已知通过三个并联支路的电流之比是I1∶I2∶I3=1∶2∶3,则三个并联

已知通过三个并联支路的电流之比是I1∶I2∶I3=1∶2∶3,则三个并联支路的电阻之比R1∶R2∶R3为(    )

A.1∶2∶3         B.3∶2∶1            C.2∶3∶6         D.6∶3∶2

答案

解析:在并联电路中,各部分电压都相等,电流的分配与各支路电阻成反比.所以有

R1∶R2=I2∶I1=2∶1;R2∶R3=I3∶I2=3∶2

写在一起应该是R1∶R2∶R3=6∶3∶2,D正确.

答案:D

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