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Current density
Common symbols	$j \to$ , $J$
In SI base units	A m⁻²
Dimension	[I L⁻²]

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In electromagnetism, current density is the amount of charge per unit time that flows through a unit area of a chosen cross section.^[1] The current density vector is defined as a vector whose magnitude is the electric current per cross-sectional area at a given point in space, its direction being that of the motion of the positive charges at this point. In SI base units, the electric current density is measured in amperes per square metre.^[2]

^ Walker, Jearl; Halliday, David; Resnick, Robert (2014). Fundamentals of physics (10th ed.). Hoboken, NJ: Wiley. p. 749. ISBN 9781118230732. OCLC 950235056.
^ Lerner, R.G.; Trigg, G.L. (1991). Encyclopaedia of Physics (2nd ed.). VHC publishers. ISBN 0895737523.