All the heat generated in a 5 ohms resistor by 2A flowing for 30 seconds is used...
Question
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?Options
A) 120J
B) 60Jg-1
C) 120Jg-1
D) 1500J
E) 1500Jg-1
Related Lesson: Summarizing Phase Change and Latent Heat | Heat and Heat Transfer Methods
The correct answer is 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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Heat energy = Electrical energy
mL = I2RT
5 x L = 2 x 2 x 5 x 30
L = 120Jg-1