First slide

Power in a.c. circuit

Question

The average power dissipation in a pure capacitor in AC circuit is

Easy

A

$\frac{1}{2} {CV}^{2}$
B

${CV}^{2}$
C

$\frac{1}{4} {CV}^{2}$
D

Zero

Solution

Average power in AC circuits is given by
$P = V_{rms} i_{rms} cosϕ$
For pure capacitive circuit, $ϕ = 90^{\circ}, so P = 0$

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