CoachAn electrochemical cell is two half-cells, each made of a couple and an electronic conductor, the electrode, joined by an ionic conductor, often a salt bridge (a gel or tube of a concentrated inert salt such as potassium nitrate). The electrode where oxidation takes place is the anode, the one where reduction takes place the cathode. The cell voltage is the difference of electric potential between the two electrodes, positive pole minus negative pole, measured when no current flows.
