A galvanostat is an electronic device used to control the current flowing through an electrochemical cell. It maintains a constant current by adjusting the voltage applied across the cell, making it essential for experiments in fields like electrochemistry and materials science. This instrument is often used in conjunction with a potentiostat, which controls voltage instead of current. Together, they help researchers study reactions and processes at the electrode surface, contributing to advancements in battery technology, corrosion studies, and the development of new materials.