This stored energy is called potential energy. If the force bringing the particles together is removed they will fly apart. The potential energy is converted to kinetic energy. Similarly, work is required to move opposite charged particles away from each other. Thus the potential energy is expressed as the product of the two charges divided by the distance between the particles.
Electric current is the flow of charged particles.
This is most commonly found in metallic conductors. In the case of metals electrons move through a rather rigid lattice of metal ions. Metals are characterized by loosely held electrons. In a metal, the electrons are not associated with particular metal ions. They are similar to a gaseous cloud.