{"id":30665,"date":"2021-06-10T10:09:04","date_gmt":"2021-06-10T08:09:04","guid":{"rendered":"https:\/\/blog.tecnimodel.com\/calculer-la-valeur-d-une-resistance-pour-l-installation-d-une-led\/"},"modified":"2026-08-14T11:15:14","modified_gmt":"2026-08-14T09:15:14","slug":"calculer-la-valeur-d-une-resistance-pour-l-installation-d-une-led","status":"publish","type":"post","link":"https:\/\/tecnimodel.com\/blog\/calculer-la-valeur-d-une-resistance-pour-l-installation-d-une-led\/","title":{"rendered":"Calculer la valeur d&rsquo;une r\u00e9sistance pour l&rsquo;installation d&rsquo;une led"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">La luminosit\u00e9 d&rsquo;une led d\u00e9pend de sa tension d&rsquo;alimentation et de la valeur de la r\u00e9sistance qui lui est jointe. Voici une explication sur la m\u00e9thode de calcul de cette valeur de r\u00e9sistance.<\/p>\n\n\n\n<!--more-->\n\n\n\n<p class=\"wp-block-paragraph\">Pour calculer la valeur d&rsquo;une r\u00e9sistance, il faut appliquer la loi d&rsquo;Ohm, \u00e0 savoir :&nbsp;<strong><i>R<\/i> = <i>U<\/i> \/ <i>I<\/i><\/strong>, elle permet de calculer la valeur d&rsquo;une r\u00e9sistance lorsque l&rsquo;on connait la tension d&rsquo;alimentation et l\u2019intensit\u00e9 d\u00e9sir\u00e9e.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans la loi d&rsquo;Ohm, la tension est exprim\u00e9e en <a title=\"Volt\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Volt\">volts<\/a> (<abbr class=\"abbr\" title=\"volt\">V<\/abbr>), la r\u00e9sistance en <a title=\"\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Ohm_(unit%C3%A9)\">ohms<\/a> (<abbr class=\"abbr\" title=\"ohm\">\u03a9<\/abbr>) et l\u2019intensit\u00e9 en <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Amp%C3%A8re\" target=\"_blank\" rel=\"noreferrer noopener\">amp\u00e8res<\/a> (<abbr class=\"abbr\" title=\"amp\u00e8re\">A<\/abbr>).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour simplifier cette op\u00e9ration de calcul, on trouve sur internet des calculateurs pr\u00e9vus \u00e0 cet effet, comme <a href=\"https:\/\/www.digikey.fr\/fr\/resources\/conversion-calculators\/conversion-calculator-led-series-resistor\" target=\"_blank\" rel=\"noopener\">celui-ci<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">D\u00e9terminer le bon courant pour la bonne luminosit\u00e9<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour une luminosit\u00e9 faible telle qu&rsquo;une veilleuse ou un feu de position, le courant \u00e0 renseigner est d&rsquo;environ 5mA.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour une luminosit\u00e9 plus importante telle que des feux de croisement ou des clignotants, renseigner un courant de 8 \u00e0 10mA.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour une luminosit\u00e9 forte telle qu&rsquo;un projecteur ou un feu longue port\u00e9e, renseigner un courant de 15 \u00e0 20mA (la diff\u00e9rence de luminosit\u00e9 n&rsquo;est pas significative).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>Attention : ne pas d\u00e9passer 20mA dans une led classique, ceci engendrerait une d\u00e9t\u00e9rioration, voire sa destruction !<\/strong><\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Calcul de la valeur de la r\u00e9sistance<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Retournons sur le calculateur propos\u00e9 un peu plus haut : <a href=\"https:\/\/www.digikey.fr\/fr\/resources\/conversion-calculators\/conversion-calculator-led-series-resistor\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.digikey.fr\/fr\/resources\/conversion-calculators\/conversion-calculator-led-series-resistor<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour d\u00e9terminer la valeur de la r\u00e9sistance, il faut renseigner 3 param\u00e8tres :&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span class=\"input-headline\">Tension d&rsquo;alimentation<\/span><\/li>\n\n\n\n<li><span class=\"input-headline\">Tension directe<\/span><\/li>\n\n\n\n<li><span