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Symmetric circuit (or not) then to a more difficult question
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Old 13th July 2019, 11:55 AM   #21
DF96 is offline DF96  England
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I wondered what the point of this thread was going to turn out to be, having started so badly with the OP making false and confused statements about simple circuits, and I wondered where I had come across him before. Thanks to Scottmoose for reminding me.
 
Old 13th July 2019, 12:15 PM   #22
forr is offline forr  France
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To define a symetry between two potentials, a third potential is needed.
The voltage at the connections of a little single element 1.5 V battery is never said to be symetrical. It is floating.
 
Old 13th July 2019, 08:19 PM   #23
ubergeeknz is online now ubergeeknz  New Zealand
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Quote:
Originally Posted by forr View Post
To define a symetry between two potentials, a third potential is needed.
The voltage at the connections of a little single element 1.5 V battery is never said to be symetrical. It is floating.
Don't bother, this thread was about "directional" wire all along
 
Old 13th July 2019, 09:42 PM   #24
PRR is offline PRR  United States
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Quote:
Originally Posted by andy2 View Post
...you measure the current at any point on the cable, the current is the same...
No it is not.

Every cable has both series resistance and shunt resistance. Polyethylene is not a perfect insulator; nothing is (not even empty space).

Say you start from 8V 1 Amp into the cable. And say the cable has the (unlikely large) leakage of 8,000 Ohms per yard, and cable is 5 yards. You actually get 0.995A to the load and 5mA leaking through the poly.

(Actually the voltage is dropping so the mA/yard falls off, but in a "reasonable" cable this is small.)

Since you are interested in the subject, I assume by now you can work the
Telegrapher's Equation
backward and forward.
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Old 14th July 2019, 12:56 AM   #25
andy2 is offline andy2  United States
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For audio freq., the leakage current from the conductor to ground (through dielectric material) is fairly small unless it is a really badly designed cable. Conceptually, the current in a loop is the same. For high freq., sure there are parasitic paths that the current can flow that can be hard to predict but the current has to obey the loop rule or the sum at any node should be zero.

Anyway, what you said interesting (and it will make the haters in this thread here frown) is that even the AC current is directional because like you said, the current starts out high then due to loses, it will be less and less at the load due to leakage and other stuffs. So even the current is AC, it is not symmetric. So now you just prove that even AC current is directional

Last edited by andy2; 14th July 2019 at 01:01 AM.
 
Old 14th July 2019, 01:06 AM   #26
ubergeeknz is online now ubergeeknz  New Zealand
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ahh, but you said 1+1=2, therefore bananas are apples!
Is not an argument...
 
Old 14th July 2019, 01:41 AM   #27
andy2 is offline andy2  United States
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If she said so ...
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Old 14th July 2019, 03:10 AM   #28
PRR is offline PRR  United States
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Originally Posted by andy2 View Post
...So now you just prove that even AC current is directional
Your understanding of directionality and symmetry is too transcendental for me.
 
Old 14th July 2019, 06:03 AM   #29
jazbo8 is offline jazbo8
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