An electric bulb is rated 220 volt $-100$ watt. The power consumed by it when operated on 110 volt will be

An electric bulb is rated 220 volt $-100$ watt. The power consumed by it when operated on 110 volt will be
  1. 50 watt
  2. 75 watt
  3. 40 watt
  4. 25 watt

Solution

$\frac{V_1^2}{P_1}=\frac{V_2^2}{P_2}=$ Resistance $\Rightarrow P_2=25 \mathrm{~W}$

Asked in: JEE Main 2006

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