{"id":2382,"date":"2024-11-16T07:54:51","date_gmt":"2024-11-16T07:54:51","guid":{"rendered":"http:\/\/www.wigglewires.com\/?p=2382"},"modified":"2024-11-16T07:55:41","modified_gmt":"2024-11-16T07:55:41","slug":"ac-vs-dc-alternating-current-or-direct-current-which-is-better","status":"publish","type":"post","link":"https:\/\/www.wigglewires.com\/fr\/ac-vs-dc-alternating-current-or-direct-current-which-is-better-article\/","title":{"rendered":"Courant alternatif ou courant continu : Courant alternatif ou courant continu - Qu'est-ce qui est le mieux ?"},"content":{"rendered":"<p>Le courant (charge \u00e9lectrique) ne circule que dans un seul sens dans le cas o\u00f9&nbsp;<strong>CC (courant continu)<\/strong>. Mais dans&nbsp;<strong>CA (courant alternatif)<\/strong>&nbsp;La charge \u00e9lectrique change p\u00e9riodiquement de sens. Non seulement le courant, mais aussi la tension s'inversent en raison de la variation du sens du courant.<\/p>\n\n\n\n<p>Le d\u00e9bat entre le courant alternatif et le courant continu incarne ce qu\u2019on appelle aujourd\u2019hui la \u00ab guerre des courants \u00bb, qui a oppos\u00e9 les deux g\u00e9ants de l\u2019\u00e9lectricit\u00e9 \u00e0 la fin des ann\u00e9es 1890. Thomas Edison, le d\u00e9fenseur du courant continu, se sentait tellement menac\u00e9 par l\u2019invention de Tesla que, pour discr\u00e9diter le courant alternatif, il n\u2019h\u00e9sita pas \u00e0 induire les Am\u00e9ricains en erreur. Craignant de perdre ses redevances au profit de cette nouvelle technologie, Edison alla jusqu\u2019\u00e0 \u00e9lectrocuter un \u00e9l\u00e9phant pour d\u00e9montrer les dangers mortels du courant alternatif.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"524\" src=\"http:\/\/www.wigglewires.com\/wp-content\/uploads\/2024\/11\/AC-motor-9v-battery.webp\" alt=\"\" class=\"wp-image-2383\" srcset=\"https:\/\/www.wigglewires.com\/wp-content\/uploads\/2024\/11\/AC-motor-9v-battery.webp 1024w, https:\/\/www.wigglewires.com\/wp-content\/uploads\/2024\/11\/AC-motor-9v-battery-300x154.webp 300w, https:\/\/www.wigglewires.com\/wp-content\/uploads\/2024\/11\/AC-motor-9v-battery-768x393.webp 768w, https:\/\/www.wigglewires.com\/wp-content\/uploads\/2024\/11\/AC-motor-9v-battery-18x9.webp 18w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Cela n\u2019a toutefois pas emp\u00each\u00e9 Tesla de r\u00e9aliser son r\u00eave : alimenter les \u00c9tats-Unis en \u00e9nergie bon march\u00e9 et hautement efficace. Aujourd\u2019hui encore, on voit de longs et \u00e9pais c\u00e2bles tendus entre des pyl\u00f4nes \u00e9lectriques vertigineux, tels les cordes d\u2019une guitare. Le courant alternatif (CA) a pris le pouvoir et a r\u00e9gn\u00e9 pendant un si\u00e8cle, dominant les foyers, les bureaux et les b\u00e2timents, jusqu\u2019\u00e0 aujourd\u2019hui, o\u00f9 le courant continu (CC) semble faire progressivement son retour. Pourquoi le courant alternatif a-t-il si bien r\u00e9ussi ? Et pourquoi le courant continu pourrait-il faire son retour ? Reformulons ces questions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi le courant alternatif est-il meilleur que le courant continu ?<\/h2>\n\n\n\n<p>Le courant alternatif est un type de courant dans lequel les \u00e9lectrons changent p\u00e9riodiquement de direction, allant et venant. Il repose sur les principes \u00e9labor\u00e9s par Michael Faraday en 1832, lorsqu\u2019il a pr\u00e9sent\u00e9 son g\u00e9n\u00e9rateur \u00e9lectrique \u00e0 dynamo. Malgr\u00e9 sa grande popularit\u00e9, le courant continu pr\u00e9sentait un inconv\u00e9nient majeur : il \u00e9tait tr\u00e8s difficile de le transporter sur de longues distances. Les c\u00e2bles subissaient des pertes de puissance et devaient \u00eatre r\u00e9g\u00e9n\u00e9r\u00e9s \u00e0 l\u2019aide de circuits suppl\u00e9mentaires. De plus, l\u2019augmentation ou la r\u00e9duction des tensions en courant continu n\u00e9cessitait \u00e9galement des circuits complexes.