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

kindly arrange to send me RRB Bangalore previous question paper for JE/Electrical and JE/Signal I am going to write exam on 2010

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