Symmetric circuit (or not) then to a more difficult question
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 The Lounge A place to talk about almost anything but politics and religion.

 Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
 13th July 2019, 11:55 AM #21 DF96   diyAudio Member   Join Date: May 2007 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.
 13th July 2019, 12:15 PM #22 forr   diyAudio Member     Join Date: Dec 2004 Location: Next door 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.
ubergeeknz
diyAudio Member

Join Date: Aug 2018
Quote:
 Originally Posted by forr 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.

PRR
diyAudio Member

Join Date: Jun 2003
Location: Maine USA
Quote:
 Originally Posted by andy2 ...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.
Attached Images
 shunt-leakage.gif (8.3 KB, 44 views)

 14th July 2019, 12:56 AM #25 andy2   Sin Bin   Join Date: Nov 2004 Location: StupidVille 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.
ubergeeknz
diyAudio Member

Join Date: Aug 2018
Quote:
 ahh, but you said 1+1=2, therefore bananas are apples!
Is not an argument...

andy2
Sin Bin

Join Date: Nov 2004
Location: StupidVille
If she said so ...
Attached Images
 OCD.png (162.7 KB, 32 views)

PRR
diyAudio Member

Join Date: Jun 2003
Location: Maine USA
Quote:
 Originally Posted by andy2 ...So now you just prove that even AC current is directional
Your understanding of directionality and symmetry is too transcendental for me.

 14th July 2019, 06:03 AM #29 jazbo8 diyAudio Moderator     Join Date: Jan 2011 Location: In Transient Thread closed for maintenance.

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Site     Site Announcements     Forum Problems Amplifiers     Solid State     Pass Labs     Tubes / Valves     Chip Amps     Class D     Power Supplies     Headphone Systems Source & Line     Analogue Source     Analog Line Level     Digital Source     Digital Line Level     PC Based Loudspeakers     Multi-Way     Full Range     Subwoofers     Planars & Exotics Live Sound     PA Systems     Instruments and Amps Design & Build     Parts     Equipment & Tools     Construction Tips     Software Tools General Interest     Room Acoustics & Mods     Music     diyAudio.com Articles     Car Audio     Everything Else Member Areas     Introductions     The Lounge     Clubs & Events     In Memoriam The Moving Image Commercial Sector     Swap Meet     Group Buys     The diyAudio Store     Vendor Forums         Vendor's Bazaar         Sonic Craft         Apex Jr         Audio Sector         Acoustic Fun         Chipamp         DIY HiFi Supply         Elekit         Elektor         Mains Cables R Us         Parts Connexion         Planet 10 hifi         Quanghao Audio Design         Siliconray Online Electronics Store         Tubelab     Manufacturers         AKSA         Audio Poutine         Musicaltech         Holton Precision Audio         CSS         exaDevices         Feastrex         GedLee         Head 'n' HiFi - Walter         Heatsink USA         miniDSP         SITO Audio         Twin Audio         Twisted Pear         Wild Burro Audio

 Similar Threads Thread Thread Starter Forum Replies Last Post iKaPls Digital Line Level 3 3rd December 2016 08:19 AM PeteMcK Multi-Way 19 15th April 2016 08:49 PM jpetek Multi-Way 8 20th August 2008 10:50 AM Bricolo Solid State 9 23rd August 2003 03:37 AM

 New To Site? Need Help?

All times are GMT. The time now is 12:59 PM.