5∠60° =0.149∠-3.4°A 33.54∠63.4 UR=RI=15×0.149∠-3.4°=2.235∠-3.4°V U=j0LI=56.5∠900×0.149-3.40=8.42∠86.4。V I=26.5∠-90°×0.149∠-3.4°=3.95∠-93.4°V oC 则i=0.1492c0ot-34)A U L ln=2235√2c0s(Ot-3.4°)V U l1=8.42√2cos(ot+866")V 3.4° 9 l=3952c0s(0t-934)V 注U1=842>U=5,分电压大于总电压。相量图A o o o 0.149 3.4 33.54 63.4 5 60 = −   = = • • Z U I 则 i = 0.149 2 cos(ωt − 3.4 o ) A UL=8.42>U=5，分电压大于总电压。 U  UL  UC  I UR    -3.4° 相量图 V o o = = 150.149− 3.4 = 2.235− 3.4 • • U R R I j V o o o = = 56.590 0.149− 3.4 = 8.4286.4 • • U L L I V C 1 j o o o = = 26.5− 90 0.149− 3.4 = 3.95− 93.4 • • UC I  2.235 2 cos( 3.4 ) V o uR = ω t − 8.42 2 cos( 86.6 ) V o uL = ω t + 3.95 2 cos( 93.4 ) V o uC = ω t − 注