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Nov27-12, 02:47 AM
Sci Advisor
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sophiecentaur's Avatar
P: 11,872
It may help to ignore the actual figures for a start. The Watt is a unit of Power - the rate of doing work or using energy. The kW hour is a unit of Energy - just like the more basic Joule. If you read each problem / example carefully you will always see whether Power or Energy is what is needed.
Power is Energy / Time
Energy is Power X Time
Hold that in your head and the numbers will look after themselves.