Source= Ratchit
Current does not exist through it unless it has a leakage or a high ESR (equivalent series resistance.
This question may seem a bit pedantic, but I am hoping some thoughtful people will reply. It is often said that AC does not flow through a capacitor or words to that effect. Those writers usually go on to say it just looks like it does.
For example see here:
Source= Ratch
Current does not exist through it unless it has a leakage or a high ESR (equivalent series resistance.
In contrast, it is generally assumed that AC flows through a copper wire. My question for those feeling pedantic on this lovely evening is, "How do you distinguish AC flow through a wire from what 'looks like' AC flow through a capacitor?" Maybe the wrong question is being asked.
ESR doesn't affect whether current is present or not; that part of the statement is plain falacious.
Well, you can fill up one side of the capacitor with blue electrons and the other with red electrons. Then apply an AC current. If you have trouble colouring the electrons, you could try the equivalent experiment using dyed water with a rubber diaphragm in place of the dielectric.@dough83,
What experiment can you propose that will show the difference?
John
I am catching electrons and putting a red dot on them. I will see if they come through. lolWhat experiment can you propose that will show the difference?
I think the lounge is where it belongs, perhaps in chat, but certainly not as an OT tangent to the original thread.
If a moderator sees fit to change it, I am OK with that.
So red dots are more thoughtful and serious?@dougy83
Can you be a little more thoughtful and serious? As best I know, the particles of water in a perfect wave have negligible forward velocity. We are talking electronics, not urology.
If the drift velocity is high enough, how can you argue that the electrons won't make it all the way along the wire?ronsimpson said:Last year there was a long conversation on electrons flowing in a wire. Several people thought electrons don't flow in wires. You put electrons in one end of a wire and different electrons come out the other end. 'no flow'. Either way (wire or cap) electrons in/electrons out. Looks like current flow.
Last year there was a long conversation on electrons flowing in a wire. Several people thought electrons don't flow in wires. You put electrons in one end of a wire and different electrons come out the other end. 'no flow'. Either way (wire or cap) electrons in/electrons out. Looks like current flow.
I am asking about AC, not direct current. Have you considered the effect of "drift velocity" on linear displacement of electrons in a wire?
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What experiment can you propose that will show the difference?
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Please, let's try to stay on topic. You and several others have said that there is no AC flow through a capacitor. Unsaid, but clearly implied is that there is AC flow though a piece of copper wire.
A variety of vague theories have been put forth to support the the first proposition. One cannot show that conduction through both is the same, but those who claim the capacitor doesn't conduct should be able to show there is a difference.
So, boiled down, what experiment can you do to show that AC conduction does not occur through a capacitor, but does occur through a wire?
It is the difference between the practical and the physics.
I for one am to old to worry about the physics but when I look below it makes perfect sense.
Current must flow thru the capacitor (where else could it be going?).
Now we (you) can argue about what kind of current and what color electron. They all look brown to me.
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