{"id":11319,"date":"2022-02-15T11:06:37","date_gmt":"2022-02-15T11:06:37","guid":{"rendered":"https:\/\/summitinterconnect.ca\/blog\/article\/loi-de-puissance-de-joule\/"},"modified":"2025-12-17T10:49:09","modified_gmt":"2025-12-17T10:49:09","slug":"joules-power-law","status":"publish","type":"post","link":"https:\/\/summitinterconnect.ca\/fr\/blog\/article\/joules-power-law\/","title":{"rendered":"Loi de puissance de Joule"},"content":{"rendered":"

Une approche quantitative de la puissance<\/h2>\n

En 1841, James Prescott Joule a fabriqu\u00e9 des r\u00e9sistances en enroulant des fils autour de tiges de verre. Cela s'est produit deux d\u00e9cennies apr\u00e8s les exp\u00e9riences de Georg Ohm sur les longueurs de fil, et avant que le travail d'Ohm ne soit transform\u00e9 en ce que nous connaissons aujourd'hui sous le nom de loi d'Ohm. Joule a maintenu un diam\u00e8tre de fil constant et a fait varier le nombre d\u2019enroulements. Il connaissait le rapport des r\u00e9sistances avec pr\u00e9cision, m\u00eame sans conna\u00eetre la r\u00e9sistance exacte de chaque fil. Joule a immerg\u00e9 ses r\u00e9sistances \u00e0 fil enroul\u00e9 dans des r\u00e9cipients d\u2019eau et les a connect\u00e9es en s\u00e9rie avec un galvanom\u00e8tre tangentiel et une pile volta\u00efque (batterie).<\/p>\n

Le r\u00e9sultat de l\u2019exp\u00e9rience de Joule est la relation bien connue entre la chaleur, la r\u00e9sistance et le courant.[1]<\/sup><\/a><\/p>

\"\"<\/figure>

O\u00f9 Q est la chaleur d\u00e9livr\u00e9e \u00e0 l'eau, I est le courant (mesur\u00e9 avec un galvanom\u00e8tre) et R est la r\u00e9sistance de la r\u00e9sistance bobin\u00e9e.<\/p>\n

La loi d'Ohm telle que nous la connaissons aujourd'hui<\/h2>\n

Ce n'est qu'en 1849 que Gustav Kirchoff a r\u00e9\u00e9crit les conclusions de l'exp\u00e9rience d'Ohm en r\u00e9alisant que \u03c4 est le courant, a est \u2206V et b+x est la r\u00e9sistance du syst\u00e8me R.<\/p>\n

L'exp\u00e9rience de Joule est ind\u00e9pendante de l'exp\u00e9rience d'Ohm.<\/p>

\"\"<\/figure>

Notes de bas de page :<\/p>\n

(1) Page 202 de la section 7.6 de \u00ab\u00a0Enseignement de la physique d'introduction\u00a0\u00bb d'Arnold Aron https:\/\/books.google.com\/books?id=HpTuAAAAMAAJ<\/p>","protected":false},"excerpt":{"rendered":"

Une approche quantitative de la puissance En 1841, James Prescott Joule a fabriqu\u00e9 des r\u00e9sistances en enroulant des fils autour de tiges de verre. Cela s'est produit deux d\u00e9cennies apr\u00e8s les exp\u00e9riences de Georg Ohm sur les longueurs de fil, et avant que le travail d'Ohm ne soit transform\u00e9 en ce que nous connaissons aujourd'hui […]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[87],"tags":[92,93,91],"class_list":["post-11319","post","type-post","status-publish","format-standard","hentry","category-theorie","tag-fabrication","tag-plate-forme","tag-projet"],"acf":[],"yoast_head":"\nLoi de puissance de Joule - Summit Interconnect CA<\/title>\n<meta name=\"description\" content=\"Summit Interconnect, une soci\u00e9t\u00e9 de fabrication de circuits imprim\u00e9s, explique le concept de la loi de puissance de Joule et ses applications dans les processus de fabrication de circuits imprim\u00e9s Quick Turn.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/summitinterconnect.ca\/fr\/blog\/article\/joules-power-law\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Loi de puissance de Joule - 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