How long will it take to heat 4 kg of water from 30ºC to 65ºC using an electric kettle taking 5 A from a 240 V supply?
(Specific heat capacity of water = 4200 J kg\(^{-1}\) K\(^{-1}\))
Answer: C
Time = \(\frac{(mcΔT)}{(VI)}\) = \(\frac{588000}{1200}\) = 490 s.
There is an explanation video available below.
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