ω=5,U=120√2u=U∠0电阻:电流与电压同相位,i1=120√2/15∠0=8√2∠0电感:L=4H,阻抗=ωL=20Ω,电流滞后90°i2=120√2/20∠-π/2=6√2∠-π/2电容:C=0.02F,容抗=1/ωC=1/(5×0.02)=10Ω,i3=120√2/10∠π/2=12√2∠π/2i2十i3=6√2∠π/2(反向)i1十i2十i3=√2√(8²十6²)∠arctan(6/8)=10√2∠arctan(3/4)