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What is the difference between critical current (Ic) and critical current density (Jc)? How do they relate to one-another?

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A current is charge per unit time. A current density is charge per unit time per unit area, where the area is perpendicular to the current. You can integrate a current density over a surface to get the current flowing through the surface.

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  • $\begingroup$ Does this work with superconductors (sorry I meant to add that to the question) $\endgroup$ – dl19 Oct 12 at 2:37
  • $\begingroup$ As far as I know, the definitions of current and current density are general and apply to any system, $\endgroup$ – G. Smith Oct 12 at 3:28

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