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All the heat generated in a 5 ohms resistor by 2A flowing for 30 seconds...

Physics
JAMB 1979
All the heat generated in a 5 ohms resistor by 2A flowing for 30 seconds is used to evaporate 5g of a liquid at its boiling point. Which of the following is the correct value of the specific latent heat of the liquid?
  • A. 120J
  • B. 60Jg-1
  • C. 120Jg-1
  • D. 1500J
  • E. 1500Jg-1
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Correct Answer: Option C
Explanation
Heat energy = Electrical energy

mL = I2RT

5 x L = 2 x 2 x 5 x 30

L = 120Jg-1
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