Interconnects, some have directional indicators, why?

mihorn said:
 I wrote that here to show it can be tested and see the truth while you are guessing negatively.

Please show me one post of mine where I said fuses could not be directional. I do not have any opinion on fuse directionality, one way or the other. I have never personally experimented with fuses. Until proven otherwise I take others at their word they hear differences. As for bypassing the safety fuse in audio equipment I personally would never do that. Even if the piece of equipment sounded better.  I have seen the power of electricity several times in my life time. Never fear it, but you best respect it!

As for wire directionality, I have experimented and have found solid core wire is directional. Especially solid core silver wire. Why is it directional? Who really cares! Lots of theory out there. I just get bent out of shape when someone says the signal is AC and flows back and forth so how could wire possibly be directional.

 
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Geoffkait 12-5-2016
Current traveling down the wire generates a *magnetic field" - that’s the *induced magnetic field* and has absolutely nothing to do with either an em field or the *electromagnetic wave* that is the audio signal. The induced magnetic field is stationary, obeys the right hand rule, whereas the electromagnetic wave (audio signal) travels at near light speed, as I’ve described.

Geoff, I believe this is not correct. It would be more correct for DC, but as you'll realize AC (including audio signals) is continuously changing in both amplitude and polarity. And the magnetic field described by the right hand rule will therefore be continuously changing in both magnitude and direction.

Also, in the context of a signal propagating along a cable I believe it is incorrect to distinguish between an "induced magnetic field" (stationary or otherwise) and the "electromagnetic wave that is the audio signal." There is simply a magnetic field and an electric field. These two fields are what propagate at near light speed.

That said, much of the discussion of these matters, while perhaps of academic interest to a few, IMO has little if any practical relevance.  

Regards,
-- Al

P.S:  My thanks are extended to Marqmike for his gracious if perhaps somewhat premature comment :-)

sorry to say, Al, but I disagree with just about everything you just posted. oh, well...c'est la vie. specifically, as i just got through saying, the induced magnetic field is stationary whereas the electromagnetic field, you know, the thing comprised of photons, is light speed. atmasphere is mixed up and if you wish to defend him it's no skin off my nose. 

Current in the wire is a flow of electric charge. Wire creates magnetic field but transports charges and not the energy. Energy is transferred thru magnetic field from the source to the load.
The load has some voltage drop in it, hence electric field. Together with magnetic field, this brings the energy in. Same way, the source generates voltage and, together with magnetic field, this brings the energy out.
Direction of electromagnetic energy flow is determined by the Poynting vector, E × H, and depends on both voltage polarity (through E) and current direction (through H).
As I understand it, even in DC circuit energy flows from source to load thru the space in direction of Poynting Vector.