Interconnects, some have directional indicators, why?

My post relates to the proposition that the electromagnetic wave that is the audio signal **in** copper wire or any conductor is comprised of photons, as are all electromagnetic waves.

atmasphere said:

That energy cannot exist without the current flow. You are correct in that electromagnetism is always there but it can’t exist without current! This link might help sort things out for you:

Quote from Link below:

"Those of you who feel that many of the ideas are not mainstream should find a copy of “Standard Handbook for Electrical Engineers” by Donald G. Fink and H. Wayne Beaty.…there is a section entitled, “Electromagnetic Wave Propagation Phenomena.”

“The usually accepted view that the conductor current produces the magnetic field surrounding it must be displaced by the more appropriate one that the electromagnetic field surrounding the conductor produces, through a small drain on the energy supply, the current in the conductor. Although the value of the latter may be used in computing the transmitted energy, one should clearly recognize that physically this current produces only a loss and in no way has a direct part in the phenomenon of power transmission.”

“There it was, right in front of me in black and white! The current does not flow around a loop setting up a magnetic field as I had, along with countless other engineers, been taught in high school and university. It is the other way round. The electric current is but an artifact of a more fundamental entity.”
http://www.prosoundtraining.com/site/synaudcon-library/understanding-electricity-means-understanding...