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.

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#### Solution

Rate of heat produced by a device is given by the expression for power as, *P*= *I ^{2}R*

Where,

Resistance of the electric heater,

*R*= 8 Ω

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.

Concept: Effects of Electric Current - Heating Effect of Electric Current

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