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Why does reactive energy occur?

It occurs because of physical elements in a consumer’s structure, mainly coils and capacitors. In time, they displace the current against the voltage, so that the electric power obtained mathematically as product between voltage and current may be decomposed in two components: active power and reactive power. The reactive power shall be exchanged continuously between consumer and supplier, between coils and capacitors. As the reactive power circulates and it is not consumed, it is an alternative measure with null value. Theoretically it is considered a conventional measure.

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