v(t)=200sin(300t+30°)V
V=200/√2 = 100√2
P =IVcosθ = 4000 = S*cosθ = S*0.8
S=5000, Q = 3000
3000=V*V/XL= 100√2* 100√2/XL = 100√2* 100√2*wC
3000=20000*wC =20000*300*C
C = 3000/300*20000=10/20000=0.0005F=500uF
22.有一單相交流電路,電源電壓為 v(t)=200sin(300t+30°)V..-阿摩線上測驗