Question

Derive the relationship between kilowatt hour and joule.

Answer 1

The kilowatt hour (symbol kWh, kW⋅h or kW h) is a unit of energy equal to 3.6 .10^6 joules.

the energy consumed per sec in watt = 1 joule per sec

the standard unit of power in the International System of Units(SI), equivalent to one joule per second and equal to the power in a circuit in which a current of one ampere flows across a potential difference of one volt. Abbreviation: W, w.

1 watt = 1 Amp current x 1 volt potential difference.

1 watt hour will mean = amount of energy consumed in 1 hour (60x60) =3600 sec

so the conversion factor is 3.6 .10^6 J

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