Practical circuit:
The practical circuit displays other elements of potentiostatic coulometry. The circuit involves a variable voltage source at the noninverting input of the operational amplifier so in which the potentiostat control potential could be varied, a booster amplifier to supply a high currents which are essential, a recorder and an integrator.
Figure: Schematic of a system for potentiostatic coulometry (a) Equivalent circuit (b) resistance within the cell (c) Practical circuit