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Electrical Engineering

What is a kWh?

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September 05, 2010 8:19PM

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KiloWatt hours. Its a measure of energy use. It is the amount of power used over time.

Energy is the ability to do work, while power is the rate at which work is done.

Your water heater may have a power rating of 5 kW. If it runs for 8 hours in a day, you would use 40 kWh of energy doing the work of heating the water.