Question 18:
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:
Rate of heat produced by a device is given by the expression for power as
P = I2R
Where,
Resistance of the electric heater, R = 8 Ω
Current drawn, I = 15 A
P = (15)2 × 8 = 1800 J/s
Therefore, heat is produced by the heater at the rate of 1800 J/s.
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