5.6 Average Power, Reactive Power and Power Factor cont.
P and Q as sides of the Power Triangle and
P and Q as the real and imaginary parts of complex power S (whose magnitude S is called apparent power)
S = P + jQ = VRMSIRMScosq + jVRMSIRMSsinq
N.B.: q is called the power factor angle where the power factor is either cos(q) lag if q > 0, cos(q) lead if q < 0 or unity (q = 0)