Heat is supplied to a test tube containing 100g of ice at its melting point….

Physics JAMB 1994

Heat is supplied to a test tube containing 100g of ice at its melting point. The ice melts completely in 1 min.What is the power rating of the source of heat? [Latent heat of fusion of ice = 336Jg-1]

  • 336W
  • 450W
  • 560W checkmark
  • 600W

The correct answer is: C

Explanation

p x t = heat energy

P x 1 x 60 = 100 x 336

p = 560W
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