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JEE Main 2006 (AIEEE) · Electrical Power & Heating Effect

Electrical Power & Heating Effect question from JEE Main 2006 (AIEEE)

Q67JEE Main 2006 · AIEEEEasy

Electrical Power & Heating Effect

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

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Answer: (c)

Fixed resistance: $P \propto V^2$ .
$P' = 100 \times \left(\frac{110}{220}\right)^2 = 25\ \text{W}$ .
So the answer is (c) 25 watt.

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