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    14.素養(4)
A -20A
B 20A
C202 A
D 202 A

電流 i(t) 與電源電壓 v(t) 同相位 ⟹ 諧振

ω = 1/LC = 1/2

電感與電容扺消 Z = 5Ω

i(t)=1002 sin(ω t-45°) / 5 = 202 sin(ω t-45°)

i(4π)=202 sin( 12 × 4π-45°) = 202 sin(-45°) = 202 × -12 = -20 A


A 5
B 2
C 1.414
D 1

功率因數為 1,電路諧振

V = 50V

消耗的平均功率為 25W ⟹ R = 50225 = 100Ω

ω = 1;XC = 1ωC = 110m = 100Ω

Q = RXC0 = 100/100 = 1