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General Asylum General audio topics that don't fit into specific categories. |
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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: RE: I Like To Think Of Electron Flow As A "Stadium Wave"... posted by rivervalley817 on November 3, 2021 at 20:16:58:
OK, let's summarize what we've learned.Electrons carry the charge in audio cables and wires.
Audio circuits are almost always alternating current AC. In AC power cords the rate at which the electrons alternate direction is 60 Hz. In audio cables and wires the rate of alternation is determined by the instantaneous audio frequencies.
Current is a measure of number of electrons that pass a point on the conductor per unit time. This partially explains why high current power cords are generally very thick since more electrons can move from pt. A to pt. B.
In audio cables like speaker cables electrons reverse direction as the audio frequencies dictate. So electrons change direction as often as 20,000 times a second or more.
(Free) Electron drift velocity is about 1 meter per hour in a copper conductor. This velocity is 1/100 inch per second. Recall only photons can travel at velocity c anyway, but I digress.
Electrons move on + and - wires in opposite directions simultaneously.
This means that for audio frequency of 5,000 Hz cycles per second, electrons move only 1/100 in/sec divided by 2500 (number of times electrons reverse direction per cycle) = 1/250000 inch = 1/4 of a millionth of an inch. For higher frequencies the distance would obviously be even less.
So, anyway, electrons move back and forth on each + and - wire or cable, thus their net velocity over time is zero, or approximately zero to account for quantum effects.
So, with that in mind, can we agree that for all practical purposes electrons don't move in an audio cable?
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