Q.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.
Here Given that Resistance of the electric heater (R) = 8 Ω
Current drawn (I) = 15 A
We know that P = I2R
= 1800w or J/s
∴ Heat is produced by the heater at the rate of 1800 J/s.