UNDERSTANDING POWER FACTOR
Beer is active power (kW) - the useful power, or the liquid beer, is the energy that is doing work. This is the part you want. Foam is reactive power (kVAR) - the foam is wasted power or lost power. It’s the energy being produced that isn't doing any work, such as the production of heat or vibration. The mug is apparent power (kVA) - the mug is the demand power, or the power being delivered by the utility.
* Apparent power: S = V x I (kVA)
* Active power: P = V x Ia (kW)
* Reactive power: Q = V x Ir (kvar)
* Power Factor: P/S = cos φ
* S² = P² + Q²
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