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An electric heater of resistance 8 W draws 15 A from the service mains for 2hours. Calculate the rate at which heat is developed in the heater.
I = 15 A, R = 8Ω
∴ Power P = E/t
P = I2Rt/t
∴ P = I2R
P = 15 X 15 X 8
P = 1800 W
Amount of Heat = 1800 W
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