In this way he discovered the electrochemical series , and the law that the electromotive force ( emf ) of a galvanic cell , consisting of a pair of metal electrodes separated by electrolyte , is the difference between their two electrode potentials ( thus , two identical electrodes and a common electrolyte give zero net emf ) .
In this way he discovered Volta 's Law of the electrochemical series , and the law that the electromotive force ( emf ) of a galvanic cell .