Quote from: tinman on September 17, 2016, 11:23:26 PM
And what happens when there is a change in reactance value ?

Reactance has two components, Inductive Reactance (X_L) and Capacitive Reactance (X_C) - So it really does depend on the Circuit and the Frequency with the Circuit's chosen "Values".

For example, when X_L = X_C, each cancel the other, and we have Resonance. But if the X_L is predominant, then the power factor is lagging, inversely, Capacitive Reactance  (X_C), then the power factor is leading.

So, what happens? It depends entirely on the Circuit, and the Frequency, but generally, we see an Impedance (Z), which is measured in Ohms (Ω) - This not entirely a Resistance so its worthy noting that calling this a resistance is not entirely correct, but looking at the definition:

Quote

the effective resistance of an electric circuit or component to alternating current, arising from the combined effects of ohmic resistance and reactance.

Most people think of it as a Resistance.

But why? It, Reactance, is the "Resistance" to Change in the Circuit, Reactance, it reacts, in reverse, to the desired Change.


   Chris Sykes
       hyiq.org

Quote from: tinman on September 17, 2016, 08:05:52 AM
Well since it seems that there is only to be rubbish posted here on this thread,here is some more.

See how poor old Petey struggles to explain his own solenoid motor,and gets it drastically wrong.
Another bathroom heater on display by the Macrame Army

The resistance of the coil stays the same--LOL
These guys really need to learn about changing coil inductance.

https://www.youtube.com/watch?v=4cGg0NK4mjU


Brad

Not a fan of Macrame (sic) Army hence I don't try to defend their actions or research.
But since we are talking about rubbish, I got news: technically speaking, the resistance of a coil does (sorry, I cannot spell it as "dose"), so  the resistance of a coil does change too, does not stay the same --LOL! With temperature! All because I read about bathroom heaters masqueraded as motors.

And since the science police didn't jump to correct the error, I got more news. I don't know where that "50Hz 10KVA Transformer" came up into discussion and I don't think erfinder is wasting his time on that frequency range (although I've seen a demonstration about amplifying harmonics content of a generator spun by hand). However back to the bathroom heater, an iron core will help raise the inductance, but I would ask politely the science police what is an iron core good for when is heated? Think Curie...

As I said, elementary school books. Those still tell the truth but people are selectively twisting the teachings.

As regarding Lenz, erfinder made public demonstrations about circumventing his Law. Who said thanks and then applying what has been learned? One might be gotoluc who took the idea and beat it to death in numerous lengthy tests and at the end ... silence. Nothing. Maybe he is busy now commercializing the idea, what do I know? Did he say thanks? Take a wild guess! Yeah it was a Oompa Loompa science from 19-th century applied by Tesla. But hey, if I didn't hear about that, it must be Oompa Loompa...

Science police... selective and it uses rude criticism.

Quote from: barbosi on September 18, 2016, 01:46:16 AM

As regarding Lenz, erfinder made public demonstrations about circumventing his Law.
Science police... selective and it uses rude criticism.

Erfinder did no such thing--the law stands.


Brad

Quote from: EMJunkie on September 17, 2016, 10:31:18 PM
snip...
The Impedance (Z), is the Sum of the DC Resistance (R) + the Reactance (X), to Current (I) Flow,
snip...

You mean the impedance (Z) (of a series circuit) is equal to the Square Root of the Sum of (Resistance Squared plus the Reactance Squared) Assuming of course that you have already subtracted the XC from the XL (or vice verse, depending on whether XL or XC is the greater value)
Cheers

@Emj

QuoteBut why? It, Reactance, is the "Resistance" to Change in the Circuit, Reactance, it reacts, in reverse, to the desired Change.

On a note of interest, before the term "Reactance" was invented everyone called any resistance to change "Resistance". Which has led to a great deal of confusion when reading old patents because resistance meant ohmic resistance and reactance.


I think the terminology seems skewed, take Inductance for example...
Inductance: is the property of an electrical conductor by which a change in current through it induces an electromotive force in both the conductor itself and in any nearby conductors by mutual inductance.


Is Inductance a property, attribute or component of something which conducts electricity?. I would think it is a property of moving charged particles which produce a changing magnetic field which then produces a force on other charged particles. Yet when we read the definition is gives us literally no insight into what actually happens. For instance by definition we could say charged particles streaming from the Sun have the property of Inductance... what the hell does that mean?. How, why, when and where would seem to be completely missing in action and the term seems meaningless.


Inductance would seem to the property(electrical conduction) of another property (a changing field) of yet another completely different property (an Emf) which then acts on the first supposed property. All lumped into one neat tidy little package which reminds me of a cat chasing it's tail in the dark.


AC