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Current density

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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.



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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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