ampere per square metre
|m−2 A||current density|
The ampere per square metre, symbol m−2 A, is the SI coherent derived unit of current density.
Current density is the electric current per unit area of cross section.
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 charges at this point.