Power Factor Rating

maybe because you can deduce that the amperage of a flourescent tube is constant while in transformers and engines it depends on the load?

load can be inductive or capacitive?

that's why we cant use generally the rating of transformer in KW because its depending upon inductive or capacitive load by which we can decrease or increase our PF as well as KW.

You try explaining to Mrs. Brown that her appliance is XX VA.

She has trouble getting her head around a 60 watt lamp.

Such a miniscule load as a flourescent tube, regardless of PF, has no meaningful effect on the PF of a power distribution system.

Good question, Ive never heard a historic answer- I assume its from the early 1900s.

An ordinary consumer is only interested in how much he/she would pay for (better say, save on) electricity with those lamps.

Lightened by many thousands in the houses of a big city they, however, influence the PF in the city grid, but it's an interest of others.

The real reason why no device brings a Power Factor specified is because The power factor is dependant on the combination of Resistive, capacitive And inductive loads connected to a circuit or electrical network at any specific time, defining in this way the Efficiency in the use of the energy consumed in The circuit or electrical network by The combination Of a all devices interconnected. Kpitch!!! Rafael L. Lama, P.E. rlama@caribe.net http://casadominicanadepuertorrico.ning.com

Check the PF of a computer. OK not the biggest load in the world but as you make the computer work so the PF changes.

Fluorescent lights have been mentioned. Generally the 'energy efficient' are anything but that. Yes - they be 9W or 11W but they are no where near 9VA or 11VA. Generally the PF is around 0.5. More green lies to confuse the public.

To ::All

Thanks for ur valuble inputs on this topic, it has been very engaging and informative.

Thanks again for sharing ur experience!

shalom..