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You are billed on Kwh or 1000 watts used over an hour. Watts have no time component to them so a 60 watt light bulb will draw 60 watts for how ever long it is on.
To pay for it:
multiply 60 (or the number of watts your device uses) by the number of hours on (say 10) = 600 watt hours
divide by 1000 = .6 Kwh.
multiply that by your $ per Kwh = cost
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