2.如【圖 11】所示,試求:(15 分)
串 =》並
R’= 12*2次 + 16*2次 /12 = 100/3
Xc’(XL’)=25
Y=1/30 + 3/300 + 1/j25 + 3/100 + 1/-j25
= 10/100 + 9/300 + 9/300
=28/300
Zth = 1/Y = 300/28
I=300*28/300=28
P=28*300=8400W
8400