Current Density

Current density can be defined as the electric current moving across a unit cross sectional area and it is measured in amperes per square meter.

When the electric current is higher that means that the electric density is higher per unit cross-sectional area. Since the electric current generates a magnetic field, higher the current, higher the magnetic field it produces, either AC or DC changing electric current gives rise to an electromagnetic field this is used in signal propagation.

Current density is a vector quantity there for it can be expressed in terms of a direction and magnitude. The perpendicular direction of the electric field along the considered area is used when calculating the current density.

Current Density (J) = (Perpendicular Current across an Area(A) / Cross-sectional Area(m2))

Therefore, the units of current density are A/ m2.

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