2006-09-16 10:01:19 · 10 answers · asked by jc 2 in Home & Garden ➔ Maintenance & Repairs
Will might be correct, but too complicated. Skip the conversion to joules. This is all you need:
Cost ($) = (watts of bulb) * (hours of use) * ($ per kWh) / 1000
The last divide by 1000 is to convert watt hours to kilowatt hours.
2006-09-18 03:40:22 · answer #1 · answered by An electrical engineer 5 · 3⤊ 0⤋
Great answers.
Depending on where you live, I have found that my electric company's Southern California Edison has a life line rating system. That is to say that the basic charge for a kilo watt will allow me to turn on three light bulbs and one refrigerator, after that the rates double and triple.
I asked the power company and their rates are based on the number of people in the house and the previous years usage.
What a rip off, similar to insurance companies charging by the area you live in, (red lining) I think they call it.
My last electric bill was $498.00 for the month. I have heard some people received bills in access of a $1,000.00.
If you are asking out of curiosity, you have an answer. But if you are asking out of the need to cut down cost, then you need not worry about the small sh**, unplug one of the several refrigerators you have or some of the electronic equipment you are playing with or cut back on using the other appliances during peak hours.
Good luck
2006-09-23 08:44:13 · answer #2 · answered by Anonymous · 0⤊ 0⤋
You need to know what the power co is charging per kilowatt-hour. After that, use the watt rating of the bulb. Multiply watt rating times 3600. This is the amount of Joules of energy used in an hour. A kilowatt-hour is 3 600 000 Joules. Divide that 3.6 million by your number. Multiply by cost per kilowatthour. You will get a low number. You may want to scale up and see how much it will cost to leave it on for a month 24x30.
2006-09-16 17:06:57 · answer #3 · answered by Ren Hoek 5 · 2⤊ 0⤋
determine the cost of the Kilowatt hour (from your power bill) and then use the wattage of the light bulb (25? 30? 60? 100?) to determine the cost.
Are you looking for a minute by minute cost? a weekly cost? a daily cost? a monthly cost? Use the appropriate time unit to determine the appropriate cost
2006-09-16 17:10:34 · answer #4 · answered by cyrenaica 6 · 1⤊ 0⤋
best answer electrical engineer! but adding a comment, basically the more watts a bulb the more cost you will use....that goes for any device period not just bulbs...and when you only have amps to use as a figure,,,, take the amps times the voltage and you get watts... ex: 120 volts times 10 amps = 1200 watts
2006-09-19 17:55:22 · answer #5 · answered by Anonymous · 1⤊ 0⤋
I didn't know that light bulbs could run, but if it's the only one you have you better go catch it. and as far as cost, if you think it's to much then just let it go.
2006-09-24 05:05:43 · answer #6 · answered by starshew2000xl 1 · 0⤊ 0⤋
Kilowatt cost x wattage of bulb.
2006-09-24 13:25:55 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Use your eclectic bill to see your price per kilo-watt per hour divide by 1000 then multiply by wattage of your light bulb.
2006-09-23 15:08:05 · answer #8 · answered by silvercitydog 1 · 0⤊ 0⤋
you need to know the watts that it uses per hour of use multiplied times the cost per watt multiplied by the amount of time thats its turned on.
best guess is less than 50 cents a day for 100w bulb.
2006-09-16 17:08:30 · answer #9 · answered by Red 3 · 1⤊ 1⤋
If you think you might not be able to afford it, turn it off.
2006-09-16 18:07:52 · answer #10 · answered by fibreglasscar 3 · 0⤊ 1⤋