《电压》电压电阻免费课件-人教版九年级物理全册PPT课件

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第1节电压
3.电压的国际单位是___伏__特___,
简称__伏____,
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1.电压是形成___电__流___的原因, 即电压使电路中的自由电荷 发生______定_向__移_动__形成电流, ___电_源____是提供电压的装置, 电压用字母____U____表示。
2.电路中要获得持续电流的条件是:电路中要有___电_源__(或电 路两端有_____电_压__), 并且电路是___闭_合____的。
用符号 V
______表示, 此外, 常用的单千伏位(还kV)有___毫__伏_(_m_V)、________。
4.完成下列单位换算。
(1)48 V=__0_._0_4_8__kV=_4_._8_×__10_4_mV; (2)22 V=__0_.__0_22__kV; (3)350 kV=3_._5_×__1_05___V。
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第十六章电压电阻
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第1节电压
第1节电压
A知识要点分类练
知识点 1电压
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第1节电压
5.正确填写下面几个特殊的电压值。
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