11.5 Complex Power (3)
S  =      P             +   j               Q
Apparent Power, S = |S| = Vrms*Irms =
Real power,        P = Re(S) = S cos(θv θi)
Reactive Power,  Q = Im(S) = S sin(θv θi)
Power factor,      pf = P/S = cos(θv θi)