How long will it take to heat 4 kg of water from 30ºC to 65ºC...

JAMB 2025

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

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Correct Answer: Option C

Explanation

Answer: C

Time = \(\frac{(mcΔT)}{(VI)}\) = \(\frac{588000}{1200}\) = 490 s.

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How long will it take to heat 4 kg of water from 30ºC to 65ºC...

Correct Answer: Option C

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