题目内容
如图所示电路,灯L1、L2、L3是三只规格不同的电灯,当开关S闭合时,电流表
、
、
的示数分别是I1、I2、I3,则( )
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A.I1=I2<I3 | B.I3>I2>I1 | C.I1>I2>I3 | D.I1=I2=I3 |
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由电路图可知,三个灯泡并联,电流表A1测干路电流,电流表A2测流过灯L1、L2的电流,电流表A3测流过灯L3的电流;
由并联电路电流规律可知:I3=IL3,I2=I3+IL2,I1=I2+I3+IL1,故I1>I2>I3,故C正确,ABD错误;
故选C.
由并联电路电流规律可知:I3=IL3,I2=I3+IL2,I1=I2+I3+IL1,故I1>I2>I3,故C正确,ABD错误;
故选C.
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