Engineering ElectromagneticsW.H. Hayt Jr. and J. A. BuckChapter 5:Conductors and DielectricsCurrent and Current DensityCurrent is a flux quantity and is defined as:Current density, J, measured in Amps/m2 , yields current in Amps when it is integrated over a cross-sectional area. The assumption would bethat the direction of J is normal to the surface, and so we would write: Current Density as a Vector FieldnIn reality, the direction of current flow may not be normal to the surface in question, so
