Chapter 3: Electricity

Q&A -Ask Doubts and Get Answers

Q
Electricity

Question:

An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.

Answer:

Given: R = 8 โ„ฆ, I = 15 A, t = 2 h

The rate at which heat is developed in the heater is equal to the power.

Therefore, P = I^2R

P = (15)^2 	imes 8 = 1800 J/s

P = 1800 J/s


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