Photovoltaics years in Northern Europe. The term "photovoltaic" comes from the Greek φῶς ("phōs") meaning "light", and from "volt", the unit of electro-motive force, the volt, which in turn comes from the last name of the Italian physicist Alessandro Volta, inventor of the battery (electrochemical cell). The term "photo-voltaic" has been in use in English since 1849. Photovoltaics are best known as a method for generating electric power by using solar cells to convert energy from the sun into a flow of electrons by the photovoltaic effect. Solar cells produce direct current electricity from sunlight which can be used to power
University of Pavia that immediately preceded the Unification (1859–66). During the following centuries, through periods of both adversity and prosperity, the fame of the University of Pavia grew over the last years due to the large number of applicants. Throughout its history, the university has benefited from the presence of many learned men and distinguished scientists who wrote celebrated works and made important discoveries: mathematician Girolamo Cardano (born in Pavia, 1501–76), physicist Alessandro Volta (Pavia chair of natural philosophy 1769-1804), poet Ugo Foscolo (chair of Italian eloquence 1809-10). Three Nobel Prize winners also taught in Pavia: physician Camillo Golgi (at Pavia from 1861),