The Power Factor of an AC power system is defined as the ratio of the real power absorbed by the load to the apparent power flowing in the circuit and is dimensionless. In an electric power system, a load with a low power factor draws more current than a load with a high power factor for the same amount of useful power transferred. The “ideal” power factor is one. This is when there is no reactive power through the circuit, and hence apparent power (kVA) is equal to real power (kW). A load with a power factor of 1 is the most efficient loading of the supply. The power factor is 1 for the purely resistive circuit because the reactive power equals zero. The power factor is zero for the purely inductive circuit and capacitive circuit because real power equals zero.