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21/07/2021 8:03 pm
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How much energy is consumed when a current of 5 amperes flows through the filament (or element) of a heater having resistance of 100 ohms for two hours? Express it in joules.
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21/07/2021 8:05 pm
I = 5 amp, R = 100 ohms, t = 2h
We know that
Electric energy consumed = P x t = I x I x Rt
= 25 x 100 x 2
= 5000 Wh
= 5 kwh
We know that 1 kwh = 3.6 x 106 J
Therefore, 5 kwh = 5 x 3.6 x 106 J
= 18 x 106 J.