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Calculate the time taken to heat 2kg of water from 50°C to 100°C in an...

Physics
WAEC 1994

Calculate the time taken to heat 2kg of water from 50°C to 100°C in an electric kettle taking 5A, from a 210V supply. (Specific heat capacity of water = 4200\(kg^{-1}K{-1}\)

  • A. 2.5 minutes
  • B. 5.7 minutes
  • C. 6.7 minutes
  • D. 7.5 minutes
  • E. 9.5 minutes
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Correct Answer: Option C
Explanation

t = \(\frac{mc\theta}{p}\)

= \(\frac{2\times4200\times50}{210\times5}\) = 400s = 6.7minutes

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