电流：串联I=I1=I2并联I=I1+I2电压：串联U=U1+U2并联U=U1=U2电阻：串联R=R1+R2并联R=1/R1+1/R2=(R1R2)/(R1+R2) 当有：I=U/R,P=UI时P=U²/R R=U²/P U额²/U实²=P额/P实串联分压与电阻成正比：U1/U2...