<\/p>\n\n\n\n<p>Non seulement le courant alternatif pouvait \u00eatre facilement transmis sur de longues distances, mais il pouvait \u00e9galement \u00eatre converti de mani\u00e8re pratique en tensions plus \u00e9lev\u00e9es ou plus faibles \u00e0 l\u2019aide de transformateurs. Un transformateur est essentiellement un fil enroul\u00e9 qui \u00ab augmente \u00bb ou \u00ab diminue \u00bb l\u2019amplitude de la tension alternative. La capacit\u00e9 \u00e0 transformer la tension de cette mani\u00e8re permettait de transporter l\u2019\u00e9nergie \u00e9lectrique de mani\u00e8re bien plus efficace, non seulement d\u2019une ville \u00e0 l\u2019autre, mais aussi \u00e0 l\u2019\u00e9chelle du pays tout entier. Le r\u00eave de Tesla devenait peu \u00e0 peu r\u00e9alit\u00e9.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"960\" height=\"593\" src=\"http:\/\/www.wigglewires.com\/wp-content\/uploads\/2024\/11\/overhead-power-lines-electricity-pole.webp\" alt=\"\" class=\"wp-image-2384\" srcset=\"https:\/\/www.wigglewires.com\/wp-content\/uploads\/2024\/11\/overhead-power-lines-electricity-pole.webp 960w, https:\/\/www.wigglewires.com\/wp-content\/uploads\/2024\/11\/overhead-power-lines-electricity-pole-300x185.webp 300w, https:\/\/www.wigglewires.com\/wp-content\/uploads\/2024\/11\/overhead-power-lines-electricity-pole-768x474.webp 768w, https:\/\/www.wigglewires.com\/wp-content\/uploads\/2024\/11\/overhead-power-lines-electricity-pole-18x12.webp 18w\" sizes=\"(max-width: 960px) 100vw, 960px\" \/><\/figure>\n\n\n\n<p>La capacit\u00e9 \u00e0 transporter l'\u00e9lectricit\u00e9 sur de longues distances constituait l'avantage le plus important du courant alternatif (CA) par rapport au courant continu (CC), ce qui a conduit les habitations et les b\u00e2timents \u00e0 abandonner le courant continu d\u00e8s le XIXe si\u00e8cle. En 1893, General Electric fut choisie pour alimenter l\u2019Exposition universelle de Chicago en courant continu, ce qui aurait co\u00fbt\u00e9 la somme exorbitante de $554 000. Cependant, George Westinghouse intervint et promit d\u2019alimenter l\u2019exposition pour seulement $399 000 gr\u00e2ce au courant alternatif de Tesla. Trois ans plus tard, la Niagara Falls Power Company, s\u00e9duite par les avantages du courant alternatif, accorda \u00e0 Westinghouse le droit de produire de l\u2019\u00e9lectricit\u00e9 \u00e0 partir des chutes du Niagara et d\u2019\u00e9clairer toute la ville de Buffalo, dans l\u2019\u00c9tat de New York. Le courant alternatif balaya d\u00e9finitivement le courant continu. Puis, quelques d\u00e9cennies plus tard, le transistor fit son apparition.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi le courant continu est-il meilleur que le courant alternatif ?<\/h2>\n\n\n\n<p>Contrairement au courant alternatif, le courant continu ne subit aucune commutation. Il n\u2019y a pas de phases et le courant circule dans un seul sens avec une tension constante. Comme nous l\u2019avons d\u00e9j\u00e0 mentionn\u00e9, le courant continu a tendance \u00e0 perdre de l\u2019\u00e9nergie sous forme de chaleur \u2013 une caract\u00e9ristique qu\u2019Edison a exploit\u00e9e pour allumer la premi\u00e8re ampoule. Malgr\u00e9 ses inconv\u00e9nients, l\u2019\u00e8re des semi-conducteurs a impos\u00e9 le retour du courant continu. Ce dernier est principalement utilis\u00e9 pour alimenter des appareils \u00e9lectroniques, notamment les plus petits d\u2019entre eux qui ne peuvent fonctionner que selon deux \u00e9tats : allum\u00e9 et \u00e9teint. Cela inclut les batteries, les LED, les transistors \u2013 les neurones de l\u2019informatique \u2013 et tous les autres dispositifs \u00e0 semi-conducteurs.