Linear Electric Current Density
"Linear Electric Linear Current Density" is the electric current per unit length. Electric current, $I$, through a curve $C$ is defined as $I = \int_C J _s \times e_n$, where $e_n$ is a unit vector perpendicular to the surface and line vector element, and $dr$ is the differential of position vector $r$.
Applicable units are those of quantitykind:LinearElectricCurrentDensity
http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=31891
http://www.asknumbers.com/ElectricalConversion.aspx
$J_s = \rho_A v$, where $\rho_A$ is surface density of electric charge and $v$ is velocity.