Electrical Projects Most U.S. appliances are designed to be used on 110 to 120V ac, 60 Hz current. If an appliance is going to be used on the 220V ac, 60 Hz current found in many European and other foreign countries, the 110V appliance can be coupled to the 220V current through a 2:1 stepdown transformer. These transformers are commercially available, and the same transformer can also be used to convert a 220V foreign-made appliance to 110V domestic current.

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August 20, 2008