What is the formula for reactive power?
in Flexible AC Transmission System by

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Reactive power is denoted by letter "Q". 

Q = I2X

The unit of reactive power is Volt-Ampere-reactive (VAR).

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The formula for reactive power is,

Reactive power = VI sin (phi)
The unit of reactive power is VAR ( Volt ampere reactive). The reactive power is denoted by 'Q'.

The formula for real power is,
Real power = VI cos (phi)
The unit of real power is watts. The real power is denoted by 'P'.
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