Q.

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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