Q. In an ac circuit with voltage $V$ and current $I$, the power dissipated is
A) $VI$
B) $\frac{1}{2}VI$
C) $\frac{1}{\sqrt{2}}VI$
D) Depends on the phases between $V$ and $I$
Explanation
(d) $\because P = Vi\cos\phi,\ \therefore P \propto \cos\phi$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.