分流电路：I=I1+I2 I1=U/R1 I2=U/R2 I=U(1/R+1/R2)=U*(R1+R2)/R1*R2即：U=I*R1R2/(R+R2) 代入I1=U/R1 得I1=I*R2/(R1+R2 ) 将U=I*R1R2/(R+R2) 代入I2=U/R2得：I2=I*R1/(R1+R2)分压电路：U=U1+U2 U1=I*R1 U2=I*R2 U=I(...