*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
P

^{2}+ Q^{2}
= Ö P

^{2}+ Q^{2}
= Ö ( VI Cos F
)

^{2}+ ( VI Sin F )^{2}^{ }= Ö ( VI )

^{2}( Cos

^{2 }F + Sin

^{2}F )

= VI

^{}

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