17
Question Question 17
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.
Given,
I = 15 A
R = 8 Ω
The rate at which the heat develops in the heater (P) = I2R
Substituting the values in the equation, we get
P = 15 x 15 x 8 = 1800 watt
Therefore, electric heater produces heat at the rate of 1800 W