The Physics of Electricity

Those 2 links provide good info, unfortunately nothing that answers my pop quiz question that concerns vibration in cables. The first article is not relevant to vibration in audio systems actually. The subject of the first article is electromagnetically excited acoustic noise, which is a horse of a different color.

To whit,

“Electromagnetically excited acoustic noise is audible sound directly produced by materials vibrating under the excitation of electromagnetic forces. Some examples of electromagnetically excited acoustic noise include the hum of transformers, the whine of some rotating electric machines, or the buzz of fluorescent lamps. The hissing of high voltage transmission lines is due to corona discharge, not magnetism.”

Sorry but a bit more confused than normal....the original post spoke of external vibrations not vibrations in cables.

So maybe defining the terms more strictly might be good eh.

Actually the original post (The Physics of Electricity) asked, what makes an expensive cable better than an inexpensive one, does one “conduct more or better electricity?” The mention of Vibrations came later on. Plus there’s another similar thread that asked the burning question, do vibrations affect inert electronics like solid state amps.

In any event, my pop quiz was do external vibrations affect the signal in cables and if so how? It’s very similar to the question why do external vibrations affect solid state amps? I’m going to help you out. What is needed is to first establish what the audio signal in wires and cables actually is and how vibrations could physically or electrically affect it.

When we talk about electricity and cables, we talk about resistance , capacitance and inductance. Pardon my English. :)
Cable capacity or inductance can differ 10X even. For example, If one cable has 3X bigger capacity then the other, it will sound differently (the current flow will be different using simple words). That’s obvious and clear for everybody I hope. Cables capacity or inductance or resistance depends on materials used for construction (metal, insulator etc.), geometry of the cable. This is the reason why power cables and in general cables sound so differently. There are other factors like vibrations, RF....  that affect cable performance and it depends how well a cable is constructed and that is reflected in price. Signal in power cables is not only 50/60Hz but many other frequencies superimposed that are "smuggled" into the system and contaminate the sound. Some cables filtrate, attenuate RF by their geometry... 
Price tag... hm... more expensive cables are usually better constructed, better materials, better geometry applied and so on. Generally, cables are way overpriced...There are not so expensive cables sounding very good (Lessloss, for example. Louis should buy me a beer :) ) and very expensive cables that suck. Cables are also system dependent and most important..... listener dependent. Listeners preference...... :)