How Much does It Cost to Run a Light Bulb?

the power to run a light bulb first depends on your rate of electricity lets talk a little about how it works.when you pay for electricity you pay by the kilowatt-hour(kWh).Basically if youo use 100 watts for 1 hour that='s a kilowatt-hour.Let's give a related example let's say you use a light bulb its a 100 watt light bulb let's ssay you left it on all month long(730hours)= 73kWh.Now that we got the basics of how you are charged here is a small formula to help you figure it ( you need to know your per kWh charge for your home) but we will just use .10 cents for the example. So take the wattage of your light bulb(varies) but lets say 100 watts.Now lets make a plan to only use this bulb 3hrs a day for 1 mth(90 hours)so that would equal 9 kilo-watt hours now if your rate was .10cents per kWh x 9kWh= it would cost you .90cents to run that bulb