What formula do you use to determine the amount of energy used by an appliance?

Answer 1

Power use of an electrical appliance is calculated by finding its rating in watts. The formula is W = I x E. Watts = Amps x Volts.

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Power is a general term. If you want to know how much you pay to power a certain appliance you need to figure out the amperage of the appliance, (usually located on the appliance itself or in the instructions). Power companies use kilowatt hours to charge you for electricity, to figure out how many kilowatt hours your appliance uses you would need to multiply the amperage your appliance uses by .115 and that would give you the kilowatts it is using. Then you would multiply that by how many hours you use said appliance and then multiply by your cost per kilowatt hour, (found on your electric bill).

Answer 2

Multiply the power (in watts) by the time the appliance is on (in seconds). The result is the energy used in joules. Alternately, you can multiply the power in kilowatts by the time in hours; the result is kilowatt-hours.

You can usually find the power on a metal sheet on the appliance that lists the specifications. It is possible that the power in watts is not specified directly; in this case, the current and the voltage will be specified. Multiply the two to get the power. (In AC, in theory you should also multiply by a power factor, but this is often close to 1, and can be ignored.)

Multiply the power (in watts) by the time the appliance is on (in seconds). The result is the energy used in joules. Alternately, you can multiply the power in kilowatts by the time in hours; the result is kilowatt-hours.

You can usually find the power on a metal sheet on the appliance that lists the specifications. It is possible that the power in watts is not specified directly; in this case, the current and the voltage will be specified. Multiply the two to get the power. (In AC, in theory you should also multiply by a power factor, but this is often close to 1, and can be ignored.)

Multiply the power (in watts) by the time the appliance is on (in seconds). The result is the energy used in joules. Alternately, you can multiply the power in kilowatts by the time in hours; the result is kilowatt-hours.

You can usually find the power on a metal sheet on the appliance that lists the specifications. It is possible that the power in watts is not specified directly; in this case, the current and the voltage will be specified. Multiply the two to get the power. (In AC, in theory you should also multiply by a power factor, but this is often close to 1, and can be ignored.)

Multiply the power (in watts) by the time the appliance is on (in seconds). The result is the energy used in joules. Alternately, you can multiply the power in kilowatts by the time in hours; the result is kilowatt-hours.

You can usually find the power on a metal sheet on the appliance that lists the specifications. It is possible that the power in watts is not specified directly; in this case, the current and the voltage will be specified. Multiply the two to get the power. (In AC, in theory you should also multiply by a power factor, but this is often close to 1, and can be ignored.)

Answer 3

You need to know the operating voltage and the current draw of the appliance. These can both be found on a label somewhere on the appliance. The current multiplied by the voltage will tell you power consumption in Watts. Ohms law P=IE (P=Power in Watts, I=Current in amps, E=Voltage in Volts) Your household power consumption is measured in KWh (kilowatt hours) (W x h) / 1000 = KWh ex. If an appliance with a power rating of 1000W were left running non stop for 15 min its total power consumption would be (1000 x .25) / 1000 which equals 0.25 KWh

Answer 4

The easiest way is to get a kilowatt meter.

AnswerUnfortunately, a wattmeter will only tell you the power of your appliance, not the amount of energy it consumes. You could use the wattmeter, if the appliance worked continuously at it rated power but few appliances, other than lamps, do.

So, the simplest method is to ensure that the appliance is the only load switched on, then take a reading of your home's energy meter, and repeat that reading in an hour. The difference in the two readings will tell you how much energy, in kilowatt hours, your appliance has used over that period of time. This method will only work satisfactorily if it has a relatively high power rating; for appliances with low power ratings, you will have to allow a far longer period between readings.

Answer 5

Multiply the power (in watts) by the time the appliance is on (in seconds). The result is the energy used in joules. Alternately, you can multiply the power in kilowatts by the time in hours; the result is kilowatt-hours.

You can usually find the power on a metal sheet on the appliance that lists the specifications. It is possible that the power in watts is not specified directly; in this case, the current and the voltage will be specified. Multiply the two to get the power. (In AC, in theory you should also multiply by a power factor, but this is often close to 1, and can be ignored.)

Answer 6

The total amount of energy used by an appliance is equal to the power consumption multiplied by the time the appliance is in use. E = P x T ENERGY=POWERxTIME DDASIA

Answer 7

The formula used to determine the amount of energy used by an appliance is: Energy (kWh) = Power (kW) x Time (hours)

Answer 8

POWER= VOLTAGE x CURRENT