Alternating Current Test

Result

Alternating Current Test - 8

Score
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Question 1
1 / -0

A circuit containing a 80 mH inductor and a 60 μF capacitor in series is connected to a 230 V, 50 Hz supply. The resistance of the circuit is negligible. Average powers transferred to the inductor and to the capacitor are respectively

A
10 W, 10 W

B
20 W, 10 W

C
10 W, 20 W

D
0 W, 0 W

Solution

P = VI cos ϕ

Average power consumed by inductor is zero as actual voltage leads the current by π/2 and (cos⁡ π/2 = 0).

Average power consumed by capacitor is zero as actual voltage lags the current by π/2 and (cos π/2 = 0).