Talk:Electrical conduction

message: Can anybody tell me what is mechanism of charge decay in case of polymers which are considered as insulators?
It depends on whether the charge is stranded on the surface (as a surface charge), or imbedded within the polymer (as a space charge). 
In the former, stranded surface charges will decay at a rate dependent upon the surface resistivity. However, the surface resistivity of a polymer can be significantly decreased (from the high bulk resistivity of the parent polymer) by applying a thin coating of a hydroscopic substance that absorbs water vapor to form a more conductive surface layer. An example is an "antistatic" soap film. Other surface treatments (chemical or corona) may also markedly decrease the surface resistivity.
In the latter case, the decay time of an internal space charge will be a function of the material's dielectric constant and its bulk resistivity. The decay time constant (Tau, in seconds) is equal to the material's relative dielectric constant (Er) times the free space dielectric constant (8.83x10^{-14} Farad/meter) divided by its bulk resistivity (σ). The imbedded space charge will decay as Q = Q_oe^{-Tau}. For example, for Teflon,  E_r = 2.1 , and σ is about 1x10^{+22}  Ohm-cm, so Tau = 1.85 x 10^{+9} seconds (or about 59 years). Bert 15:59, 28 May 2006 (UTC)
replies: text: nope -lysdexia 09:47, 27 September 2006 (UTC)
thread_title:  Polymer conductivity 

message: I think this section is terribly lacking, but it is now better than it was.  I've done my best, but if you can improve it, please do so.  So much of science is replacing one incorrect description of physical behavior with another which is slightly less so.  The correction I have made is no exception.  
Especially, there needs to be mention made of the electric field travelling through the conductor, as well as the B-field being created and propagating around the outside of the conductor.  I'll fix this shortcoming when I have time, unless someone else wants to do it first.
But, in any circumstance, if you don't understand how conduction works better than I do, please don't change this writeup.  IN ANY EVENT do NOT change it back to the exclusively "it flows like water" model which was here before.  And especially don't change it back to what it was, because whoever speak a English at me from that one is lack English grammer I think so.
Thank you, and I hope we passed the audition.
--SJGooch 32.164.141.211 05:47, 13 August 2007 (UTC)
replies: text: The idea that electrons in a metal "jump" from one atom to the next is completely false. Valence electrons in a metal are delocalised, in the quantum mechanical sense. The wavefunction is "smeared out". They are not strongly bound to the atoms and are free to move throughout the lattice, much like free particles in a vacuum. -- Tim Starling 04:11, 8 September 2007 (UTC)
thread_title:  Anatomy of Electrical Conduction 

message: The mechanism of H+/OH- conduction in H2O could be included either here or as a separate stub entitled the "Grotthus chain mechanism". Does anyone else think this should have an article? Azo bob (talk) 23:27, 26 January 2008 (UTC)
thread_title:  Grotthus Chain Mechanism 

message: The "electrical conduction" section of the wireless energy transfer article implies that this electrical conduction article is the main article to go to for more details about "electrical currents made to flow through naturally existing conductors, specifically the earth, lakes and oceans, and through the atmosphere".
Alas, I don't see any mention of those 4 things in this article.
So is there some other article that discusses electrical current through those 4 things (and the "wireless energy transfer" article should point there instead)?
Or would it be better to add information about those 4 things to this article?
--68.0.124.33 (talk) 16:56, 10 December 2008 (UTC)
thread_title:  earth lakes oceans atmosphere 

message: Electrical conduction is the movement of electrically charged particles through a transmission medium (electrical conductor). The movement of charge constitutes an electric current. The charge transport may result as a response to an electric field, or as a result of a concentration gradient in carrier density, that is, by diffusion . The physical parameters governing this transport depend upon the material.
Conduction in metals and resistors is well described by Ohm's Law, which states that the current is proportional to the applied electric field. The ease with which current density (current per unit area) j appears in a material is measured by the conductivity σ, defined as:
j = σ E 
or its reciprocal resistivity ρ:
j = E / ρ 
Conduction in semiconductor devices may occur by a combination of electric field (drift) and diffusion. The current density is then:
j = σ E + D ∇qn 
with q the elementary charge and n the electron density. The carriers move in the direction of decreasing concentration, so for electrons a positive current results for a positive density gradient. If the carriers are holes, replace electron density n by the negative of the hole density p.
In linear anisotropic materials, σ, ρ and D are tensors.  —Preceding unsigned comment added by 121.247.121.102 (talk) 08:43, 15 January 2010 (UTC)
thread_title:  Electrical conduction 

message: This website should really have some diagras cause some people are stupid and need someone to show them what your talking about on this smarty pants website!  —Preceding unsigned comment added by 72.151.37.157 (talk) 13:23, 6 April 2010 (UTC)
thread_title:  Help 

message: There's a very weird relationship between these two articles. Most of the material that is here seems like it would do better there, and vice versa. I think that a merged article that covered both here, might be a better idea; they're not precisely the same thing, but they're very deeply related.Embrittled (talk) 05:02, 23 November 2012 (UTC)
thread_title:  Electrical conduction versus [[electrical conductor]]