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At 10 cents per kWh (Kilowatt hour), one 100 watt incandescent light bulb ran for 24 hours straight will cost 24 cents a day. $7.30 a month, $87.60 a year.

kWh = (Watts Used * Hours per Day * Days per Month) / 1000

Cost per Month = kWh * Cost per kWh

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10y ago

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