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NEET 2004 (AIPMT) · Electrical Power & Heating Effect

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

Q76NEET 2004 · AIPMTEasy

Electrical Power & Heating Effect

when three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be

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Answer: (d)

Each bulb: $R = \frac{V^2}{P}$ ; three in series give $3R$ .
$P_{total} = \frac{V^2}{3R} = \frac{P}{3} = \frac{60}{3} = 20\ \text{W}$ .
So the answer is (d) 20 watt.

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