Generally rotational flow around an axis. An electrical eddy current is induced in conductors by fluctuating magnetic fields (caused by current flow) in those conductors. The current moves in a circular direction, like river eddies, just below the surface of the material. Eddy currents can, at times, be disruptive or cause minor interferences with the transmission of the desired signal. Sometimes they can be disrupted by imperfections, dimensional changes, or changes in the material’s conductive and permeability properties. They are also sometimes called Foucault currents.