Talk:Current density

Typical figure for ordinary wiring?
Would be nice if this article contained a typical figure or range of figures for current density that one might find in an ordinary household wiring setting. Anyone? 24.6.66.193 (talk) 05:00, 29 June 2008 (UTC)


 * Book sources suggest on the order of 107 A/m2 (10 A per square mm, 1000 A per square cm). Dicklyon (talk) 05:21, 29 June 2008 (UTC)

Added some info.
I added some important info about how current density is used in flashlamps. I have recently added some info to the flashlamp article, so I thought it would be helpful to people who will come from there to here to find out more.Zaereth (talk) 00:22, 27 November 2008 (UTC)

Definition problem
The definition on this page is fairly cumbersome. The definition on the current page is actually better. Even worse, current density is the more fundamental concept, yet it's being defined in terms of current. Current should be defined in terms of current density, not the other way around. — Preceding unsigned comment added by 68.149.171.123 (talk) 23:19, 2 October 2013 (UTC)

Symbol confusion
The upper case 'J' is also used for surface current density whose units are [A/m]. Feynman (and others) use the small case 'j' for current density with units [A/m^2]. See: http://www.ittc.ku.edu/~jstiles/220/handouts/Surface%20Current%20Density.pdf — Preceding unsigned comment added by 98.125.160.152 (talk) 14:24, 8 April 2019 (UTC)