{"id":152,"date":"2019-12-27T23:03:33","date_gmt":"2019-12-27T22:03:33","guid":{"rendered":"https:\/\/www.liceoalessandrovolta.edu.it\/measurement\/?page_id=152"},"modified":"2019-12-27T23:03:33","modified_gmt":"2019-12-27T22:03:33","slug":"6-generatore-di-van-de-graaff","status":"publish","type":"page","link":"https:\/\/www.liceoalessandrovolta.edu.it\/measurement\/6-generatore-di-van-de-graaff\/","title":{"rendered":"6.  Generatore di Van de Graaff"},"content":{"rendered":"\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"172\" height=\"300\" src=\"https:\/\/www.liceoalessandrovolta.edu.it\/measurement\/wp-content\/uploads\/2019\/12\/20191221_112816-1-172x300.jpg\" alt=\"\" class=\"wp-image-153\" srcset=\"https:\/\/www.liceoalessandrovolta.edu.it\/measurement\/wp-content\/uploads\/2019\/12\/20191221_112816-1-172x300.jpg 172w, https:\/\/www.liceoalessandrovolta.edu.it\/measurement\/wp-content\/uploads\/2019\/12\/20191221_112816-1-768x1336.jpg 768w, https:\/\/www.liceoalessandrovolta.edu.it\/measurement\/wp-content\/uploads\/2019\/12\/20191221_112816-1-589x1024.jpg 589w\" sizes=\"(max-width: 172px) 100vw, 172px\" \/><\/figure>\n\n\n\n<p><strong>IT<\/strong> &#8211; \u00c8 un generatore elettrostatico, ideato intorno al 1930 dall\u2019ingegnere americano Robert Jemison Van de Graaff, che permette di accumulare un\u2019elevata quantit\u00e0 di carica elettrostatica. Una colonna di materiale isolante sostiene una grande sfera metallica cava; nella colonna scorre una cinghia flessibile di gomma, tesa tra due pulegge e mantenuta in rotazione da un motore. La cinghia in movimento, elettrizzata per strofinio, permette di caricare la superficie esterna della sfera conduttrice. La carica elettrostatica accumulata genera un campo elettrico che va a ionizzare l\u2019aria circostante, producendo scariche verso altri conduttori presenti in prossimit\u00e0. La differenza di potenziale tra la sfera e il suolo pu\u00f2 raggiungere 100 kV: dato che la quantit\u00e0 di cariche implicate nel processo \u00e8 piccola, non vi \u00e8 alcun rischio per la persona.<\/p>\n\n\n\n<p><strong>GB<\/strong> &#8211; Van de Graaff generator &#8211; It is an electrostatic generator, conceived around 1930 by the American engineer Robert Jemison Van de Graaff, which permits the accumulation of a high quantity of electrostatic charge. A column of insulating material supports a large hollow metal sphere; a flexible rubber belt runs in the column, stretched between two pulleys and kept in rotation by a motor. The moving belt, electrified by rubbing, allows it to load the external surface of the conductive sphere. The accumulated electrostatic charge generates an electric field that ionizes the surrounding air, producing discharges towards other conductors in proximity. The potential difference between the sphere and the ground can reach 100 kV but since the quantity of charges involved in the process is small, there is no risk for the person operating the generator.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>IT &#8211; \u00c8 un generatore elettrostatico, ideato intorno al 1930 dall\u2019ingegnere americano Robert Jemison Van de Graaff, che permette di accumulare un\u2019elevata quantit\u00e0 di carica elettrostatica. Una colonna di materiale&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"_links":{"self":[{"href":"https:\/\/www.liceoalessandrovolta.edu.it\/measurement\/wp-json\/wp\/v2\/pages\/152"}],"collection":[{"href":"https:\/\/www.liceoalessandrovolta.edu.it\/measurement\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.liceoalessandrovolta.edu.it\/measurement\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.liceoalessandrovolta.edu.it\/measurement\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.liceoalessandrovolta.edu.it\/measurement\/wp-json\/wp\/v2\/comments?post=152"}],"version-history":[{"count":1,"href":"https:\/\/www.liceoalessandrovolta.edu.it\/measurement\/wp-json\/wp\/v2\/pages\/152\/revisions"}],"predecessor-version":[{"id":155,"href":"https:\/\/www.liceoalessandrovolta.edu.it\/measurement\/wp-json\/wp\/v2\/pages\/152\/revisions\/155"}],"wp:attachment":[{"href":"https:\/\/www.liceoalessandrovolta.edu.it\/measurement\/wp-json\/wp\/v2\/media?parent=152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}