电工学双语第一章作业

1-1.All resistors in Figure 1–1 are 15 ⍀
. For each case,determine the magnitude and polarity of voltage V .V I
(a) I = 3 A V (b) I ϭ −4 A
ϩϪV (c) I = 6 A
(d) I = −7 A
ϩϪϩϪI
Ϫ
3 V V 2
(b)
ϩ10 V V 1
(a)
FIGURE 1–2
FIGURE 1–1
1-2 Determine the unknown voltages in the networks of Figure 1–2
FIGURE 1–3
Determine the unknown voltages in the networks of Figure 1–3.
1-3 .(a)
V 12(b)
2 V V 2V Chapter 1 homework
FIGURE 1-6
1-6.Determine the total resistance of the networks shown in Figure 1–6.
FIGURE 1–5
Solve for the unknown voltages in the circuit of Figure 1–5.
1-5.FIGURE 1–4
Solve for the unknown voltages in the circuit of Figure 1–4.
1-4.
2
R 3V
3
P 3 = 36 W
10 V
R
V 3
2
2 k ⍀
R T
(a)
580 k ⍀
R T
(b)R T
(c)
Each resistor band code is
orange, white, red
FIGURE 1–7
1-7.Determine the unknown resistance in each of the networks in Figure 1–7.
R
R R
T
(a)
R T
(b) Each resistor band code is
brown, red, orange
R (c)
R 2
R T = 36
1-9.The circuits of Figure 1–9 have the total resistance,FIGURE 1–8
1-8.For the circuits shown in Figure 1–8,determine the total resistance,R T ,
and the current,I.
(a) Circuit 1
R 2 = 400 ⍀
R 3 = 1 k ⍀
R
= 200 ⍀
4E E = 300 V
2.2 k ⍀
(b) Circuit 2
R T ,as shown. For each
of the circuits find the following:
a.The magnitude of current in the circuit.
b.The total power delivered by the voltage source.
c.The direction of current through each resistor in the circuit.
d.The value of the unknown resistance,R.
e.The voltage drop across each resistor.
FIGURE 1–9
E = 90 V R T = 12 k ⍀
1 k ⍀
4 k ⍀
(a) Circuit 1
E = 25 V R T = 800 ⍀
100 ⍀
300 ⍀
150 ⍀
R (b) Circuit 2
FIGURE 1–10
1-10.For the circuit of Figure 1–10,find the following quantities:
a.The current,
I .
b.The voltage drop across each resistor.
c.The voltage across the open terminals a and b.
R 2 = 100 ⍀R R 3 4 V
FIGURE 1–131-13.Given the circuits of Figure 1–13:
FIGURE 1–12
1-12.For the circuits of Figure 1–12,determine the voltage across each resistor
FIGURE 1–11
1-11.Refer to the circuit of Figure 1-11:
e Kirchhoff’s voltage law to find the voltage drops across R 2and R 3.
b.Determine the magnitude of the current,I .
c.Solve for the unknown resistance,R 1.
R 1
2 2.2 V R 3
and calculate the voltage V a .
54 V
⍀
(a)
(b)
(a)
(b)
V b = Ϫ2 V V c = ϩ
6 V
a.Determine the voltage across each resistor.
b.Find the magnitude and direction of the current in the 180-k ⍀resistor.
c.Solve for the voltage V a .
FIGURE 1–16
1-16.Find each of the unknown currents in the networks of Figure 1-16.
FIGURE 1–15
1-15.Consider the network of Figure 1–15:FIGURE 1–14
e Kirchhoff’s current law to determine the magnitudes and directions of the indicated currents in each of the networks shown in Figure 1–14.
(a)
2
(b)
6 A
1 A
(c)
a.Calculate the currents I 1,I 2,I 3,and I 4.
b.
Determine the value of the resistance R 3.
R 3
(a)
(b)
I
FIGURE 1–19
1-19.For the circuit of Figure 1–19,determine each of the indicated currents. If
FIGURE 1–18
1-18.Refer to the circuit of Figure 1–18.
FIGURE 1–17
Figure 1–17.
e the current divider rule to find the currents I 1and I 2in the networks of
(a)
⍀
2(b)
R
1 = 3 k ⍀
I 2
a.Solve for the indicated currents.
b.Find the power dissipated by each resistor.
c.Verify that the power delivered by the voltage source is equal to the total power dissipated by the resistors.
I the circuit has a 15-A fuse as shown,is the current enough to cause the fuse to open?
I R 348 ⍀。