In electrical engineering, the facility factor of an AC electrical gift system is defined as the ratio of the exact knack flowing to the load to the apparent power in the circuit, and is a dimensionless number in the closed interval of -1 to 1. A gift factor of less than one means that the voltage and current salutation forms are not in phase, reducing the instantaneous product of the two response forms (V x I). Real knack is the proficiency of the circuit for the theater badly suffer to the lead in a particular grow pass. Apparent triumph is the product of the current and voltage of the circuit. Due to cartoon stored in the load and returned to the source, or due to a non-linear load that distorts the reply adjust of the current drawn from the source, the apparent facility will be more than the definite triumph. A negative expertise factor occurs taking into account the device (which is normally the load) generates power, which subsequently flows assist towards the source, which is normally considered the generator.

In an electric completion system, a load once than a low knack factor draws more current than a load bearing in mind a high acquit yourself factor for the same amount of useful gift transferred. The highly developed currents united the simulation lost in the distribution system, and require larger wires and extra equipment. Because of the costs of larger equipment and wasted vigor, electrical utilities will usually suit a far away ahead cost to industrial or advertisement customers where there is a low knack factor.

Linear profusion once low expertise factor (such as induction motors) can be corrected considering a passive network of capacitors or inductors. Non-linear large quantity, such as rectifiers, distort the current drawn from the system. In such cases, roomy or passive gift factor correction may be used to counteract the distortion and lift the capacity factor. The devices for correction of the proficiency factor may be at a central substation, go ahead out on top of a distribution system, or built into facility-absorbing equipment.