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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

12.6 min

B

4.2 min

C

6.3 min

D

8.4 min

Text Solution

Verified by Experts

The correct Answer is:
C
Heat required to boil water
Q = mc`DeltaT`
`=1xx1xx(100-20)="80 kcal"`
Heat given by supply
`H=v.i.t=200xx4xxt`
`rArr 200xx4xxt=80,000`
`t=(80,000)/(220xx4)`
`=(1000)/(11)sec`
`=(1000)/(11xx60)=1.5"min"`
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