相关知识。
电气工程及其自动化专业英语期末复习资料整理
This simple circuit made up of a source,a load and two wires is seldom,if ever,met with in practice.Practical circuits may contain a large number of sources and loads interconnected in a variety of ways.这种由一个电源、一个负载和两根导线组成的简单电路，在实践中即使能碰到也是很少见的。
实际电路可能包括许多按不同方式连接的电源和负载。
The direction of current flow may be shown either by a hollow arrowhead or by supplying the current symbol with a double subscript whose first digit identifies the junction at a higher potential and the second (省略了identifies) the junction at a lower potential.电流的方向既可用一个空心箭头来表示，又可用带有双下标的电流符号来表示，且第一个下标认定为高电位点，第二个下标为低电位点。
In a potential-distribution diagram it is represented(on a suitable scale)by the slope of the respective curve at any point,the slope being defined as the tangent of the angle that the line tangent to the curve at that point make with the x-axis.在电势分布图中，电流由曲线上该点相应的斜率表示，斜率定义为切线与x 坐标轴夹角的正切。
电气工程及其自动化专业英语期末复习资料整理(单词)
circuit components 电路元件the dielectric 电解质circuit parameters 电路参数storage battery 蓄电池electrical device 电气设备wire导线electric energy 电能 e.m.f.=electromotive force 电动势energy source 电源unidirectional current 单方向电流primary cell 原生电池circuit diagram 电路图secondary cell 再生电池load characteristic 负载特性energy converter 电能转换器terminal voltage 端电压conductor 导体external characteristic 外特性generator 发电机load resistance 负载电阻heating appliance电热器voltage drop 电压降direct-current （D.C.）circuit 直流电路conductance电导magnetic and electric field 电磁场volt-ampere characteristic 伏-安特性time-invariant时不变的metal-filament lamp 金属丝灯泡self-（or mutual-）induction 自（互）感carbon-filament lamp 碳丝灯泡displacement current位移电流non-linear characteristic非线性特性part 1-unit 2ideal source理想电源ideal current source 理想电流源series and parallel equivalent circuit串并联等值电路active circuit elements 有源电路元件internal resistance 内阻passive circuit elements 无源电路元件sending end 发送端power transmission line 输电线double subscript 双下标receiving end 接收端ideal voltage source理想电压源lackage current漏电流part 1-unit 3Ohm’s law 欧姆定律active branch有源支路circuit branch 支路positive reference direction 正（参考）方向reference point 参考点potential distribution电位分布passive element 无源元件single-loop network （circuit ）单回路网络（电路）complex circuit 复杂电路 D.C. machine直流电机P.D.=potential drop电压降part 1-unit 4r.m.s values=root of mean sguare 均方根complex number 复数effective values 有效值Cartesian coordinates 笛卡尔坐标系steady direct current 恒稳直流电counter-clockwise 逆时针方向sinusoidal time function 正弦时间函数vector diagrams 矢量图clockwise顺时针方向complex plane复平面trigonometric transformations 三角转换vector of voltages （currents ，magnetic ，fluxes ）电压（电流，磁通等）矢量Argand 阿尔冈，法国数学家analytical solution 解析法absolute value 绝对值Argand diagram 阿尔冈图modulus复数模origin of coordinates 坐标原点complex time function 复数的幅值rotating vector 旋转矢量real part 复数实部instantaneous values 瞬时值imaginary part复数虚部epoch angle初相角301&302吐血整理男生版专业英语单词part 1-unit 1complex-number method=method复数法phase displacement相位差of complex numbersvector矢量constant angular velocity恒定角速度Part 1-unit 5small signal amplifier小信号放大器isolation隔离。
电气工程及其自动化专业英语复习资料
1.目前，煤仍然是凝汽式电厂最长用的能源。
At present coal is the most mon food of a steam power plant.2.为防止人畜触电，高压电一般采用架空线输送。
High voltage current is usually carried by overhead wire system so as to prevent living things being electrocuted.3.这座由电子计算机控制的核电站将向全市供电。
