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 water from temperature `20^@`C ? The temperature of boiling water is `100^@` C.

6.3 min

8.4 min

12.6 min

4.2 min

Text Solution

Verified by Experts

The correct Answer is:

Heat required to boil water of 1 kg from `20^@C` to `100^@C`
`Q=ms DeltaQ=(1xx4200xx80)` J
Power of kettle (P)=VI=(220 x 4) W
`therefore` Time taken = `Q/P`
`=(1xx4200xx80)/(220xx4)`
=381.81 s =6.36 min

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