First slide

AC Circuits

Question

The average power dissipation in a pure capacitance in ac circuit is

Moderate

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 $φ = 90^{o}$ so P = 0

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