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Well lets see, 40 watts for 1 hour is equivalent to 0.04 KWh. Average electric costs is roughly 18 cents per KWh so 0.04KWh would cost 0.72 cents ($0.0072).

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14y ago
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14y ago

It depends on how much your electricity costs.

At 14 cents per kilowatt hour a 32 watt bulb (.032 kilowatts) for 24 hours, would be $.14 x .032kw x 24hr = 10.7 cents.

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14y ago

The formula you use is, Kilowatts x hours x price you are charged per kilowatt/hour (usually about .07 to 10 cents a kilowatt/hr). 1000 watts = 1 kW.

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10y ago

It would use 4 x 12 watt-hours, that is 0.048 kilowatt-hours, also described as 0.048 of a Unit, which would probably be about 1 cent or somewhat less.

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Q: How much does it cost to run a 1000 watt light bulb in 12 hours?
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