Electrode

An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit. In electrochemical cells, electrodes are essential parts that can consist of a variety of materials (chemicals) depending on the type of cell. An electrode may be called either a cathode or anode according to the direction of the electric current, unrelated to the potential difference between electrodes.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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