What is an electrode?

• A. A device for conducting electricity
• B. A type of battery
• C. A conductor of heat
• D. A chemical reagent

Answer: (A)

An electrode is a conductor that allows electric current to enter or leave a substance in an electrical circuit or electrochemical cell. It’s a component that serves as the entry or exit point for electrons, not a battery itself. While metals can conduct both electricity and heat, the term electrode specifically refers to its role in conducting electricity, not to heating or acting as a reagent. Batteries contain electrodes and electrolyte, but an electrode by itself is not a battery.