define commercial unit of energy show it related to Joul
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The SI unit joule is too small to express very large quantities of energy. Hence we use a bigger unit called kilowatt hour (kWh) to express energy. 1 kWh is the amount of energy consumed by an electrical gadget in one hour at the rate of 1000 J/s or 1kW.
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The commercial unit of energy is kWh(kilo watt hour).It is used to measure the consumption of electricity in houses.
The relation between kWh and J(joule) is:
1kwh=1kw×1h
1kwh=1000w×3600s
1kwh=(1000J÷1s)×3600s[1w=1J÷1s]
1kwh=1000J×3600
1kwh=3600000J
1kwh=3.6×10^6J
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