Amps=Watts/Volts
100W/120V=.83Amps
100W/120V=.83Amps
Here you can do this by watts dividing by volts.
Here is a formula :
Amperage=Watts/Volts
100W/120V=0.83Amps
Try this ohms law calculator app through which you can easily came to know about the calculations of voltage,current and resistance.
Hope that helped..!
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