How long will it take to heat 3kg of water from 28oC to 88oC in…

Physics WAEC 2006

How long will it take to heat 3kg of water from 28oC to 88oC in an electric kettle taking 6a from a 220V supply? [specific heat capacity of water = 4180 J kg-1K-1]

  • 120s
  • 570s checkmark
  • 600s
  • 836s

The correct answer is: B

Explanation

t = \(\frac{mc\theta}{IV} = \frac{3 \times 4189 \times 60}{6 \times 120} = 570s\)
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