Work or energy is power times time. Scroll down to related links and look at "Kilowatt hour - Wikipedia".
Kilowatt hours.
35,000 BTU = 10.2574875 kilowatt hours.
8500 BTU = 2.5 kilowatt hours.
1 kilowatt = 1,000 watts 6 kilowatts = 6,000 watts 6 kilowatt-hours = 6,000 watt-hours
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To calculate an answer, first multiply the watts used by the hours of use. This will give you watt hours. Now divide your answer by 1000 and this will give you kWh of use. Take the kWh of use and multiply it by the cost per kilowatt that your utility company charges you per kilowatt hour. This information can be found on your electric bill or you can give them a call and ask how much they charge you per kilowatt hour.
A 30-watt bulb uses 0.03 kilowatt-hours every hour, or 30 kilowatt-hours in 1000 hours. To find the kilowatt-hours, multiply 0.03 by the time in hours.
50 watts is 0.05 kilowatts, so in 24 hours it uses 0.05 x 24 kilowatt-hours, or 1.2 kilowatt-hours of energy.
29.4 x 10 = 294 watt hours or 0.294 kilowatt hours.
1 kilowatt is equal to 1,000 watts, so a 100 watt bulb uses .1 kilowatt. Technically, your home or business meter base measures kilowatt hours, meaning that it measures both the kilowatts and the amount of time. If you turn on 10 100 watt bulbs for 1 second, that would be a kilowatt, but the amount of power use would be insignificant. So... To calculate the kilowatt hours: .1 kilowatts (from above, knowing the energy use of the bulb) Multiplied by 24 hours in a day Multiplied by 30 days... .1(kilowatts) * 24(hours)* 30(hours in a day) = 72 kilowatt hours
(3 Kw) x (5 hrs) = 15 kilowatt-hours
Look at kilowatt hours on your bill. Each of those is 1000 watts per hour.