Active Power , Reactive Power and Apparent Power

Active Power

• It is defined as the product of RMS voltage, RMS current and cosine of angle between voltage vector and current vector.

       P = VI Cos F

Reactive power

• It is defined as the product of RMS voltage, RMS current and cosine of angle between voltage vector and current vector.

       Q = VI Sin F

Apparent power

• It is defined as the product of RMS voltage, RMS current.

       S = VI

Therefore

S = Ö P² + Q²

   = Ö P² + Q²

   = Ö ( VI Cos F )² + ( VI Sin F )²

    = Ö ( VI )² ( Cos² F + Sin² F )

   = VI

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