Q 12-03-041NEETJEE MainEasy
A $100$ W, $220$ V bulb is operated on a $110$ V supply. The power it consumes is
Answer: (B) $25$ W
$R = \dfrac{V^2}{P}$ is fixed, so $P \propto V^2$: $100 \times \left(\dfrac{1}{2}\right)^2 = 25$ W.
Solution by Sreeraj P, M.Sc Physics