Electrodes are devices formed by bringing together multiple phases, measuring the potential difference between these phases. Similar to the term "electrode" being used for carbon rods in arc lamps, the electric connections of heating lamps are also referred to as electrodes. The electrode connected to the negative (-) pole of the generator is called the cathode, where a reduction process takes place. On the other hand, the electrode connected to the positive (+) pole of the generator is called the anode, and an oxidation process always occurs here. The element donating electrons undergoes oxidation, while the element receiving electrons undergoes reduction.