An electric kettle takes 4A current at 220V. How much time will it take to boil 1 kg of water from temperature 20°C? The temperature of boiling water is 100°C:
Text Solution
Verified by ExpertsThe correct answer is:
A
Heat evolved due to Joule's heating effect is used up in boiling water
As per key idea
VIT = ms Δ t
t = 
Putting given values
I = 4A, V = 220 volt, m = 1kg
Δ t = (100 – 20)°C, s = 4200 J/kg°C
t = 
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