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Topic: Current density


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In the News (Sun 21 Apr 19)

  
  Current Density
The reason for this is simply that current is a flow of charge per unit time, and it has a direction (the direction the charge is moving in) and so if you consider a plane perpendicular to the direction of flow, the current is exactly the charge going through that plane per unit time.
The most common symbol is simply a J. I guess to differentiate from total current usually denoted I. The "sub c" is probably to distinguish one kind of current from another.
The flow of heat can also be measured by a heat current density, and usually has quite a different symbol (something involving Q, for example).
www.newton.dep.anl.gov /newton/askasci/1993/physics/PHY109.HTM   (185 words)

  
  Controlling current density - Patent 4587458
Current density controlling apparatus, as in claim 1, in which the third electrode is dimensioned to be of comparable size to a typical workpiece.
Current density controlling apparatus, as in claim 1, in which the third electrode is a disc of material which is thick relative to the diameter thereof.
Current density controlling apparatus, as in claim 1, in which the third electrode is supported within the chamber by an electrical conductor which is electrically insulated.
www.freepatentsonline.com /4587458.html   (1400 words)

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