Answer: Electric Current
The electric current is the electric charge flow that travels through a material, which can be:
Solid (movement of electrons)
Liquid (movement of ions)
Gas (movement of ions or electrons)
Although in general, the movement of charges is taken as electrons.
In this sense, for electric current to exist, the electrons furthest from the nucleus of the atom of a material, will have to detach and circulate freely between the atoms of the body. Being the unit of this flow of current according to the International System of Units the Ampere (A).
