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In practice the unit kW.h rather than th...

In practice the unit kW.h rather than the joule, is used for the measurement of electric energy.

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(1) If an electric device rated 230 V, 5 A is operated for one hour, electric energy used
`=Vit=230 V xx 5 A xx 3600 s=4140000` joules.
If this energy is expressed in kW.h, it will be `(4140000)/(3.6xx10^(6))` kW.h`
= 1.15 kW.h (more convenient). Hence, in practice the unit kW.h rather than the joule, is used for the measurement of electric energy.
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