Question

Is there any relation between emf and drift speed of electrons in the conductor connected to a battery?

Answer 1

a wire that connect to the amplifier that connected to the battery

Answer 2

The drift velocity of electrons is directly proportional to the potential difference applied across the conductor. Drift velocity vd = V/(ρlne), where V is the potential difference, ρ the specific resistance, l the length of the conductor, n the number of electrons per unit volume of the conductor and e the electronic charge. (Emf is the p.d. when the cell is not supplying any current.)