Why is reactive power called Useless?

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We have three types of powers:

Active Power (KW)

Reactive Power (Kvar)

Apparent Power (KVA)

The most useful power is “Active Power”, it is that power which we need for work and everything is driving on it and electricity is charged on the basis of this power.

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Author: : https://www.quora.com/Why-do-we-call-reactive-power-useless-power