<\/p>\n\n\n\n<p>Le courant continu fait son grand retour en raison de la d\u00e9pendance de notre soci\u00e9t\u00e9 vis-\u00e0-vis des ordinateurs, des tablettes et des appareils portables connect\u00e9s en permanence au \u00ab cloud \u00bb. Les \u00ab clouds \u00bb sont essentiellement des ordinateurs, officiellement appel\u00e9s serveurs, install\u00e9s dans des b\u00e2timents distants pour stocker vos pr\u00e9cieuses donn\u00e9es. Aujourd\u2019hui, des entreprises comme Facebook et Google consacrent des b\u00e2timents entiers \u00e0 l\u2019h\u00e9bergement de serveurs qui stockent les donn\u00e9es d\u2019un nombre d\u2019utilisateurs en constante augmentation. G\u00e9rer le courant alternatif (CA) comme le courant continu (CC) sur de tels appareils est assez compliqu\u00e9, car cela n\u00e9cessite des circuits sophistiqu\u00e9s. Mais surtout, le courant alternatif subit une perte d\u2019\u00e9nergie, m\u00eame si celle-ci ne dure qu\u2019un temps infinit\u00e9simal, ce que les serveurs, en constante soif d\u2019\u00e9nergie, ne peuvent pas se permettre.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"681\" src=\"http:\/\/www.wigglewires.com\/wp-content\/uploads\/2024\/11\/server-room.webp\" alt=\"\" class=\"wp-image-2385\" srcset=\"https:\/\/www.wigglewires.com\/wp-content\/uploads\/2024\/11\/server-room.webp 1024w, https:\/\/www.wigglewires.com\/wp-content\/uploads\/2024\/11\/server-room-300x200.webp 300w, https:\/\/www.wigglewires.com\/wp-content\/uploads\/2024\/11\/server-room-768x511.webp 768w, https:\/\/www.wigglewires.com\/wp-content\/uploads\/2024\/11\/server-room-18x12.webp 18w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Les salles de serveurs sont g\u00e9n\u00e9ralement climatis\u00e9es et destin\u00e9es au fonctionnement continu des serveurs informatiques. (Source de l'image : Flickr)<\/p>\n\n\n\n<p>De plus, tout ing\u00e9nieur en \u00e9lectricit\u00e9 sait que les pertes accumul\u00e9es lors du transport de courant alternatif peuvent d\u00e9passer celles du courant continu en raison de l\u2019effet de peau et du couplage capacitif, ph\u00e9nom\u00e8nes par lesquels, l\u2019\u00e9nergie circulant \u00e0 la surface du fil, elle est absorb\u00e9e par les objets situ\u00e9s en dessous. Le transport est ralenti par ces r\u00e9sistances, ce qui r\u00e9duit d\u2019autant son rendement. En effet, les pertes dispers\u00e9es dans son voisinage constituent le principe sur lequel reposent les m\u00e9canismes de transfert d\u2019\u00e9nergie sans fil. Le courant alternatif rayonne une partie de son \u00e9nergie, qui peut \u00eatre facilement concentr\u00e9e dans une zone donn\u00e9e en enroulant le fil de mani\u00e8re appropri\u00e9e.<\/p>\n\n\n\n<p>Une autre raison \u2013 et celle-ci semble \u00eatre la plus importante \u2013 pour laquelle le courant continu pourrait faire son retour est sa compatibilit\u00e9 avec les appareils \u00e9lectroniques respectueux de l\u2019environnement. Comme toutes les cellules solaires reposent sur des substrats semi-conducteurs, elles g\u00e9n\u00e8rent toutes du courant continu ou fonctionnent avec ce type d\u2019alimentation. Le courant continu pourrait bien devoir faire son retour dans l\u2019int\u00e9r\u00eat des \u00e9nergies renouvelables. Bien s\u00fbr, on pourrait \u00e9galement recourir au courant alternatif (CA), mais cela n\u00e9cessiterait des conversions fastidieuses du courant continu en courant alternatif \u00e0 l\u2019aide d\u2019un onduleur, puis de nouveau en courant continu, ce qui entra\u00eenerait une perte d\u2019\u00e9nergie sous forme de chaleur de l\u2019ordre de 5-20%. En r\u00e9alit\u00e9, les centres de donn\u00e9es s\u2019\u00e9tendant sur plusieurs acres utilisent bel et bien ces convertisseurs, mais non seulement ceux-ci consomment d\u2019\u00e9normes quantit\u00e9s d\u2019\u00e9nergie, mais ils entra\u00eenent \u00e9galement un surco\u00fbt li\u00e9 aux syst\u00e8mes de refroidissement n\u00e9cessaires pour \u00e9vacuer la chaleur produite, ce qui aggrave encore leur situation financi\u00e8re.