Reactive power (Q) is used for what?

Question

do anyone know reactive power (Q) is used for what?

Answer 1

Reactive power is utilised in inductive or capacitiance

ciruits but does not produce real work.  It is expressed as

Q and is given by

P=VIcos phie

please note the following for clarification

Active power:  

The time rate of energy per second is power.  Basic unit of

power is watt power for one second requires 1 joule energy

practical unit is kw and 1kw=1000watt



active power is cosumed by the load.

reactive power is loss.

further

Reactive power is

the one which is being used to magnetise the Inductive load

and once its job over it will return back to the source.In

this occasion only harmonics are produced with fundamental

sine waves. and there is no useful work done by this

magnetising current so to make use of this wastefull

current we introduce the static capacitors near the

Inductive loads to produce leading reactive power.To

compansate this reactive power one should supply the active

power to equal amount of reactive power to the system.

hope it is clear

  

Answer 2

Reactance power is used in AC circuits where the voltage and current are not in phase. In DC circuit, the impedence is just purely resistance where for AC circuits the impedence consists of resistance and reactance. Reactance is imaginary... Its pretty much the excess energy stored or released in the inductors or capacitors...

Answer 3

Reactive power is neccessary for the operation of electromagnetic devices such as AC motors, transformers and solenoids. Reactive power is the result of the magnetizing current in these devices.