Electrode/ɪˈlektrəʊd/ Definition 1 of 3Pro Tip 1/3Circuit Element An electrode is a crucial part of an electrical circuit. Connect the electrode to complete the circuit. Pro Tip 2/3Battery Terminals Electrodes are found on batteries, labeled as '+' (positive) and '-' (negative). Attach red to the positive electrode of the battery. Pro Tip 3/3Connection Point Use 'electrode' when referring to points where wires connect in electrical devices. Solder the wire to the electrode on the device.