Source google image: http://geii.iut-troyes.univ-reims.fr/wikigeii/images/thumb/2/29/Sch%C3%A9ma_r%C3%A9gulation.png/300px-Sch%C3%A9ma_r%C3%A9gulation.png
Schema electrique pour un four
Source google image: http://geii.iut-troyes.univ-reims.fr/wikigeii/images/thumb/2/29/Sch%C3%A9ma_r%C3%A9gulation.png/300px-Sch%C3%A9ma_r%C3%A9gulation.png