Скачать или смотреть Current density, Conductivity and Conductance | Current electricity | 12th physics

In this Physics video lecture we explained current density and related it with electric current and cross sectional area. Electric current is the dot product of the current density and the surface vector. Current density is a vector quantity. Current density can be defined as the current per unit area. So it is the ratio of electric current to the cross sectional area normal to the direction of current.

Current Density is defined as the electric current per unit cross-sectional area (area normal to current ) at any point in a conductor.
Consider a wire of cross-sectional area A and carrying current I. In this case, the current density is constant for all points within the conductor. The magnitude of current density is given by ;
               Current density , J = I/A


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What is current density, #currentdensity 

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