串联,各部件电流一样:u总=U1+U2 IxR总=IxR1+IxR2
并联,各部件电压一样:I总=I1+I2 U/R总=U/R1+U/R2
并联电流之比:u一样 I1=U/R1 I2=U/R2 ->U=I1xR1,U=I2xR2 ->I1xR1 = I2xR2
I1/I2=R2/R1.
串联,各部件电流一样:u总=U1+U2 IxR总=IxR1+IxR2
并联,各部件电压一样:I总=I1+I2 U/R总=U/R1+U/R2
并联电流之比:u一样 I1=U/R1 I2=U/R2 ->U=I1xR1,U=I2xR2 ->I1xR1 = I2xR2
I1/I2=R2/R1.