This nuclear power plant which is puter-controlled will serve the entire city. 4.电学与电子学实际上是唯一难以分开的，二者相互渗透，相互联系。
Electricity and electronics are really indivisible, each forming part of the other.5.元件技术中起主要作用的是半导体元件。
The major contributors in ponent technology have been in the sosemiconductor ponents.6.电压，电流和电阻这三个因素是相互关联的。
The factors, voltage, current and resistance , are related to each other .7.电动机与发电机就是以磁和电这二者之间的关系为根底的Based upon the relationship between magnetism and electricity are motors and generators8，随着电气工程学的开展，电力能被输送到非常遥远的地方去。
With the development of electrical engineering , power can be transmitted over long distance.9每时每刻，能量都在由一种形式变成另一种形式。
电气工程专业英语复习资料
1、One type of electrical circuit is referred to as a series circuit. In a series circuit, there is only one path for current to flow. Since there is only one current path , the current flow is the same value in any part of the circuit. The voltages in the circuit depend on the resistance of the components in the circuit.（一个典型的电路称为串联电路。
在串联电路中，只能有一个电流流动的路径。
因此一个电流路径的电流流动，同时也是同一个电流值在其他部分的电路流动。
该电路中电压依赖电阻来改变的。
）2、When an AC source is connected to some type of load (当交流电源连接到某种类型的负荷),current direction （方向）changes several times in a given unit of time（给定时间）.交流电流的特点3、A circuit that employs a numerical signal (数字信号)in its operation is classified as a digital circuit. 数字电路定义4、When a NOT gate is combined with an AND gate or an OR gate, it is called a combination logic gate. A NOT-AND gate is called a NAND gate, which is an inverted AND gate. Mathmatically, the operation of a NAND gate is A*B=C. A combination NOT-OR, or OR, gate produces a negation of the OR function. Mathmatically the operation of a NOT gate is A+B=C. A1 appears at the output only when A is 0and B is 0.（当一个非门与与门或者一个或门结合，就称它为组合逻辑门。
电气工程专业英语复习资料只是分享
1、One type of electrical circuit is referred to as a series circuit. In a series circuit, there is only one path for current to flow. Since there is only one current path , the current flow is the same value in any part of the circuit. The voltages in the circuit depend on the resistance of the components in the circuit.（一个典型的电路称为串联电路。
在串联电路中，只能有一个电流流动的路径。
因此一个电流路径的电流流动，同时也是同一个电流值在其他部分的电路流动。
该电路中电压依赖电阻来改变的。
）2、When an AC source is connected to some type of load (当交流电源连接到某种类型的负荷),current direction （方向）changes several times in a given unit of time（给定时间）.交流电流的特点3、A circuit that employs a numerical signal (数字信号)in its operation is classified as a digital circuit. 数字电路定义4、When a NOT gate is combined with an AND gate or an OR gate, it is called a combination logic gate. A NOT-AND gate is called a NAND gate, which is an inverted AND gate. Mathmatically, the operation of a NAND gate is A*B=C. A combination NOT-OR, or OR, gate produces a negation of the OR function. Mathmatically the operation of a NOT gate is A+B=C. A1 appears at the output only when A is 0and B is 0.（当一个非门与与门或者一个或门结合，就称它为组合逻辑门。
电气工程及其自动化-自动化-专业英语重点-考试题
