V)=100 (A)=2A 电感线圈 (W)=120W f= 50Hz Find R and L P R =120/4=309 2 Z|==100/2=50 oL=√502-304=40 L=40/314=0.127H  −+ L •I R •V 电感线圈 V A W . 50 ( ) 120 ( ) 2 ( ) 100 Find R and L f Hz W W A A V V = === = = 120 / 4 = 30  2 IP R 50 30 40 2 2  L = − = | |= = 100/ 2 = 50 IV Z L = 40/ 314 = 0.127H (1)