Also found in: Thesaurus, Medical, Legal, Financial, Acronyms, Encyclopedia, Wikipedia.
Related to current density: conductivity, Drift velocity
Symbol j, J The current flowing in a conductor per unit of cross-sectional area perpendicular to the current flow, given in units of amps per meter squared.
(General Physics) the ratio of the electric current flowing at a particular point in a conductor to the cross-sectional area of the conductor taken perpendicular to the current flow at that point. It is measured in amperes per square metre. Symbol: J
the amount of current flowing through a given cross-sectional area in a given time interval: usu. measured in amperes per square centimeter.