AMPS X VOLTS = WATTS
If an appliance is rated at 5 amps (@ 120V), the load is 600 watts per hour( 5A X 120V = 600W).
Watts aren't sufficient to measure your power consumption. Watts are multiplied by hours and/or fractions of an hour to come up with watt hours.
WATTS X HOURS = WATT HOURS
A 5 amp load for 8 hours a day would come to 4800 watt-hours per day (( 5A X 120V = 600W) X 8hr =4800 watt hours).
Your home's electrical bill is calculated in kilowatt hours which is just watt hours divided by 1000.
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