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.

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.

 

Answer:-

Here Given that Resistance of the electric heater (R) = 8 Ω
Current drawn (I) = 15 A
We know that P = I2R
                         = 15×15×8
                          = 1800w or J/s

∴ Heat is produced by the heater at the rate of 1800 J/s.