Question

When an ac voltage of $220\,V$ is applied to the capacitor $C$, then

• A. the maximum voltage between plates is $220\,V$
• B. the current is in phase with the applied voltage
• C. the charge on the plate is not in phase with the applied voltage
• D. power delivered to the capacitor per cycle is zero

Answer 1

Answer: (D)

power delivered to the capacitor per cycle is zero

Answer 2

When an ac voltage of $220\,V$ is applied to a capacitor $C$, the charge on the plates is in phase with the applied voltage. As the circuit is pure capacitive so, the current developed leads the applied voltage by a phase angle of $90^?$ Hence, power delivered to the capacitor per cycle is $P=V_{rms}\,I_{rms}\,cos\,90^? = 0$.