An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from room temperature 200C? The temperature of boiling water is
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a
6.4 minutes
b
6.3 minutes
c
12.6 minutes
d
12.8 minutes
answer is B.
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Detailed Solution
Electric power consumed by kettle, P = 220 x 4 WHeat required,H=1000 × 1 100−20 = 1000 × 80 cal=4200 × 80 JP=Ht ⇒ H=P × t∴ 220 × 4 × t=4200 × 80 ⇒ T=6.3 minutes
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An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from room temperature 200C? The temperature of boiling water is