When a magnetic flux varies across a solid surface, not just bounded by a conductor as seen in electromagnetic induction, an induced current is created over it as if every surface were composed of a combination of very thin juxtaposed turns.
The name given to these currents is named after the French physicist and astronomer Jean Bernard Léon Foucault, who first showed their existence.
Due to its considerable dimensions, the surface suffers energy dissipation by Joule effect, causing large temperature increase, which makes it possible to use these currents as heaters, for example, in an induction furnace, which have the passing of eddy currents as operation principle.
In electronic circuits where Joule dissipation is highly undesirable as it may damage its components. It is often the use of materials laminated or formed of small plates insulated from each other in order to decrease energy dissipation.