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Electrical Power & Heating Effect question from NEET 2026

Q1NEET 2026Easy

Electrical Power & Heating Effect

A room heater is rated $400\text{ W}, 220\text{ V}$ . If the supply voltage drops to 200 V, what will be the power consumed (approximately)?

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Answer: (c)

Resistance from rating: $R = \frac{V^2}{P} = \frac{220^2}{400} = 121\ \Omega$ .
At 200 V: $P' = \frac{200^2}{121} = \frac{40000}{121} \approx 331\ \text{W}$ .
So the answer is (c) 331 W.

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