四川理工的学弟学妹们，特别是自电学院的兄弟伙们，专业英语难过啊，是否需要这个呢？我的淘宝店铺：信诚悦购包你80分电气自动化、自动化专业英语课堂笔记一．短语互译（10个，每个2分，共20分）1、DC/AC：direct/alternating current.(直流/交流)2、a good rule of thumb.（根据经验）3、step-up/step-down transformer(升压/降压变压器）autotransformer(自耦变压器)4、gate-turn-off thyristor [θai'ristə](门极可关断晶闸管）5、silicon-controlled rectifier(可控硅整流器）6、forward voltage drop(正向压降)7、reverse breakdown voltage(反向击穿电压）8、reverse leakage current（反向漏电流）9、peak reverse voltage（反向峰值电压）10、forced commutation(强制换流）11、three-phase ac squirrel cage induction motor（三相交流鼠笼式感应电机）12、AM/FM :amplitude/frequency modulation(调幅/调频)13、active/passive filter（有源/无源滤波器）14、bistable circuit(双稳电路)15、flip-flop（触发器）16、emf：electromotive [i,lektrəu'məutiv] force(电动势)17、magnetic flux（磁通）18、magnetizing current（磁化电流/励磁电流）19、general-purpose relay（通用继电器）20、solid-state relay(固态继电器)21、time constant（时间常数）22、ADC：analog-to-digital conversion （模数转换器）二、汉译英（5-6个，共30分，2个课外）1、通过互联网进行商业交易，其便利性和速度是推动电子商品快速发展的主要因素。
电气工程及其自动化专业英语词汇复习
the second fingers 中指
4. slip 转差
rotor 转子
stator 定子
5. exciting voltage 励磁电压
6. electrical steel 电工钢
7. laminated core 叠片芯
8. squirrel cage 鼠笼
9. cast-aluminum 铸铝
14
1 Key words-Chapter 6
1. incandescent lamp 白炽灯
2. electric utility industry 电力工业
3. high voltage DC (HVDC) 高电压直流
4. primary energy 一次能源
5. fossil 化石燃料
nuclear 核能
10. voltage divider 分压器
4
1 Key words-Chapter 2
11. clock pulse 时钟脉冲
12. time interval 时间间隔
13. a relative term 相对量
14. reference voltage source 参考电压源
15. a weighted value 加权值
9
1 Key words-Chapter 4
10. random-wound 散绕
11. form-wound 模绕 13. ferromagnegnetic flux 磁通
15. primary winding 一次绕组,初次绕组
16. secondary winding 二次绕组
primary voltage 一次侧电压
27. copper losses 铜耗
电气工程及其自动化专业英语
电气工程及其自动化专业英语第一篇：电气工程及其自动化专业英语电气工程及其自动化专业英语老师：学生:专业：电气工程及其自动化学院：学号：Automatic Control system自动控制系统When a specific systemis proposed for a given application,it mustsatisfy certain requirements.This may involve the system response or optimization of the system in a specified way.These requirements that a control system must meet are generally called performance specifications.当一个精细的系统被推引入一个给定的应用程序的时候，它必须满足这个特定的要求。
这个可能包括系统响应或者系统精细方法的最佳组合。
一般把这些一个系统必须处理的要求叫做性能指标。
The performance that of a control system can be considered in three parts.The first part pertains to the specification as they directly relate to system response.The second has to do with a performance index that is a functionof the erroror output.The last part is concerned with system error caused by parameter variations.一个控制系统的性能可以从三个部分来考虑。
第一个部分涉及到的规格直接和系统响应有关。
aps-电气复习final英文资料
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电气工程专业英语+unit6资料
Note：①that applies a control signal to the plant为定语从句，修饰the agency。
adj. 手动的 adj. 智能的 相互依存的元件 n. 激励 恒温控制 n. 副翼 n. 方向舵 整流罩
6.1 Introduction
6.1.1 Elementary Concept of Control Systems
text
A control system is an interrelated collection of elements that directs or regulates (controls) energy or exerts restraint, from a source point to a usage point. To be acceptable①, it must have physical properties and performance characteristics that satisfy all concerned observers. Physical properties can be peculiar to an application, and they are usually subject to② economic constraints presenting their own challenge to the designer. However, different physical systems have performance similarities that logically lead to a unified control-system theory.
