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\(^{-1}\))
a
160 s
b
245 s
c
490 s
d
150 s
Explanation
Correct Option
cVideo Explanation
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Faithesther11
3 months ago
Q=MC∆T
and Q=It
therefore It=MC∆T
Have in mind that t is time and T is temperature.
t=MC∆T÷V
t=4×4200×35÷5×240
t=490s
