{"id":209980,"date":"2024-09-04T18:32:34","date_gmt":"2024-09-04T18:32:34","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/?p=209980"},"modified":"2024-09-04T18:32:34","modified_gmt":"2024-09-04T18:32:34","slug":"quest-ce-quun-pont-de-wheatstone-2","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/fr\/quest-ce-quun-pont-de-wheatstone-2\/","title":{"rendered":"Qu&rsquo;est-ce qu&rsquo;un pont de Wheatstone ?"},"content":{"rendered":"<p class=\"sidekick\">Un pont de Wheatstone est un circuit utilis\u00e9 pour mesurer de mani\u00e8re pr\u00e9cise des r\u00e9sistances \u00e9lectriques inconnues en utilisant des r\u00e9sistances connues et un galvanom\u00e8tre.<\/p>\n<h2>Qu&rsquo;est-ce qu&rsquo;un pont de Wheatstone ?<\/h2>\n<p>Un pont de Wheatstone est un appareil utilis\u00e9 en \u00e9lectricit\u00e9 et en \u00e9lectronique pour mesurer des r\u00e9sistances \u00e9lectriques avec une grande pr\u00e9cision. Il a \u00e9t\u00e9 invent\u00e9 par le scientifique britannique Samuel Hunter Christie en 1833 et perfectionn\u00e9 par Sir Charles Wheatstone en 1843.<\/p>\n<h2>Principe de fonctionnement<\/h2>\n<p>Le pont de Wheatstone se compose de quatre r\u00e9sistances connect\u00e9es en forme de losange, avec une source de tension appliqu\u00e9e entre deux points oppos\u00e9s et un galvanom\u00e8tre (un appareil de mesure de courant) connect\u00e9 entre les deux autres points. Les quatre r\u00e9sistances sont d\u00e9sign\u00e9es comme suit:<\/p>\n<ul>\n<li>R<sub>1<\/sub><\/li>\n<li>R<sub>2<\/sub><\/li>\n<li>R<sub>3<\/sub><\/li>\n<li>R<sub>4<\/sub><\/li>\n<\/ul>\n<p>Le pont est \u00e9quilibr\u00e9 lorsque le rapport des r\u00e9sistances dans les deux branches est \u00e9gal:<\/p>\n<p>\n    \\[<br \/>\n    \\frac{R_1}{R_2} = \\frac{R_3}{R_4}<br \/>\n    \\]\n<\/p>\n<p>Dans cette situation, le galvanom\u00e8tre ne montre aucune d\u00e9viation indiquant qu&rsquo;il n&rsquo;y a pas de courant qui circule \u00e0 travers lui. Cela permet de d\u00e9terminer la valeur inconnue d&rsquo;une des r\u00e9sistances si les trois autres sont connues.<\/p>\n<h2>Applications<\/h2>\n<p>Le pont de Wheatstone est largement utilis\u00e9 dans divers domaines, notamment :<\/p>\n<ul>\n<li><strong>Mesure de pr\u00e9cision :<\/strong> Utilis\u00e9 dans les laboratoires pour mesurer de petites r\u00e9sistances.<\/li>\n<li><strong>Capteurs :<\/strong> Adapt\u00e9 aux capteurs pour d\u00e9tecter des changements physiques comme la temp\u00e9rature, la pression ou la d\u00e9formation.<\/li>\n<li><strong>Calibration :<\/strong> Utilis\u00e9 pour calibrer d&rsquo;autres instruments de mesure de r\u00e9sistance.<\/li>\n<\/ul>\n<h2>Conclusion<\/h2>\n<p>Le pont de Wheatstone reste un outil fondamental dans le domaine de l&rsquo;\u00e9lectronique et de l&rsquo;ing\u00e9nierie \u00e9lectrique. Sa capacit\u00e9 \u00e0 mesurer des r\u00e9sistances avec une grande pr\u00e9cision le rend indispensable dans de nombreuses applications pratiques, allant des laboratoires de recherche aux syst\u00e8mes de capteurs industriels.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un pont de Wheatstone est un circuit utilis\u00e9 pour mesurer de mani\u00e8re pr\u00e9cise des r\u00e9sistances \u00e9lectriques inconnues en utilisant des r\u00e9sistances connues et un galvanom\u00e8tre.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[98],"tags":[],"class_list":["post-209980","post","type-post","status-publish","format-standard","hentry","category-des-questions","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - 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