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The alternating electric current has two components: one active or effective that moves the fan the refrigerator and lights the house and another one that does not do any useful work, but is necessary to sustain the magnetic fields for the induction devices. Both components load the wiring. The non useful component is called reactive component. The active component is measured by the watt-hour meter and the reactive component is measured by var-hour meters. When the load is high, it might be desirable to measure the reactive component to have an idea of the total load called apparent load. The ratio of the active load and the total or apparent load is called the power factor of the supplied load. The power factor varies between 0 and 1.0. The closer to 1.0, the better used the power is. See Reactive Power Management by R. Barreto in Amazon Kindle version.
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