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An electric kettle takes 4 A current at ...

An electric kettle takes `4 A` current at `220 V`. How much time will it take to boil `1 kg` of wate from temperature `20^(@)C`? The temperature of boiling water is `100^(@)C`

A

6.4 mimutes

B

6.3 mimutes

C

12.6 mimutes

D

12.8 mimutes

Text Solution

Verified by Experts

The correct Answer is:
B
(b) Electric power consumed by kettle `P = 220 xx 4 W`
Heat require
`H = 1000 xx 1 (100 - 20) = 1000 xx 80 cal`
`= 4200 xx 80 J`
`P = (H)/(t) implies H = P xx t`
`:. 220 xx 4 xx t = 42000 xx 80 implies T = 6.3` minutes
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