P=P1+P2=60+100=160W I=P/U=160/220=0.73A
1/R=1/R1+1/R2+1/R3=1/1+1/2+1/0.5=3.5 R=1/3.5=0.286Ω
Q=I2Rt=52*0.6*3600=54000焦耳