3 Tutor System
Starting just at 265/hour

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

Rate of heat produced by a device is given by the expression for power as, P=$$I_2R$$

Where, Resistance of the electric heater, R= 8 $$\Omega$$

Current drawn, I = 15 A
P= (15)2 x 8 = 1800 J/s

Therefore, heat is produced by the heater at the rate of 1800 J/s.