Constant Current Electrolysis:

Herein electrode position is carried out through keeping the current constant. Here periodic rise within the applied potential are needed (adjust the potential of the cell) as the electrolysis proceeds.

As display in Figure, the apparatus for constant current electrolysis consists of a suitable cell and a direct current source.  A 6 V storage battery could be used for DC power source.  An ammeter and voltmeter are used to denote the current and applied voltage correspondingly. The voltage applied to the cell is controlled through a resistor. The cathode is commonly cylindrical platinum gauze.

Figure: Apparatus for constant current electrolysis