The term ELECTRICITY UNIT can be summarized as a unit of measurement for electricity, and the crossword solution for this term is VOLT, which is a four-letter word. The volt is a derived unit of electric potential, electric potential difference, and electromotive force. It is named after the Italian physicist Alessandro Volta (1745–1827). The volt is the SI derived unit for electric potential, electric potential difference, and electromotive force. It is also the unit for the energy per unit charge of an electric circuit or electrical system.