The Big Misconception About Electricity


This vid goes quite a ways down the road to explaining why:

1)  Power cords make a not so subtle difference.

2) Cable elevators should not be looked at askance.

 

Regards, barts

128x128barts

My wife and sister and maid make video in pool house tonight. All agree that the black mamba sound best and have combination of rigid and size that make good WAF too.

The video isn't relevant to lumped circuits, speakers wires, interconnects etc..

 

 

I don’t agree completely with his answer "D". That is true for a small circuit shown in his diagram but for large circuits inductance comes into play and he even alluded to that. In real life his super large circuit is going to take a lot of voltage to overcome the large inductance of that 1000’s of kilometers of wire. It takes time to build and collapse those E/M fields. Old style incadesent bulbs will start glowing almost immediately even as the voltage is building once the switch is closed but LED bulbs will not light up below a certain voltage. I notice that when I flip a switch in a room now it takes a brief moment for the LED bulbs to turn on.

Also, he mentioned that high tension (ie voltage) lines are suspended high in the air to keep away from the damp earth. Isn’t it also due to iron in the earth which would increase the impedance and/or inductance of the wires? Our neighborhood power lines are underground but the high tension wires remain above ground.

PS. I’m a mechanical engineer talking about electricity, I know. But if you all start making fun of me then I’ll start talking about electrical engineers who design electrical connectors.

Looking at the comment above, another interesting thing occurs, a side point of interest....with the various qualities of inductance as tied to inductor build and design. In the pure physics of the electric aspect as tied to inductor physical build. regarding the electron phenomena as we consider it, in atomic level physics, and the concept of inductance.

(the way we usually use electricity in engineering analysis takes none of this into consideration, thus some of the critical subtleties we deal with in audio are not taken into account in the analysis we see happening on forums)

Where above the knee or peak of the Q of an inductor, that the given inductor is a better quality of capacitor than an outright ’bog standard’ capacitor.

Which is only one small point of note to help clarify that most (OK, all) engineering analysis uses lumped or simplified parameters or simplified explanations where the originating atomic and hard/core physics levels of explanations of the underlying physics of electricity --- goes missing, it is MIA. by choice, by necessity, otherwise nothing could be built, the analysis would be too complex and for the most part, unnecessary to the given physical task at hand that is to be engineered.

Such a statement (about inductors) would require careful unpacking, of course. I leave it up to the given reader to pursue such on their own.....

It comes back to that general ’truism’ that I put out there at times, which goes like: "The longer the problem sits unresolved, the more fundamental the error in the formulation of the question."