# Power Factor

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Related to Power Factor: reactive power

## power factor

[′pau̇·ər ‚fak·tər]
(electricity)
The ratio of the average (or active) power to the apparent power (root-mean-square voltage times rms current) of an alternating-current circuit. Abbreviated pf. Also known as phase factor.

## Power Factor

(cos ɸ), the ratio of the average power of alternating current to the product of the effective values of voltage and current. The maximum value of the power factor is 1. For a sinusoidal alternating current, the power factor is equal to the angle of the phase shift between the sine curves of voltage and current and is determined by the circuit parameters: cos ɸ = r/Z, where ɸ is the phase shift angle, r is the effective resistance of the circuit, and Z is the total impedance. The power factor may have a value different from 1 even in circuits containing only resistances, if the circuits contain any nonlinear sections. In this case the power factor is decreased because of the distorted shape of voltage and current curves.

## power factor

In an alternating current, the ratio of the average power (expressed in watts) to the apparent power (expressed in volt-amperes).
References in periodicals archive ?
Induction motor blocks itself the EMF, current, voltage and power factor blocks are present.
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The oldest private company specialising in the little known technology of Power Factor Correction, Power Capacitors has engineers throughout the UK.
After fitting the new equipment, Eaton carried out a second survey on the site's electrical installation which revealed that the maximum load current had now been reduced to approximately 350A, with a power factor of about 0.
However, inductive loads such as HVAC compressors and motors with a low power factor can increase the reactive or 'non-working' power considerably, Laloggia said.
The campaign will run across broadcast media and have a visible presence with 150,000 Power Factor Correction leaflets distributed to businesses in the emirate," commented Amal Koshak, Senior Manager Demand & Tariff Management.
A leading provider of turnkey MEP solutions in the region, Power Factor will execute the projects in association with Al Arif Contracting, who are the main contractors for all the three projects.
A low power factor forces utilities to deliver more power to accomplish a given amount of work Utilities spend more serving customers with a low power factor.
The power factor of ammo, which is determined by multiplying muzzle velocity in foot-seconds by bullet weight in grains, must equal 165,000.
Low-energy light bulbs have a capacitative component, and I suspect that the energy monitor is not making an appropriate power factor correction.
Therefore, in order to calculate the required amount of capacitance to raise the power factor of an electric power system, respectively the cable networks admittances, to a specified higher power factor, we notice that some utilities calculate the power factor as an average during the 30--40 min interval coincident with the peak kW or kVA demand, depending on how utility bills for peak demand.
They have the problems of poor power quality in terms of injected current harmonics, resultant voltage distortion and poor power factor at input ac mains and slowly varying rippled dc output at load end, low efficiency, and large size of ac and dc filters, [1-2].

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