Question

What is the average power dissipation in an ideal capacitor in an AC circuit?

• A. $2C{V}^2$
• B. $\frac{1}{2}C{V}^2$
• C. zero
• D. $C{V}^2$

Answer 1

Answer: (C)

Average power in AC circuits is given by $P=V_{rms}{I}_{rms}cos\varphi$ . For a purely capacitive circuit, $\varphi =90^{\circ }$ so, $P=0$ .