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What the heck is a kilowatt hour?A kilowatt hour (kWh) is a measure of how much energy you’re using.. )You can't always trust the wattage printed on the device, because many devices don't use the full listed wattage all the time.. (Dividing by 1000 changes it from watt-hours to kilowatt-hours ) That's exactly what I did in the table above.

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Your cost to run the bulb all month is 100 x 730 ÷ 1000 x 15¢ = $10 95 If your device doesn't list wattage, but it does list amps, then just multiply the amps times the voltage to get the watts.. When you buy gas they charge you by the gallon When you buy electricity they charge you by the kilowatt-hour (kWh).

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Exercise #2 Assume that the lights in your kitchen and living room together use 400 watts.. It doesn’t mean the number of kilowatts you’re using per hour It is simply a unit of measurement that equals the amount of energy you would use if you kept a 1,000 watt appliance running for an hour.. Exercise #1 Go get your electricity bill and see how many kilowatt hours you used last month.

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How much does it cost if the lights are on 24 hours a day, for a whole month? How much per year? Assume 15¢/kWh.. (see answer)• 400 watts x 24 hours/day x 30 5 days/month = 292,800 Total Watt-hours• 292,800 Wh / 1000 Wh = 293 kwh • 293 kWh x 15¢/kWh = $44/mo.. When you use 1000 watts for 1 hour, that's a kilowatt-hour For example:DeviceWattageHours usedkWhmedium window-unit AC1000 wattsone hour1 kWhlarge window-unit AC1500 wattsone hour1.. For example, the compressor in a refrigerator doesn't run constantly, only sometimes, so you can't go by the listed wattage for a fridge.. 24 kWhlight bulb100 watts730 hours(i e , all month)73 kWhCFL light bulb25 watts730 hours18 kWhTo get kilowatt-hours, take the wattage of the device, multiply by the number of hours you use it, and divide by 1000.

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My calculator takes this into account by listing the average wattage for fridges.. 5 kWhsmall window-unit AC500 wattsone hour0 5 kWh42' ceiling fan on low speed24 wattsten hours0.. The most accurate way to find the average wattage of a device is to measure it with a watt-hour meter.. Before we see how much electricity costs, we have to understand how it's measured.. You might also be interested in my list of wattagefor most household devices Here's the formula to figure the cost of running a device:wattage x hours used ÷ 1000 x price per kWh= cost of electricityFor example, let's say you leave a 100-watt bulb running continuously (730 hours a month), and you're paying 15¢/kWh.. For example:2 5 amps x 120 volts = 300 watts(If you're outside North America, your country probably uses 220 to 240 volts instead of 120.. If you'd rather not do the math then my handy calculator above will do all the work for you. 0041d406d9