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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: 112
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[Post New]17 May 2008 21:41:00 IST
    Subject: 112
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Sahadevankazhani (0)

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An electric kettle takes 4A current at 220V. How much time will it take to boil 1 kg of water from temperature 20 oC? The tempertaure of boiling water is 100oC?
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[Post New]17 May 2008 22:03:32 IST
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spideyunlimited (3083)

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P = IV = 880 Watts

P = work / time = 880 joules per sec

Q = mc.del T
c is 4200 J per kg per K for water

Q = 1*4200* 80 = 336000

Time = Q / W = 336000 / 880 = 381.81 seconds

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