Electric current Theory
An electric current is a stream of electrons or ions moving through an electrical conductor.
In a wire the charge carriers are free electrons. An electric field is required in order to produce electric current. The ends of the wire are connected to the poles of an electrical source (battery), so an electric field is created inside the wire. The field exerts electrical force to electrons causing them to move oriented. Electrical energy is the kinetic energy of the moving electric charges. Sources of electric power convert various forms of energy into electric. Electrical devices convert electrical energy into other forms of energy.