Calculating the Cost of Running an Appliance
Calculating the Cost of Running an Appliance
Most appliances and other electrical equipment have a nameplate that indicates
the power requirements.
To calculate the wattage for any appliance, use the formulas below:
For single phase equipment (any residential equipment):
Watts = volts x amps
For three phase equipment (found in some commercial and most industrial
equipment):
Watts = volts x amps x 1.732 (1.732 is the square root of 3)
To determine the cost of running an appliance, use these formulas:
Wattage x Hours Used / 1000 = kWh
kWh x cost of electricity = cost
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