Question

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

• A. $\frac { 1 } { 2 } C V ^ { 2 }$
• B. $C V ^ { 2 }$
• C. $\frac { 1 } { 4 } C V ^ { 2 }$
• D. Zero

Answer 1

Answer: (D)

Zero

Answer 2

Average power in ac circuits is given by

$P = V _ { r m s } i _ { r m s } \cos \phi$

For pure capacitive circuit $\phi = 90 ^ { \circ }$ so P = 0