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How much does it cost to leave a porch light on all night?

How much does it cost to leave a porch light on all night?
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How much does it cost to leave a porch light on all night?

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User Jtmarmon
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1 Answer

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Cost = (0.001) x (the wattage of the light) x (the number of hours it's left on) x (the cost of each kilowatt-hour of electrical energy where you live).
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User Msg
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