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The rating of any electrical appliance or piece of electrical equipment is calculated in watts because the watt is the international unit for power.

The electrical power of a purely resistive load is calculated using the Power Equation:

Power (watts) = Voltage (volts) x Current (amps)

For a reactive load - such as an ac electric motor - the Power Equation has to be modified to allow for its Power Factor:

Power (watts) = Voltage (volts) x Current (amps) x Power Factor

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