V and I are the voltage and current phasors(rms values)

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φ = Dummy Text °

S is the Apparent power

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S = P + Q j
Where P is the real power(or average power) and Q is the reactive power

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If V and I are the rms or effective voltage and current phasors represented in complex form.

The complex power 'S' is defined as the product of V and conjugate of I

S = V . I*

S = P + Q j

P = |S| Cos (φ)

Q = |S| Sin (φ)

{|S|}^{2} = {|P|}^{2} + {|Q|}^{2}

I* is the conjugate of I.

S is a complex number the real part (P) is the real or average power and the imaginary part (Q) is the reactive power.

φ is the phase angle.