class=\"input-headline\">Courant direct<\/span><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Entrer la tension de fonctionnement de votre mod\u00e8le : 6v, 7.2v, 8.4v, 12v &#8230;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Entrer la tension directe envoy\u00e9e \u00e0 la LED (le voltage appliqu\u00e9 \u00e0 une led d\u00e9pend de sa couleur) : se r\u00e9f\u00e9rer au tableau suivant<\/p>\n\n\n\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;6ad5479d8ca73&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"6ad5479d8ca73\" class=\"wp-block-image is-style-custom-fixed-height wp-lightbox-container\"><img decoding=\"async\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on--click=\"actions.showLightbox\" data-wp-on--load=\"callbacks.setButtonStyles\" data-wp-on--pointerdown=\"actions.preloadImage\" data-wp-on--pointerenter=\"actions.preloadImageWithDelay\" data-wp-on--pointerleave=\"actions.cancelPreload\" data-wp-on-window--resize=\"callbacks.setButtonStyles\" src=\"https:\/\/blog.tecnimodel.com\/wp-content\\gallery\/trucs-et-astuces-calculer-la-valeur-dune-resistance-pour-linstallation-dune-led\/tension_admissible_led_1_20210610_1781148201.jpg\" alt=\"\"\/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\tdata-wp-bind--aria-label=\"state.thisImage.triggerButtonAriaLabel\"\n\t\t\tdata-wp-init=\"callbacks.initTriggerButton\"\n\t\t\tdata-wp-on--click=\"actions.showLightbox\"\n\t\t\tdata-wp-style--right=\"state.thisImage.buttonRight\"\n\t\t\tdata-wp-style--top=\"state.thisImage.buttonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewBox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Entrer le courant direct, en fonction de la luminosit\u00e9 souhait\u00e9e.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><span style=\"text-decoration: underline;\">Pour rappel :<\/span><\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Luminosit\u00e9 faible = 5mA<\/li>\n\n\n\n<li>Luminosit\u00e9 moyenne = 8 \u00e0 10mA<\/li>\n\n\n\n<li>Luminosit\u00e9 forte = 15 \u00e0 20mA<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vous pouvez retrouver nos r\u00e9sistances en cliquant <a href=\"https:\/\/www.tecnimodel.com\/recherche?controller=search&amp;orderby=position&amp;orderway=desc&amp;search_query=RETM0000&amp;submit_search=\" target=\"_blank\" rel=\"noopener\">ici<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La luminosit\u00e9 d&rsquo;une led d\u00e9pend de sa tension d&rsquo;alimentation et de la valeur de la r\u00e9sistance qui lui est jointe. Voici une explication sur la m\u00e9thode de calcul de cette valeur de r\u00e9sistance.<\/p>\n","protected":false},"author":14,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"0","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","footnotes":""},"categories":[260],"tags":[],"class_list":["post-30665","post","type-post","status-publish","format-standard","hentry","category-trucs-et-astuces"],"_links":{"self":[{"href":"https:\/\/tecnimodel.com\/blog\/wp-json\/wp\/v2\/posts\/30665","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tecnimodel.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tecnimodel.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tecnimodel.com\/blog\/wp-json\/wp\/v2\/users\/14"}],"replies":[{"embeddable":true,"href":"https:\/\/tecnimodel.com\/blog\/wp-json\/wp\/v2\/comments?post=30665"}],"version-history":[{"count":6,"href":"https:\/\/tecnimodel.com\/blog\/wp-json\/wp\/v2\/posts\/30665\/revisions"}],"predecessor-version":[{"id":40246,"href":"https:\/\/tecnimodel.com\/blog\/wp-json\/wp\/v2\/posts\/30665\/revisions\/40246"}],"wp:attachment":[{"href":"https:\/\/tecnimodel.com\/blog\/wp-json\/wp\/v2\/media?parent=30665"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tecnimodel.com\/blog\/wp-json\/wp\/v2\/categories?post=30665"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tecnimodel.com\/blog\/wp-json\/wp\/v2\/tags?post=30665"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}