Question

The current and voltage in AC circuit are given by $I=5\sin \left( 100t-\frac{\pi }{2} \right)A$ and $V=200\sin (100t)$ volt. The power dissipated in the circuit will be

• A. 20 W
• B. 40 W
• C. 1000 W
• D. zero

Answer 1

Answer: (D)

zero

Answer 2

$P={{E}_{rms}}\times {{i}_{rms}}\times \cos \phi$ $\phi =\frac{\pi }{2}$ $\cos \phi =0$ $P={{E}_{rms}}\times {{i}_{rms}}\times (0)=0$