All the heat generated in a 5\(\Omega\) 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

View answer & explanation

Correct answer is C

Heat energy = electrical energy

mL = I2Rt

5 x L = 2 x 2 x 5 x 30

L = 120Jg-1

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