Every metal coductor has large number of free electrons which move at random at room temperature. Their average thermal velocity at any instant is zero. When a pot. Diff. is applied across the ends of the conductor, an electic field is set up in the conductor. Due to it, the free electrons of the condutor experience force due to electic field and drift towards the positive end of the coductor, causing the electric current (i.e., conduction current) in the conductor. The direction of conventional current is opposite to the direction of motion of the free electrons in the conductor.
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