power factor

[asimattar]

hi all
i have a proeblem
how to calculate the power factor please tell me the whole procedure and how to read motor ratings written on the motor
please help

 

[stevez]

A basic electronics text is where I would begin - available at your school or local library. Googling on 'power factor calculation' might also produce results however I would be cautious unless you first verify the credentials of the author(s). Almost anyone can author a paper or article but people can and do make mistakes. They may also think they understand something when in fact they misunderstand terribly.

 

[oldtimer]

You simply use pythagaros since the current in the circuit will lag or lead the current through the resistive element. Most loads are inductive so the current lags IR by a certain angle a capacitor is introduced into the circuit to cancel out IXL and therefore reduce the AC current.

 

[Papabravo]

It's the cosine of the phase difference

 

[Russlk]

You won't find power factor written on the motor because it is dependent on the load. The motor will have rated voltage, maximum current, and frequency written on it.

 

[oldtimer]

You can if you wish use "J" which is the square root of -1.