Question

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 1

Answer:

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Answer 2

Rate of heat produced by a device is given by the expression for power as

Where,

P=I^2R

Resistance of the electric heater, R = 8 Ω

Current drawn, I = 15 A

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