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

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

Correct Answer: Option C

Explanation

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