1. Determine the voltage. You can do the math if you know either watts or amps, but you need the voltage to do it. North American wall outlets operate at 110 volts, whereas those
http://www.ehow.com/how_4925656_convertwattsamps...

1. Familiarize yourself with the quantities involved. To understand the relationship between watts and amps, you will need to understand 3 different units: watts, amps, and volts.
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divide by volts.
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3000 Watts is equal to 1000 amps.
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