An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit (e.g. a semiconductor, an electrolyte, a vacuum or air). An essential part of a battery. It can consist of a variety of materials depending on the type of battery.

Electrodes used in shielded metal arc welding

The electrophore, invented by Johan Wilcke, was an early version of an electrode used to study static electricity.[1]

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