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In general, the electrical service is routed through a meter, which keeps track of the current flow over time. The line voltage is "known" and that plus the current flow is used to calculate power. Power, which is volts (voltage) times amps (current), is measured in watts. A watt isn't really that big in home energy use, so we look at them in groups of one thousand. A thousand watts is a kilowatt, or kW. If you use a kW for one hour, you have used a kilowatt hour (kW hour) of electricity. And you are sold the electricity by the kilowatt hour.

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