Answer / shalini.b

Power factor is the cosine of angle between voltage &
current.i.e cos(phi)
or
It is the ratio of Active power to reactive power
cos(phi)=KW/KVA

Answer / suhas yeole

it is the ratio of active power to the apperent
power,i.e. cos(Q)=kw/kva

Answer / bijay

To Chetan,
Suppose u got 80 out 0f 100 in an exam.
this means u r at a pf of 0.8, the class topper got 95, so
his PF is 0.95.

Now note that KVA is ur total marks(100)
and KW is what u scored.

now its simple pf=kw/kva

Answer / sudheer

Mr.bijay you are good explainer.
please share this knowledge to every-body.

Answer / mehdi

In the above:

cos(phi)=PF= KW/KVA formula is correct.

but KVA is apparent power not reactive power.

KVA= V*I ,
KW=V*I*cos(phi) ,
KVAR= V*I*sin(phi)

KVA=apparent power=Sqrt(KW*KW + KVAR*KVAR)

Answer / anusree

Efficiency of utilisation of a power supply, higher the pf
better is the efficiency, pf is the ratio of active power
to reactive power

why two over current realy used in vcb.

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