{"id":10246,"date":"2021-11-15T09:00:53","date_gmt":"2021-11-15T08:00:53","guid":{"rendered":"https:\/\/eoc.cat\/ley-ohm\/"},"modified":"2022-02-17T10:36:10","modified_gmt":"2022-02-17T09:36:10","slug":"llei-ohm","status":"publish","type":"post","link":"https:\/\/eoc.cat\/ca\/llei-ohm\/","title":{"rendered":"La Llei d&#8217;Ohm. La relaci\u00f3 entre tensi\u00f3, corrent i resist\u00e8ncia"},"content":{"rendered":"<p>La <strong>llei d&#8217;Ohm<\/strong> \u00e9s essencial per a entendre millor com funciona l&#8217;electricitat. A continuaci\u00f3, et comentem les seves caracter\u00edstiques i t&#8217;expliquem en qu\u00e8 consisteix.<\/p>\n<h2>Qui va crear la Llei d&#8217;Ohm?<\/h2>\n<p>Va ser George Simon Ohm en 1827. El seu descobriment confirmava la <strong>relaci\u00f3 entre tensi\u00f3 corrent i resist\u00e8ncia<\/strong>. Gr\u00e0cies a la seva formulaci\u00f3, s&#8217;han pogut realitzar tot tipus de c\u00e0lculs m\u00e9s f\u00e0cilment.<\/p>\n<h2>La seva f\u00f3rmula<\/h2>\n<p>Es centra en la intensitat del corrent (I) que recorre un conductor el\u00e8ctric. La mateixa \u00e9s directament proporcional a V (difer\u00e8ncia de potencial) i inversament proporcional a R (resist\u00e8ncia). \u00c9s a dir, la intensitat:<\/p>\n<ul>\n<li><strong>Augmenta<\/strong> quan es puja el voltatge, per\u00f2 no la resist\u00e8ncia.<\/li>\n<li><strong>Disminueix<\/strong> quan augmenta la resist\u00e8ncia, per\u00f2 no el voltatge.<\/li>\n<\/ul>\n<p>Per a expressar aquest concepte s&#8217;usen les seg\u00fcents f\u00f3rmules:<\/p>\n<ul>\n<li><strong>La intensitat<\/strong> \u00e9s igual a la divisi\u00f3 del voltatge per la resist\u00e8ncia. I= V\/R.<\/li>\n<li><strong>Els amperes<\/strong> s&#8217;aconsegueixen en dividir els volts pels ohms (resist\u00e8ncia). A=V\/\u03a9<\/li>\n<li><strong>El voltatge<\/strong> s&#8217;aconsegueix multiplicant el corrent per la resist\u00e8ncia. V= E x R.<\/li>\n<li><strong>Els volts<\/strong> en multiplicar amperes per ohms. V= A x \u03a9<\/li>\n<li><strong>La resist\u00e8ncia<\/strong> \u00e9s el resultat de la divisi\u00f3 entre el voltatge i la intensitat. R = V\/I.<\/li>\n<\/ul>\n<p>La seva conclusi\u00f3 confirmava que es necessita un volt perqu\u00e8 cada ampere de corrent pugui rec\u00f3rrer un ohm de resist\u00e8ncia.<\/p>\n<h2>De qu\u00e8 est\u00e0 compost un circuit?<\/h2>\n<p>Com qualsevol altra mat\u00e8ria, d\u2019<a href=\"https:\/\/ca.wikipedia.org\/wiki\/%C3%80tom\">\u00e0toms<\/a>. Es componen al seu torn de part\u00edcules diverses com:<\/p>\n<ul>\n<li><strong>Els protons:<\/strong> La seva c\u00e0rrega d&#8217;electricitat \u00e9s positiva.<\/li>\n<li><strong>Els neutrons:<\/strong> Amb c\u00e0rrega neutra.<\/li>\n<li><strong>Els electrons:<\/strong> La seva c\u00e0rrega \u00e9s negativa.<\/li>\n<\/ul>\n<p>Els \u00e0toms s&#8217;uneixen gr\u00e0cies a l&#8217;atracci\u00f3 que hi ha entre el nucli i els electrons d&#8217;un \u00e0tom en la seva part m\u00e9s exterior. En rebre la tensi\u00f3, els seus components es reformen augmentant la seva capacitat d&#8217;atracci\u00f3 o difer\u00e8ncia de potencial.<\/p>\n<p>Els electrons que queden lliures s&#8217;atreuen en direcci\u00f3 als protons per a crear un corrent o flux d&#8217;electrons. Tot el que freni el flux rep el nom de resist\u00e8ncia.<\/p>\n<h2>Quin \u00e9s el paper en els circuits el\u00e8ctrics de cadascun dels seus components?<\/h2>\n<p>Els amperes (A) mesuren el cabal d&#8217;electrons. Els volts marquen la quantitat de pressi\u00f3 que provoca el flux d&#8217;electrons. Els ohms s\u00f3n inhibidors del flux abans esmentat (es representen amb la lletra omega, \u03a9).<\/p>\n<h2>Quins s\u00f3n els avantatges de l&#8217;aplicaci\u00f3 de la Llei d&#8217;Ohm?<\/h2>\n<p><strong>Qualsevol t\u00e8cnic pot calcular el tercer valor<\/strong> de l&#8217;equaci\u00f3 coneixent nom\u00e9s dues. Coneixent la tensi\u00f3 i el corrent, pot esbrinar la resist\u00e8ncia. Aquesta \u00faltima no es pot calcular si el circuit est\u00e0 funcionant, d&#8217;aqu\u00ed la import\u00e0ncia de la llei. D&#8217;una altra forma, caldria desconnectar el circuit, mesurar la resist\u00e8ncia i tornar a posar-lo en funcionament.