Galvanostat

A galvanostat (also known as amperostat) is a control and measuring device capable of keeping the current through an electrolytic cell in coulometric titrations constant, disregarding changes in the load itself.Its main feature is its nearly "infinite" (i.e. extremely high in respect to common loads) internal resistance.The simpler galvanostat consists of a high-voltage source producing a constant voltageas follows This simple realization requires rather high voltages (~100 V) to keep the load current constant with sufficient approximation for all practical purposes.Therefore, more complex versions of galvanostats, using electronic amplifiers with feedback and lower voltages, have been developed and produced.
controlmeasuringcurrentelectrolytic cellcoulometrictitrationsinternal resistanceelectrochemistryconstant current sourcesmeasurecurrentspicoamperesamperesboth polaritiesresistanceOhm's lawvoltagefeedbackoperational amplifiersCurrent sourcePotentiostat