Question

An electric heater of resistance 8Ω, takes a current of 15 A from the mains supply line. Calculate the rate at which heat is developed in the heater.

Answer 1

Given R = 8 ohms, I = 15 amp, t = 1 sec

We know that

H = I²RT

H = 15² x 8 x 1

H = 1800 J/s