The power caused by this current is called the reactive power. It is denoted by Q .
Q= V x I x cos φ
The reactive power is measured by kVAr (Reactive Kilo Volt ampere). The higher the value of the reactive load, the lower the power factor. For example, as a motor consumes more reactive power its power factor decreases. This is evident from the following diagram.
As the reactive power decreases, the power factor increases.
Alternatively, the power factor is the ratio between the Active power, P and the Apparent Power, S
Cos φ = P/S