define current density and conductance
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current density-electric current per unit area of cross section
conductance is the ability of a substance to allow electric current to pass through it in relation to the applied voltage
conductance is the ability of a substance to allow electric current to pass through it in relation to the applied voltage
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Conductivity is defined as, "the reciprocal of resistivity." Its unit is siemen metre−1 or mho metre−1. σ=1ρ Current density is defined as the amount of current flowing per unit area of the conductor perpendicular to the flow of the current, that is J=IA. It is a vector quantity and its SI unit is A m−2.
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