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power = voltage x current, power has nothing to do with time. Electrical energy is power x time.

so at 110 volts *household current, power = 110 x 12 = 1320 watts

and energy = 1320 x 8 = 10,560 watt-hours or 10.56 kilowatt-hours

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Q: How much power is used in 8 hours with 12 amps appliance?
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