<\/p>\n<p>Si el t\u00e8cnic <strong>conegu\u00e9s la tensi\u00f3<\/strong> i la <strong>resist\u00e8ncia<\/strong>, per a descobrir el corrent nom\u00e9s ha de fer els c\u00e0lculs a dalt descrits. En el cas de voler esbrinar la tensi\u00f3, ha de multiplicar les meitats dels altres dos factors.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-9493 size-full\" title=\"mult\u00edmetre\" src=\"https:\/\/eoc.cat\/wp-content\/uploads\/2021\/10\/multimetro.jpg\" alt=\"mult\u00edmetre\" width=\"810\" height=\"513\" srcset=\"https:\/\/eoc.cat\/wp-content\/uploads\/2021\/10\/multimetro.jpg 810w, https:\/\/eoc.cat\/wp-content\/uploads\/2021\/10\/multimetro-480x304.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 810px, 100vw\" \/><\/p>\n<h2>Alguns exemples pr\u00e0ctics<\/h2>\n<p>A continuaci\u00f3, et proposem tres exemples perqu\u00e8 entenguis, f\u00e0cilment, com s&#8217;aplica la f\u00f3rmula.<\/p>\n<h3>Primer cas<\/h3>\n<p>Tens un circuit amb les seg\u00fcents dades:<\/p>\n<ul>\n<li><strong>E<\/strong>= 18 watts.<\/li>\n<li><strong>R<\/strong>= 6 \u03a9<\/li>\n<\/ul>\n<p>Quina \u00e9s la I? Dividim la tensi\u00f3 per la resist\u00e8ncia i obtenim un resultat de 3 A. S&#8217;aplica la f\u00f3rmula I= E\/R.<\/p>\n<h3>Segon cas<\/h3>\n<p>En un segon exemple tens un circuit amb E= 28 V i I= 4A. Es divideixen tots dos elements per a obtenir una resist\u00e8ncia de 7 \u03a9 . <strong>La f\u00f3rmula seria, R= E\/I.<\/strong><\/p>\n<h3>Tercer cas<\/h3>\n<p>Finalitzem els exemples amb un tercer cas. En <strong>aquest circuit: R= 9 \u03a9 i I = 6 A<\/strong>, el valor de la E seria el resultat de multiplicar tots dos elements, en aquest cas 54 V. La f\u00f3rmula aplicada \u00e9s: E= R x I.<\/p>\n<h2>Per a qu\u00e8 serveixen les f\u00f3rmules anteriors a la Llei d&#8217;Ohm?<\/h2>\n<p>B\u00e0sicament, per a comprovar els valors est\u00e0tics de les peces del circuit. T&#8217;ajuden a con\u00e8ixer quin \u00e9s el nivell de corrent especificant caigudes de tensi\u00f3 o alteracions en els subministraments. De tenir un circuit en el qual el corrent \u00e9s massa alta, pot deure&#8217;s a:<\/p>\n<ul>\n<li><strong>La disminuci\u00f3 de la resist\u00e8ncia.<\/strong><\/li>\n<li><strong>L\u2019augment de la tensi\u00f3<\/strong> derivat d&#8217;una alteraci\u00f3 del subministrament o del circuit.<\/li>\n<li>Si el <strong>circuit \u00e9s CC<\/strong> (de corrent continu) i baixa la tensi\u00f3, pot haver-se de l&#8217;augment de la resist\u00e8ncia o a una tensi\u00f3 insuficient. Caldria revisar les connexions o els possibles danys.<\/li>\n<\/ul>\n<p>En l&#8217;anterior influeixen les c\u00e0rregues de qualsevol aparell el\u00e8ctric. Generalment, \u00e9s habitual que incloguin un adhesiu que expliqui la seva tensi\u00f3 i el corrent amb la qual funcionen. En usar-se un mult\u00edmetre per a realitzar el mesurament, no sempre es detecta l&#8217;error. Sens dubte, la llei que venim explicant-te, ajuda a situar el problema i a solucionar-lo m\u00e9s f\u00e0cilment.<\/p>\n<p>Esperem haver-te explicat clarament la <strong>llei d&#8217;Ohm<\/strong>, segur que ara entens millor les seves virtuts. El seu \u00fas recurrent pels <a href=\"https:\/\/eoc.cat\/ca\/curs-delectricitat-general\/\">professionals del sector<\/a> confirma la seva indubtable validesa.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La llei d&#8217;Ohm \u00e9s essencial per a entendre millor com funciona l&#8217;electricitat. A continuaci\u00f3, et comentem les seves caracter\u00edstiques i t&#8217;expliquem en qu\u00e8 consisteix. Qui va crear la Llei d&#8217;Ohm? Va ser George Simon Ohm en 1827. El seu descobriment confirmava la relaci\u00f3 entre tensi\u00f3 corrent i resist\u00e8ncia. Gr\u00e0cies a la seva formulaci\u00f3, s&#8217;han pogut [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":9492,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[81],"tags":[82],"class_list":["post-10246","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electricitat-general","tag-electricitat-general"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>La Llei d&#039;Ohm. 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