In by Jackie Dunn

The driving force behind the flow of electricity, similar to the pressure in a water pipe. Most U.S. homes are wired with 110- and 220-volt lines, with the 110-volt power used for lighting and most of the other circuits, and the 220-volt power used for the refrigerator/freezer, stove, water heater, clothes washing machine and dryer, and similar large household appliances.

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