An electrode at which oxidation occurs, producing free electrons that move to the cathode.

An instrument that measures electric current in amperes.

The smallest unit of an element, consisting of a dense, positively-charged nucleus surrounded by electrons.

A substance that produces hydrogen ions (H+) when it is dissolved in water.

An electric current that reverses direction at regular intervals. Abbreviated as AC.

A homogeneous mixture of two or more metals, or of metallic and nonmetallic elements, usually fused together or dissolving into each other when molten, and producing a substance with metallic properties.

A substance that produces hydroxide ions (OH–) when it is dissolved in water; ammonia (NH3) forms ammonium ions (NH4+) when it is dissolved in water.

One or more galvanic cells connected in series.

An ion or group of ions having a positive charge and characteristically moving toward the negative electrode in electrolysis.

The relative ability of a material to conduct electricity.