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Alors, qu'est-ce qui est mieux, le courant alternatif ou le courant continu ?<\/h2>\n\n\n\n<p>Bien que nous disposions d\u00e9sormais de la technologie permettant de transporter du courant continu sur de longues distances via les r\u00e9seaux \u00e9lectriques, nous continuons \u00e0 utiliser le courant alternatif. Le courant alternatif est port\u00e9 \u00e0 des tensions plus \u00e9lev\u00e9es pour surmonter la r\u00e9sistance, et lorsque l'\u00e9lectricit\u00e9 parvient \u00e0 l'utilisateur, elle est abaiss\u00e9e en tension puis redress\u00e9e pour alimenter, par exemple, un ordinateur. Cependant, ces technologies, \u00e0 l'instar des technologies renouvelables, co\u00fbtent non seulement une fortune, mais leur efficacit\u00e9 peut \u00e9galement \u00eatre remise en question. Certes, le courant continu offre des sorties stables, mais il permet d'atteindre un rendement sup\u00e9rieur&nbsp;<em>apr\u00e8s<\/em>&nbsp;\u00e9liminer les pertes.<\/p>\n\n\n\n<p>M\u00eame si les pertes sont peut-\u00eatre inf\u00e9rieures \u00e0 celles subies avec le courant alternatif, le facteur de transformation (\u00e9l\u00e9vation ou abaissement de tension) entre en jeu. La simplicit\u00e9 avec laquelle les tensions alternatives peuvent \u00eatre modul\u00e9es et achemin\u00e9es reste in\u00e9gal\u00e9e, ce qui explique pourquoi le courant alternatif pourrait encore \u00eatre privil\u00e9gi\u00e9. Ces deux sources d\u2019\u00e9nergie sont excellentes \u00e0 leur mani\u00e8re ; d\u00e9terminer laquelle l\u2019emporte d\u00e9pendra donc des crit\u00e8res pris en compte \u2013 le contexte. Le choix repose essentiellement sur l\u2019application de l\u2019\u00e9nergie.<\/p>\n\n\n\n<p>De nos jours, les deux fonctionnent de concert. Le courant alternatif circule au-dessus de nos t\u00eates dans des c\u00e2bles, \u00e0 l\u2019image des lignes d\u2019un agenda vierge qui aboutissent chez vous. La tension alternative est ensuite convertie en courant continu \u00e0 l\u2019aide d\u2019un&nbsp;<em>redresseur,<\/em>&nbsp;comme l'adaptateur fourni avec votre chargeur, pour alimenter des appareils m\u00e9nagers, tels que des ampoules, des lampes et d'autres appareils. La \u00ab guerre des courants \u00bb n'est peut-\u00eatre plus aussi spectaculaire qu'autrefois, mais elle persiste subtilement.<\/p>\n\n\n\n<p>Lire le&nbsp;<a href=\"https:\/\/www.scienceabc.com\/innovation\/ac-vs-dc-alternating-current-or-direct-current-which-is-better.html\"><em>article original<\/em><\/a>&nbsp;sur&nbsp;<a href=\"https:\/\/www.scienceabc.com\/\">L'ABC des sciences<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Le courant (charge \u00e9lectrique) ne circule que dans un sens dans le cas du CC (courant continu). Mais dans le cas du CA (courant alternatif), la charge \u00e9lectrique change p\u00e9riodiquement de sens. Non seulement le courant, mais aussi la tension s'inversent en raison de la variation du flux de courant. Le d\u00e9bat entre courant alternatif et courant continu personnifie la guerre des courants, comme on l'appelle aujourd'hui, dans laquelle les [...]<\/p>","protected":false},"author":1,"featured_media":2369,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[129],"tags":[],"class_list":["post-2382","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-knowledge"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>AC vs DC: Alternating Current or Direct Current \u2013 Which is Better? - Fenglong Greenhouse<\/title>\n<meta name=\"description\" content=\"- Fenglong Greenhouse\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wigglewires.com\/fr\/ac-vs-dc-alternating-current-or-direct-current-which-is-better-article\/\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AC vs DC: Alternating Current or Direct Current \u2013 Which is Better? 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