Answer / nandu

this is approximation:
As we know that power factor can,t be grater than 1 and we
also know that our supply voltage variation is -10% to +10%
we can't take +10% because pf<=1
so -10% of 230 is v(10%)=207v
as we already know that pf=p/vi
=> i=p/v(10%) =100/207A
=> pf=100/230(100/207)=207/230=0.9

so power factor is (approximate) = 0.9

Answer / asheesh

to calculate power factor first we have to calculate
current. for this we can apply rated voltage to load and
then measure the current flowing through load by measuring
instrument and then
power factor = watt/rated voltage*current

Answer / ajayiet

ha ha he man are u all
insane.load rating is either in
kva or kw.100 w means that
either it is a motor load or
resistance.so pf is unity.

Answer / remodeen

WITHOUT KNOWING CURRENT .,,, HOW WE CALCULATE PF???

Answer / ashish

easy B L. THERJA RAED KARO ANSWER MIL JAYEGA

Answer / ashok kumar

impossible

Answer / amarnath

PF= 0.8 Default

Use the Formula P=V*I*Cos PI
P= Power= 100W
V= Voltage= 230V
I=?
Cos PI= 0.8

Answer / ahmed

what type of load

u can just estimate it

Answer / gnaneshwar

without knowing current we cannot find the powerfactor.As per
question we have voltage v=230 and power p=100w as per
ohm'slaw p=vi,so I=p/v you'll get current then powerfactor=p/vI

Answer / bhigesh

pf=kva/kw

How the neutral earthing is connected in DG alternator

6 Answers  

What is a soft start?

2 Answers   Bhel, jlpl,

What is difference between VCB and SF6 breaker

4 Answers  

Why HT voltages are expressed in 11KV,22KV,33KV and so on? (ie in times of 11)

3 Answers   Bhel, Park Hotel,

why we need to us lenz's law for synchornous motor

0 Answers   Tata Elxsi,

percetans

0 Answers   Bhel,

How to find synchronous motor speed formula Ns=120f/P ?....

2 Answers   Cranedge,

what is the principle of the single phase energy meter? and,what is the advantages and disadvantages of single phase energy meter?

0 Answers  

Why in power plant projects we see DOL starting method used for motors upto 160 kW instead of star delta method

0 Answers   UCC,

what is the CT & PT. where is it uses.what is the using that plese kindly answer me...?

4 Answers   Cap Gemini, JLL,

a.)Ammeter and Voltmeter read rms value or avg. value ? b.)What are symmetrical and Unsymmetrical faults?

2 Answers  

WHAT SHOULD BE THE RATING OF generator required to run a pump motor of 45 Kw.

1 Answers   Jauss Polymers,