how to calculate how much electricity an appliance uses?
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['Device Wattage (watts) x Hours Used Per Day = Watt-hours (Wh) per Day.', 'Device Usage (Wh) / 1000 (Wh/kWh) = Device Usage in kWh.', 'Daily Usage (kWh) x 30 (Days) = Approximate Monthly Usage (kWh/Month)']
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A typical water heater will use around 4000 watts. Click calculate to find the energy consumption of a water heater using 4000 Watts for 3 hours a day @ $0.10 per kWh.
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So, just multiply the watts times the hours used to get the watt-hours. (Then divide by 1000 to get the kilowatt-hours, which is how your utility charges you.) Example: 100-watt bulb x 2 hours ÷ 1000 = 0.2 kWh.
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Many Appliances Use Just as Much Power When Off Always leaving a laptop computer plugged in, even when it's fully charged, can use a similar quantity — 4.5 kilowatt-hours of electricity in a week, or about 235 kilowatt-hours a year.
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To calculate your electrical load, you can add the total Wattage for each of your appliances and see your household's total cumulative electrical load.
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One kilowatt is equal to 1000 watts, so to calculate how many kWh a device uses, divide the watt-hours from the previous step by 1000.
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The formula for calculating wattage is: W (joules per second) = V (joules per coulomb) x A (coulombs per second) where W is watts, V is volts, and A is amperes of current. In practical terms, wattage is the power produced or used per second.
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Calculate the power the motor consumes while in operation. The equation is W = AV(sqrt 3) where A is amperes, V is volts, and sqrt 3 is the square root of 33 (about 1.73). W is the power consumption in watts. For example, if the electric motor uses 50 amps at 240 volts, the wattage is 50 x 240 x 1.73, or 20,760 watts.
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A typical whole-home air conditioner uses a 240-volt power outlet. Multiply the amps by 240 watts, which equals 4,320 watts. To find the kWh, divide by 1,000. 4,320 watts / 1,000 = 4.32 kWh.
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How to calculate the energy consumption by Air Conditioner (AC) load? For example if the power rating of AC is 1000 W and operated for 12 hours, then we will simply multiply time and power to calculate the energy consumption. E= 12000 Watt-hour.
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Calculate the kilowatt-hours (kWh) required to heat the water using the following formula: Pt = (4.2 × L × T ) ÷ 3600. Pt is the power used to heat the water, in kWh. L is the number of liters of water that is being heated and T is the difference in temperature from what you started with, listed in degrees Celsius.
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To calculate usage, read the numbers you recorded for each dial from left to right (our example reading would be 9079). To determine how many kilowatt-hours (kWh) you have used, subtract the previous reading from the current reading and multiply the difference by the meter multiplier, which can be found on your meter.
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To calculate the carbon dioxide emitted by the total amount of electricity generated (in kWh) utilized by you, first add up the electricity bills for the year and then multiply it by 1.22, which is the average amount of CO2 in pounds that is emitted per KWh of electricity generated, in the U.S.
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In the United States, most household appliances work at 110 Volts. So the calculation is divide the Wattage by 110. For example: A 40 Watts bulb draws 0.36 Amps to operate. A 60 Watts bulb draws 0.54 Amps to operate.
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To calculate the cost of running your PC at full load for one hour, you need to divide the watt usage by 1000 and multiply the result by your kWh. If your PC uses 300 watts while gaming, then one hour of play time would cost you just under 4 cents.
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125 watts x 3 hours = 375 Wh/Day However, electricity on your bill is measured in kilowatt-hours (kWh), not watt-hours. One kilowatt is equal to 1000 watts, so to calculate how many kWh a device uses, divide the watt-hours from the previous step by 1000.
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Find the energy used in kilowatt hours (kWh) by multiplying the total wattage for the fixture by the hours per day that the lights are on. Next, divide this by 1,000. To determine the monthly cost, multiply the energy used per day by 30 to get the monthly kilowatt hours used.