69 CS651 Lecture Notes - Lecture 3: Current Density, Drift Velocity, Unit Cube
31 Mar 2023
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It is the inverse of specific resistance for a conductor whereas the specific resistance is the resistance of unit cube of the material of the conductor. Where is the conductivity and is resistivity: si unit of conductivity: The si unit of conductivity is mhom-1: current through a given area of a conductor: It is the net charge passing per unit time through the area: current density vector: (cid:1)(cid:2) The current density vector j gives current per unit area flowing through area a when it is held normal to the direction of charge flow. Note that the direction of j direction of current flow. is in the (cid:1)(cid:2: current density: Current density j gives the amount of charge flowing per second per unit area normal to the flow. J nqv d where n is the number density (number per unit volume) of charge carriers each of charge q and vd is the drift velocity of the charge carriers.
