考点一、欧姆定律在串联电路中的应用


 

(1)电流:I=I2=I1;

(2)电压:U=U1+U2;

(3)电阻:R=R1+R2;

(4)分压规律:U1/U2=R1/R2.

考点二、欧姆定律在并联电路中的应用

(1)电流:I=I1+I2;

(2)电压:U=U1=U2;

(3)电阻:1/R=1/R1+1/R2;

(4)分流规律:I1/I2=R1/R2.