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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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If an electric device rated 230 V, 5 A is operated for one hour, electric energy used
`Vit=230 xx5Axx3600 s=4140000` joules. (2) 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 is used for the measurement of electric energy, rather than the joule.
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