电气专业英语第三版期末考试要点
电气专业英语第三版期末考试要点第一部分：基础知识1. 电气工程概念•了解电气工程的定义和目标•理解电气工程在现代社会中的应用2. 电路基础•掌握电路的基本概念，例如电流、电压、电阻、功率等•理解基本电路定律，如欧姆定律、基尔霍夫定律等•熟悉常见电路的符号表示和电路图的绘制3. 电气设备•了解各种电气设备的功能和应用领域•掌握电气设备的分类和特性•熟悉电气设备的常见故障和维修方法4. 电力系统•理解电力系统的组成和运行原理•掌握电力系统的分类和结构•了解电力系统的调度和控制方法第二部分：专业术语1. 电气工程术语•掌握电气工程中常用的英文术语和缩写•理解这些术语在电气工程中的具体含义和应用2. 电路术语•熟悉电路中常见的英文术语和表达方式•理解这些术语在电路分析和设计中的作用和意义3. 电力系统术语•掌握电力系统领域中常用的术语和表达方式•理解这些术语在电力系统规划、运行和维护中的应用4. 电气设备术语•了解各类电气设备中常见的英文术语和名称•掌握这些术语对应的设备功能和特性第三部分：实际应用1. 电气工程实践•掌握电气工程实践中的基本流程和方法•理解电气工程实践中的安全考虑和规范要求2. 电路设计与分析•掌握电路设计和分析中的常用方法和工具•理解电路设计中的性能指标和约束条件3. 电力系统规划与管理•了解电力系统规划和管理中的原则和方法•掌握电力系统调度和控制的基本技术4. 电气设备维护与故障排除•熟悉电气设备维护和故障排除的基本流程•掌握常见电气设备故障的诊断和修复方法第四部分：应试技巧1. 考试准备•合理安排复习时间，掌握复习方法和技巧•制定详细的学习计划，包括每个知识点的复习进度2. 考试技巧•注意题目要求，审题准确，选择合适的解题方法•合理安排答题时间，避免过度拖延或过于匆忙3. 答题技巧•使用清晰的语言和逻辑结构来回答问题•对于计算题，注意单位的转换和计算公式的正确应用4. 复习总结•及时总结复习过程中的不足和错误，进行巩固和补充•根据自身情况，进行有针对性的复习和强化训练以上是电气专业英语第三版期末考试的要点，掌握了这些基础知识、专业术语，了解其实际应用，以及合理的应试技巧，相信同学们在考试中会有更好的表现。
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This simple circuit made up of a source,a load and two wires is seldom,if ever,met with inpractice.Practical circuits may contain a large number of sources and loads interconnected in a variety of ways.这种由一个电源、一个负载和两根导线组成的简单电路，在实践中即使能碰到也是很少见的。
实际电路可能包括许多按不同方式连接的电源和负载。
The direct ion of curre nt flow may be show n either by a hollow arrowhead or by suppl ying the curre nt symbol with a double subscript whose first digit identifies the junction at a higher potential and the second 省略了identifies) the junction at a lower potential.电流的方向既可用一个空心箭头来表示，又可用带有双下标的电流符号来表示，且第一个下标认定为高电位点，第二个下标为低电位点。
In a pote ntial-distributi on diagram it is represe nted( on a suitable scale)by the slope of the respective curve at any poi nt,the slope bei ng defi ned as the tangent of the angle that the line tangent to the curve at that point make with the x-axis.在电势分布图中，电流由曲线上该点相应的斜率表示，斜率定义为切线与x坐标轴夹角的正切。
It follow that the r.m.s.(effective) value of an alternating current is numerically equal to the magnitude of the steady direct curre nt that would produce the same heat ing effect in the same resista nee and over the same period of time.由此得出：交流电流的均方根(有效值)大小上等于在相同电阻上和同一时间内产生相同的热效应的恒稳直流电流。
The operational voltage amplifier is representedschematically by the triangular symbol .AO is the voltage gain from differe ntial in put to sin gle-e ndrd output and is always a positive nu mber . Phase reversals are taken into account at the in put termi nal，which is the reas on why these are labeled ” +” andThe voltage at each terminal，including the output ,may be referred to common reference ,usually ground ,and uni ess otherwise stated ,this com mon refere nee will be assumed . Thus ,lett ing V(+) represe nt the voltage of the positive in put term inal with respect to the com mon refere nee ,and V(-),that of the n egative in put term inal ,we may defi ne the differential input voltage as V二V( ) -V (-) ,and the output voltage is V0 = A0V id.电压运算放大器可用三角形符号来表示。
