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How long does it take a 750W heater to raise the temperature of 1kg of...

Physics
JAMB 1991
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
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Correct Answer: Option C
Explanation
Heat energy = Elect. energy

mc\(\theta\) = power x time

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

t = 168s
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