Electrode

noun (countable)

/ɪˈlektrəʊd/

An electrode is an electrical conductor through which electric current enters or leaves an electrolyte, vacuum, or semiconductor; the anode is the positive electrode (site of oxidation), and the cathode is the negative electrode (site of reduction) in an electrolytic cell. In galvanic cells, the convention is reversed: the anode is negative. Electrodes are central to electrochemical processes including electrolysis, batteries, and fuel cells. India's push toward electric vehicles under the FAME-II scheme (Faster Adoption and Manufacturing of Hybrid and Electric Vehicles) and the PLI scheme for Advanced Chemistry Cell batteries makes electrode materials science — particularly lithium, cobalt, and sodium-ion electrode research — a strategic priority.

✍️ Usage in a UPSC answer

India's Production-Linked Incentive scheme for Advanced Chemistry Cell batteries incentivises domestic manufacturing of lithium-ion electrode assemblies, aiming to reduce dependency on Chinese imports and anchor an indigenous electric-vehicle supply chain.

Synonyms

terminal (general)anode/cathode (specific)conductor terminalpole (archaic)

Antonyms

insulatordielectricnon-conductor

🌱 Word Family

electrolyte (noun), electrolysis (noun), electrolytic (adjective), electrode potential (noun phrase), electrodeposition (noun)

🔡 Root

Greek ēlektron = amber (source of static electricity concept) + hodos = way, path

📜 Etymology

The term was coined by English polymath William Whewell in 1834 at the suggestion of Michael Faraday, combining Greek ēlektron (amber, from which static electricity was first observed by the Greeks) and hodos (way, road, path), meaning 'the way (through which) electricity (travels)'. Faraday also used Whewell's coinages 'anode', 'cathode', 'ion', and 'electrolyte' at the same time, all built from Greek roots to describe the phenomena of electrolysis.

🧠 Memory Hook

Electrode = electro (electricity) + hodos (road/path) — it is the 'electric road', the gateway through which current enters or exits. Picture electricity as a highway traveller, and the electrode as the toll gate where it crosses between the wire world and the chemical world.

⚗️ General Science 📖 Seen in: Human Body Systems — Organ Systems, Ph...

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