That's because watts = volts x amps So if you look on the back of an electrical device (or on a lightbulb) and it says 1200 watts, and you live in the U.S. or Canada where your house has
120 volts, then: 1200 watts =
120 volts x
10 amps Houses in other parts of the world have electricity that is 240 volts.Oct 18, 2001
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