Q.17.    An electric heater of resistance 8\Omega  draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.
 

Answers (1)

Given : R=8 Ohm ,I=15A  and t= 2hr

Heat developed in heater is H.

H=I^2Rt

Rate at which heat is developed is given as 

        \frac{I^2Rt}{t}=I^2R=15^2\times 8=1800J/s

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