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NEET 2008 (AIPMT) · Electrical Power & Heating Effect

Electrical Power & Heating Effect question from NEET 2008 (AIPMT)

Q63NEET 2008 · AIPMTMedium

Electrical Power & Heating Effect

An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20oC? The temperature of boiling water is 100oC

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Answer: (c)

Heat needed: $Q = ms\Delta T = 1 \times 4200 \times 80 = 336000\text{ J}$ .
Power: $P = VI = 220 \times 4 = 880\text{ W}$ .
$t = \dfrac{336000}{880} \approx 382\text{ s} \approx 6.3\text{ min}$ .
So the answer is (c) 6.3 min.

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