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
Italian unification landscapes, rural scenes, and military life during the Italian unification. In literature, lots of works were dedicated to Risorgimento since the beginning. The most known writer of Risorgimento is Alessandro Manzoni whose works are a symbol of the Italian unification, both for its patriotic message and because of his efforts in the development of the modern, unified Italian language; he is famous for the novel "The Betrothed" (orig. Italian: "I Promessi Sposi") (1827), generally ranked among the masterpieces of world literature. Vittorio Alfieri, was the founder of a new school in the Italian drama, expressed in several occasions his suffering