### 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}^{}

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^{}

^{Ideal voltage source and Ideal current source}

^{}

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