Question

For an ac circuit $I = 20 \cos \omega t$ the average power consumed in this circuit is

• A. 300 Watt
• B. 150 Watt
• C. 75 Watt
• D. Zero

Answer 1

Answer: (D)

Zero

Answer 2

$P = V _ { r m s } I _ { r m s } \cos \phi$; since $\phi = 90 ^ { \circ }$. So P = 0