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NEET 2004 (AIPMT) · Electrical Power & Heating Effect

Electrical Power & Heating Effect question from NEET 2004 (AIPMT)

Q77NEET 2004 · AIPMTEasy

Electrical Power & Heating Effect

In India electricity is supplied for domestic use at 220 V. It is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in India is R, the resistance of a 60 W bulb for use in USA will be

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Answer: (c)

For the same power, $R = \frac{V^2}{P} \propto V^2$ .
$R_{USA} = R\left(\frac{110}{220}\right)^2 = \frac{R}{4}$ .
So the answer is (c) $R/4$ .

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