Question

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

Answer 1

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Heat developed in the heater is given by

H = I2Rt

Where,

I = 15 A,

R = 8 Ω

time t = 2 hours

The rate at which heat is developed is given by

H = I^2 R t / t = ^2 = (15)^2 × 8 = 1800 /

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