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If you run a 100 watt bulb for 10 hours you would 1 kilowatt hour (kWh). The cost of electricity varies by location usually. Mine even has a sliding scale based on the usage and goes from $.08 to $0.25 per kWh. Look at your electric bill to see if it shows a rate per kWh. If it does not, divide the dollar amount of your bill by the total kWh used to get a rate per kWh. That will be the cost to run a 100 watt bulb for 10 hours.

Rather than calculating KWh's, and getting out your power bill or calling the Public Service Commission - there's a 'rule of thumb' (2007 numbers) - a 100 Watt light bulb costs about 100 dollars per year if left on continuously....a typical 1200 watt heater will cost you 100/month if used heavy in the winter months.... (takes into account increased startup current, on/off time(duty cycle) and left set at reasonably warm temp day/night).

simple a dollar/watt/year!...

100W - $100/year, 200W - $200/year, 1200W=$1200/year

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11y ago

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