Source google image: https://upload.wikimedia.org/wikipedia/commons/1/16/Sch%C3%A9ma_%C3%A9lectrique_-_alimentation_sans_interruption.jpg
Schema electrique del
Source google image: https://upload.wikimedia.org/wikipedia/commons/1/16/Sch%C3%A9ma_%C3%A9lectrique_-_alimentation_sans_interruption.jpg