在n个电阻的并联电路中:设电压为U;总电阻为R，分电阻为R1、R2······Rn;总电流为I，分电流为I1、I2······In则:
I=U/R1+U/R2+······+Rn
R=U/I
=U/(U/R1+U/R2+······+U/Rn)
=1/(1/R1+1/R2+······+1/Rn)
∴1/R=1/R1+1/R2+······1/Rn
或:
I=I1+I2+······+In
U/R=U/R1+U/R2+······+U/Rn
∴1/R=1/R1+1/R2+······+1/Rn
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