The simple way to calculate cost is $1 per watt per year. This is based on a cost of about 11 cents per kilowatt hour. Your cost may vary.
So, 60 watts times 1/2 year (12 hours /day) divided by 12 ( 1 month) equals $2.50 per month.
17 days and 17 hours minus 8 days and 7 hours equals 9 days and 10 hours.
5 days 4 hours - 2 days 11 hours = 2 days 17 hours
6 days 15 hours minus 3 days 20 hours equal 2 days 19 hours.
There are 24 hours in a day so 10 days is 240 hours. 243 hours is 10 days and 3 hours.
4 days 4 hours
Takes 300 hours for the average light bulb to burn out
Takes 300 hours for the average light bulb to burn out
The bulb uses 7.5 watt-hours each hour, or 90 watt-hours if left on for 12 hours. 1 unit of electricity would be used in 11 days at 12 hours per day.
You cannot leave it becuase the bulb will burn out and then probably do some damage to your house. You can if you close the lights after a few hours then turn it on again. Good luck!
If a light bulb is handled roughly before it was installed, the filament holder could have been weakened. Another reason that bulbs burn out before their time is that they are being submitted to a higher voltage than the bulb rated for.
A flourescent light bulb lasts between 6000 to 18000 hours.
At 10 cents per kWh (Kilowatt hour), one 100 watt incandescent light bulb ran for 24 hours straight will cost 24 cents a day. $7.30 a month, $87.60 a year. kWh = (Watts Used * Hours per Day * Days per Month) / 1000 Cost per Month = kWh * Cost per kWh
A simple electrical device is a 60 watt light bulb. The bulb is consuming 60 watts of electricity from the moment you turn it on. If you keep that light bulb on for 10 hours the power used is 60 watts x 10 hours = 600 watts of power. Electricity is sold in Kilowatt Hours. A Kilowatt is 1000 watts of power. Depending on the state you live in, it sells for 7 to 18 cents per Kilowatt Hour. So if you leave that light bulb on 10 hours per day for 30 days you will have used up 600 watts x 30 days = 18,000 watts of electricity = 18 Kilowatt Hours. At an average cost of 10 cents per Kilowatt Hour that bulb costs you $1.80 per month to leave on. The formula is watts x time x cost per Kilowatt Hour = cost of use...Answer provided by Gene Evangelist
Convert the 100 watts to kilowatts. Calculate the total time in hours, and multiply by the number of kilowatts that the light bulb uses.
By bulb, it is assumed a light bulb is intended rather than a flower bulb or any other kind of bulb. Light bulbs burn out because they are engineered to do so. There would be less profit to the bulb manufacturer if he made bulbs to last longer, which he could if he wanted to. In the early days of bulb manufacture, a bulb was made which still continues to burn over 110 years later. See the link below for more information on the 110 year bulb.
-9900
5 days 12 hours = 5.5 days19,800 / 5.5 = 3,600 watt-hours per day = 150 watts