A0表示从差动输入端到单一输出端的电压增益，并恒为正值。
考虑到在输入端可能会有反相输入的情况，所以要标上“ +号与号。
每个端口包括端口的输出端口的电压，都可以选一个共同的参考点，通常选大地，除非另有说明，否则所假定的参考点就是地。
这样，用V(+)代表正向输入端对参考点的电压，而V(-)则代表负向输入端对参考点的电压，我们可以将差动输入电压定义为％二V「)-V(-)，输出电aa压V。
二Ay。
The significance of this result is that the terminal voltage gain ,which is the usable voltage gain , is in depe ndent of the parameters of the amplifier ,and depe nds only on the exter nal comp onent R1 and这个结论的意义在于端电压增益(这是很有用的电压增益)与放大器的参数无关，而只取决于外部元件R1和R2。
A truth table is a list of all of the possible in put variable state combinations of a circuit listed in binary-sequential order with the corresponding output state for each combination listed in an adjace nt colu mn. Tablei shows the binary nu mbera corresponding to the decimal nu mbers from zero to fiftee n.真值表是这样的一个表格，电路中可能输入的所有不同状态组合按二进制顺序连续排列，输出状态与输入端的每种组合--- 对应，表1表示了与十进制0~15 ------------ 对应的二进制数。
The truth table is used as the begi nning point in desig ning or an alyz ing a logic circuit The sequential listing makes it easy to recog nize if any in put comb in ati ons were missed. It is made up of either from the problem specificati ons or by seque ntial testi ng of an assembled circuit. A logic equati on can be formulated from the truth table and a logic circuit can be developed from the equation. Truth tables areused in defining the basic AND,OR and NOT functions below在设计或分析一个逻辑电路时，首先要列写真值表。
这种连续的表格很容易辨认出是否遗漏了任何一种组合，她可有问题的具体情况或对一集成电路进行连续测试来建立。
由真值表可建立逻辑等式，由此等式就可构造一逻辑电路。
在下面定义基本逻辑与”、或”和非”的函数中就用到了真值表。
The logic AND fun cti on can be expa nded to any nu mber of in puts ,simply by appl yin gthe basic defi niti on. Thus a 5-i nput logic AND gate will produce an output only if the in put comb in atio nABCDE=11111 exists,and providing the physical circuit will still function properly with that many in put attached.只要运用基本定义，逻辑与函数便可扩展到任意一个输入。
因此一个五输入的逻辑与门只有在ABCDE=11111且具体电路与那些连接的输入量有恰当的函数关系时才等于一。
Today moti on con trol is an area of tech no logy that embraces many diverse discipli nes,such as electrical mach in es,power semic on ductor devices, conv erter circuits,dedicated hardware sig nal electronics,control theory,and microcomputers,more recently,t he advent of VLSI/ULSI circuits and sophisticated computer-aided desig n tech niq ues has added nel imen sio ns to the tech no logy.当今世界的运动控制是这么一个综合性的技术领域，其包括诸如电机、电力半导体装置、转换器电路、专门的硬件信号电子学、控制理论、微型计算机等方方面面的众多技术领域。
最近出现的超大规模集成电路，甚至特大规模集成电路，再加上日渐程序的计算机辅助设计技术出现，又进一步拓宽了运动控制技术领域新的运用范围。
Mechanical motion control systemS ound widespread acceptanee in industry since the invention of the steam engine started the first in dustrial revoluti on in eightee nth cen tury,whe n mass in dustry manu facturi ng replaced manu al labor.18世纪蒸汽机的发明开启了第一次工业革命，当时大规模的工业生产化代替了手工劳动，从此以后，运动机械的运动控制系统便在工业领域得到广泛地应用。