Electric Currents In Conductors
Electric charge will always experience a force when placed in an Electric Field. Whenever an electric charge is moving it will always contribute to current formation. Unlike the electrons in atoms and molecules which are bound to each other through nuclear forces cannot contribute to electric current. However a free electron in an conductor when in motion will develop an electric current.
Whenever a charge is present in a conductor, upon applying an electric field, charges will be set in motion thus developing an electric current
In above diagram, on side of conductor there is Q+ positive charge disk and on other end is Q- negative charge disk. Upon applying electric field E, electrons flow from Q- to Q+.