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current density |
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current density [′kər·ənt ‚den·səd·ē] (electricity) The current per unit cross-sectional area of a conductor; a specialization of the physics definition. Also known as electric current density. (physics) A vector quantity whose component perpendicular to any surface equals the rate of flow of some conserved, indestructible quantity across that surface per unit area per unit time. Also known as current. Current density A vector quantity equal in magnitude to the instantaneous rate of flow of electric charge, perpendicular to a chosen surface, per unit area per unit time. If a wire of cross-sectional area A carries a current I, the current density J is I/A. The units of J in the rationalized meter-kilogram-second system are amperes per square meter. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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However, there are several issues with current 850-nm-range VCSELs, including operation speed limitations of 10 Gbps due to overheating caused by an increase in current density for faster operation, or decreased reliability due to defects in the crystal. But unlike the current density bonus, the new proposal would not apply citywide. Researchers at NIST, in collaboration with the Max-Planck-Institute for Metals Research, have been conducting fatigue testing of thin aluminum and copper films on silicon-based substrates through the application of high current density ac signals. |
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