It depends on how many Amps (current) are applied to the voltage. Watt = Volts x Amps. e.g. 12 volts @ 5 amps = 60 watts
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Amps times volts = watts Watts measures the rate of power usage. watts times hours = watt hours Watt hours is a measure of the amount of power used.
A multimeter measures current in amperes and potential difference in volts. Wattmeters are used to measure watts and the reading is a combination of current being drawn and the voltage applied. watt = volts x amps
This can be easily calculated with the following formula: Power = Volts * Amps To re-arrange to answer you question: amps = power / volts amps = 500 / 120 = 4.166 amps. Or here is an online calculator: http://www.sengpielaudio.com/calculator-ohm.htm
voltage! measured in volts. current X resistance = voltage simple ohms law
Milli amps is a measure of current whilst watt is a measure of power. The missing element is voltage as the formula is:- Power = Voltage * Amps ie power in Watts is the product of Volts (in Volts) times Amps (in Amps)