How long does it take a 750W heater to raise the temperature of 1kg of water from 20oC to 50oC [specific heat capacity of water = 4200Jkg-1K-1]

A.

84s

B.

112s

C.

168s

D.

280s

View answer & explanation

Correct answer is C

Heat energy = Elect. energy

mc\(\theta\) = power x time

1 x 4200 x (50 - 20) = 750 x t

t = 168s

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