(3)R-L串 L 联电路相 R 量式表示乙 U=UR+UL 设:Ⅰ=∠00U=RU iX/ R R L L UFUR+UL=I(R+JXL)=IZ z=R+X=2∠9Z复数阻抗=1∠9 2=√R2+X12Z称为复数阻抗的模 X p=tg φ阻抗角,电压领先电流的相位角(3)R-L串 联电路相 量式表示 U I UL UR R X t g Z R X Z R j X Z U U U I R j X IZ L L L R L L 1 2 2 ) − = = + = + = = + = + = ( R L I U UR UL Z复数阻抗 Z称为复数阻抗的模 阻抗角,电压领先电流的相位角 I = I0 设: = I Z U UR UL = + U R = I R U jX I L L =