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    Rearends's Avatar
    Rearends Posts: 1, Reputation: 1
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    #1

    Nov 1, 2010, 02:48 PM
    How many Watts can a 20 amp Support
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Nov 2, 2010, 02:50 AM
    Need to know the voltage to calculate wattage.

    Ohms Law states Power = Voltage times Amps

    120 volts times 20 amps equals 2400 watts.

    Then there are derating factors required by the National Electric Code for various types of loads or conditions.
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