The difference between the active power P in Watts (W) and the apparent power S in volt-ampere (VA) is the power factor cos φ.
 

We can conclude that P = S*cos φ [W], so S = P/cos φ [VA].
Q (in volt-ampere reactive [VAr]) is the reactive power, which causes the development of heat. We can say that Q = S*sin φ [VAr].
The active power P equals the voltage V in volts (V) multiplied by the current intensity I in amperes (A). We write this as P = V*I [W]
 

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