Seattle 101 - A Guide for Travelers and Tourists
 North America (including the United States and Canada) generally uses 120 voltage (60 HZ). Outlet sockets use either a Type A plug -- a class II ungrounded plug with two flat parallel prongs, or a Type B plug -- a class I plug with two flat parallel prongs and a grounding pin.
The best way to prepare for plugs and socket outlets different from your own country's is to bring along plug adapters/converters/transformers, which you can attach to extension cords or personal electronics plugs.
Adapters, converters and transformers are different from one another, and should be used for specific needs:
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An adapter does not convert electricity -- it simply allows a dual-voltage appliance, a transformer or a converter from one country to be plugged into the wall outlet of another country.
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One of many models of adapters
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Converters will step voltage up or down, and should only be used for "mechanical" electrical devices that are used for short periods of time, such as hair dryers, steam irons, small fans, etc.
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One of many models of converters
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Transformers are used for "electronic" devices such as CD players, laptops, televisions, fax machines, etc. that are used for longer durations of time. The wattage rating of the transformer must always be larger than the wattage rating of the appliance to be plugged into it.
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One of many models of transformers
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The web sites listed below can help you figure out the wattage and plug/outlet types used by different countries -- this will help you to plan if you want to bring personal electronic devices on your trip abroad.
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