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World Infromation / Blog : No.10218 : Education Kilowatt hour kWh
Posted by on January 08, 2012 at 08:24:13:
kilowatt-hour (kWh) =a unit of energy equivalent to one kilowatt of power expended for one hour.
1 watt =1 J/s.
One kilowatt hour is 3.6 megajoules of energy converted if work is done at an average rate of one thousand watts for one hour.
An iron rated at 1000 watts , operating for one hour uses one kilowatt hour (equivalent to 3.6 megajoules) of energy.
Using a 80 watt light bulb for one hour consumes 0.08 kilowatt hours of electricity. Using a 80 watt light bulb for 1 thousand hours consumes 80 kilowatt hours of electricity.
1joule = 0.239 calorie
1 cal =4.1868 joule