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
Alessandro Nesta Alessandro Nesta Alessandro Nesta, (born 19 March 1976) is an Italian professional football manager and former player. He is currently the head coach of Perugia. Widely considered to be one of the best centre backs of his time and also as one of the greatest defenders ever, he was best known for his pace, artistic tackles, elegance on the ball, distribution and tight marking of opponents. He made over 400 Serie A appearances in a 20-year career spread between Lazio and Milan, winning domestic and European honours with both clubs as well as playing in Major League Soccer (MLS) for