Follow Our FB Page << >> for Daily Laughter. We Post Funny, Viral, Comedy Videos, Memes, Vines...

what is power factor

Answer Posted / suresh

The power factor of an AC electric power system is defined
as the ratio of the real power flowing to the load to the
apparent power [1] [2], and is a number between 0 and 1
(frequently expressed as a percentage, e.g. 0.5 pf = 50%
pf). Real power is the capacity of the circuit for
performing work in a particular time. Apparent power is the
product of the current and voltage of the circuit. Due to
energy stored in the load and returned to the source, or due
to a non-linear load that distorts the wave shape of the
current drawn from the source, the apparent power can be
greater than the real power.
In an electric power system, a load with low power factor
draws more current than a load with a high power factor, for
the same amount of useful power transferred. The higher
currents increase the energy lost in the distribution
system, and require larger wires and other equipment.
Because of the costs of larger equipment and wasted energy,
electrical utilities will usually charge a higher cost to
industrial or commercial customers where there is a low
power factor.
Linear loads with low power factor (such as induction
motors) can be corrected with a passive network of
capacitors or inductors. Non-linear loads, such as
rectifiers, distort the current drawn from the system. In
such cases, active power factor correction is used to
counteract the distortion and raise power factor. The
devices for correction of power factor may be at a central
substation, or spread out over a distribution system, or
built into power-consuming equipment.

Is This Answer Correct ?    29 Yes 3 No

Post New Answer       View All Answers

Please Help Members By Posting Answers For Below Questions

What is the permissible limit of shaft voltage for 6.6 KV motors ? Why? Is there any standard is available?


What is the difference between electronic regulator and ordinary rheostat regulator for fans?


why star point of HT motor not earthed?


why should small green grass ans small plant should not be there inside the transformer Yard in the factories


what is the max. acceptable leakage current in 33kv bus bar


sir please send me iocl written test paper in my e-mail account. i'll be obliged to you........ thank u roshan


any body,pls tell me how to done relay coordination ? how to coordinate by TCC curve?how to read the tcc curve?


how the works electronic energy meter?


Explain the propagation of harmonics in the network and influence of phase angle of harmonics.


hi frds, i m electrical engineer.can i get cdr for electrical engineer if u have then send me on my mail id its help me frds


Whether should be the oil level in OCTC transfomer? It should be upto winding immersed completely or should be upto tap changer s/w? How it will affect the performance of the transformer. Rating may be 33KVA


how to remover corona effect and hysteresis losses from contactor


what is formula for calculate thermal overload in new numiricalrelay( not in bimetal relay)?


What is the Resposiblity of Electrical Utility Engineer


How can we measure earthing resistance test (Earth meggar) of Transformer neutral pit while in live condition?.