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15 w * 24 h = 360 watt-hours. [conversion: 360 (w-h) /1000 (w/kw)= .36 kilowatt-hours]

So, .36 times your local electricity supply and delivery rate (in kilowatt-hours).

For me, supply and delivery of 1 kilowatt-hour is $3.25 (you can find this on your bill)

So, .36 * 3.25= $1.17 to run 15 watt light for 24 hours

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11y ago
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6mo ago

To calculate the running cost of a 15 watt light bulb over 24 hours, you can use the formula: (Wattage x Hours in use) / 1000 x Electricity rate per kWh. If we assume an average electricity rate of $0.12 per kWh, the running cost would be: (15 watts x 24 hours) / 1000 x $0.12 = $0.0432.

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12y ago

It depends on how much your electricity costs.

<<>>

To find this answer multiply your wattage by the amount of hours of use. Take that product and multiply it by the amount that your utility company charges you for each kilowatt hour used.

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11y ago

The cost to run a 28 watt light bulb for 24 hours a day will vary on the price per kilowatt hour. A 28 watt light bulb uses 672 watts in a 24 hours period. This comes to 0.672kw hours in that time frame. If you spend $0.15 a kilwatt hour it would cost $0.10 for the day.

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