Question

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

Answer 1

r=8Ω
i=15A
t=2h

e(energy)=i²rt
ie:        e=8x8x15x2
            e= 1920wh
               =1.92kwh

Answer 2

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