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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: RE: Really? posted by jea48 on February 23, 2022 at 12:07:23:
For most audio cables there is one conductor per side, + and -. The electrons move in one direction on one conductor while simultaneously moving in the opposite direction on the other wire. Electrons switch direction according to the alternation rate of the audio waveform. It's the alternation of electron flow that ultimately produces sound in speakers, that moves the diaphragm back and forth.Even though electrons move very slowly they change directions very rapidly, according to the instantaneous audio waveform, 20-20k Hz. That's why I said somewhere recently electrons travel only about a millionth of an inch at a time. In any case, this is the core of the audio signal in cables, the alternating electron motion on both + and - conductors, which in turn creates moving charges, I.e., current.
The audio waveform of course originates at the source and is amplified along the way. The electrons do a little dance, the wiggle wiggle dance, to the tune of the audio waveform.
Alternating current and alternating voltage produce the magnetic fields and the electric fields, . The Poynting vector is simply the cross product of those two fields. The Poynting vector also alternates direction along with the audio waveform. You can forget about speed of light. That is only a red herring. In fact, this discussion is really about low speed physics, not high speed physics since electrons move only about a meter per hour.
Edits: 02/23/22 02/23/22 02/23/22
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Follow Ups
- RE: Really? - geoffkait 12:57:54 02/23/22 (2)
- Ralph Morrison would strongly disagree... - jea48 13:34:00 02/23/22 (1)
- Actually he agrees with me - geoffkait 17:07:24 02/23/22 (0)
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