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An electric heater is used to melt a block of ice of mass 1.5kg. If...

Physics
JAMB 1989
An electric heater is used to melt a block of ice of mass 1.5kg. If the heater is powered by a 12V battery and a current of 20A flows through the coil, calculate the time taken to melt the block of ice at 0oC. [specific latent heat of fusion of ice = 336 x 103Jkg-1]
  • A. 76.0min
  • B. 35.0min
  • C. 21.0min
  • D. 2.9min
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Correct Answer: Option B
Explanation
Elect. energy = heat energy

IVt = mL

20 X 12 t = 1.5 x 336 x 103

t = 2100 sec ; t = 35mins.
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