Current

A current is any motion of charge from one region to another.
let's assume that there is an electric field E within the conductor, so a
a particle with charge q experiences a force F=qE.

Current is defined to be the amount of charge transfer per unit time. In metals, the moving charge are always(negative)electrons, but in an ionized gas (plasma) or an ionic solution, both electrons and positively charge ion are moving. In a semiconductor material such as germanium or silicon, conduction is partly by electrons and partly by motion of vacancies, also known as holes; these are sites of missing electron and act like positive charges.