{"id":10752,"date":"2019-01-31T08:56:19","date_gmt":"2019-01-31T07:56:19","guid":{"rendered":"https:\/\/eoc.cat\/corriente-alterna-corriente-continua\/"},"modified":"2022-02-17T10:52:22","modified_gmt":"2022-02-17T09:52:22","slug":"corriente-alterna-corriente-continua","status":"publish","type":"post","link":"https:\/\/eoc.cat\/ca\/corriente-alterna-corriente-continua\/","title":{"rendered":"Corrent altern i corrent continu. Tot el que necessites saber"},"content":{"rendered":"<p>A l&#8217;hora de parlar d&#8217;electricitat, \u00e9s important distingir els conceptes de corrent altern i corrent continu. Aquests conceptes es fan servir constantment per parlar del funcionament de dispositius i equips. \u00c9s a dir, d&#8217;aparells d&#8217;\u00fas diari o quotidi\u00e0, tant a les llars com a diferents \u00e0mbits de treball.<\/p>\n<p>Abans de res, \u00e9s vital definir qu\u00e8 \u00e9s l&#8217;electricitat en si mateixa. Com ja sabreu, l&#8217;electricitat constitueix un tipus d&#8217;energia. Aquesta es genera pel moviment dels electrons a trav\u00e9s de l\u2019estructura d\u2019un material conductor. Aquest material ha de permetre el flux dels electrons al seu interior, i si no \u00e9s aix\u00ed, actuar\u00e0 com a a\u00efllant del material esmentat.<\/p>\n<h2>Fonaments dels tipus de corrent<\/h2>\n<p>La capacitat de conductivitat dels materials es representa mitjan\u00e7ant una mesura establerta al Sistema Internacional. Aquesta unitat, el Siemens, es representa amb la lletra S, i s&#8217;hi estableix el nivell de conduct\u00e0ncia el\u00e8ctrica.<\/p>\n<p>Quan tenim identificat un material conductor i el seu valor de conduct\u00e0ncia, hem de valorar el tipus de corrent. I \u00e9s que els electrons es poden moure en un sol sentit o alternar-ne el moviment en dos. Per tant, en funci\u00f3 de cada tipus de moviment, distingim dues classes de corrent:<\/p>\n<ul>\n<li>El corrent continu. \u00c9s aquella el flux d&#8217;electrons de la qual es produeix en un mateix sentit constantment. Per la seva denominaci\u00f3 en angl\u00e8s,\u00a0Direct Current,\u00a0es designa internacionalment per les sigles DC. En espanyol, \u00e9s possible que vegis que tamb\u00e9 s&#8217;identifica amb les sigles CC.<\/li>\n<li>Corrent altern. El flux d&#8217;electrons s&#8217;hi produeix en dos sentits. Se sol denominar amb les sigles AC pel seu nom en angl\u00e8s,\u00a0Alterning Current. En espanyol, en canvi, es pot designar amb les sigles CA.<\/li>\n<\/ul>\n<p>La major part de les xarxes el\u00e8ctriques empren el corrent altern. Les bateries, dinamos i piles, per la seva banda, produeixen corrent de tipus continu.<\/p>\n<p>A continuaci\u00f3, aprofundirem en els detalls de cada tipus d&#8217;electricitat. D&#8217;aquesta manera, us resultar\u00e0 m\u00e9s f\u00e0cil comprendre per qu\u00e8 s&#8217;utilitzen per a diferents fins.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-5913\" src=\"https:\/\/eoc.cat\/wp-content\/uploads\/2019\/01\/corriente-continua-alterna.jpg\" alt=\"corriente continua alterna\" width=\"810\" height=\"513\" srcset=\"https:\/\/eoc.cat\/wp-content\/uploads\/2019\/01\/corriente-continua-alterna.jpg 810w, https:\/\/eoc.cat\/wp-content\/uploads\/2019\/01\/corriente-continua-alterna-300x190.jpg 300w, https:\/\/eoc.cat\/wp-content\/uploads\/2019\/01\/corriente-continua-alterna-768x486.jpg 768w\" sizes=\"(max-width: 810px) 100vw, 810px\" \/><\/p>\n<h2>El corrent altern<\/h2>\n<p>El corrent altern \u00e9s el que produeixen els alternadors, i el que es genera a les centrals el\u00e8ctriques. En conseq\u00fc\u00e8ncia, aquest tipus de corrent \u00e9s el que utilitzes cada dia en connectar aparells als endolls i preses de corrent a casa teva o a la feina. Es tracta del corrent est\u00e0ndard, at\u00e8s que \u00e9s molt m\u00e9s f\u00e0cil de produir i transportar.<\/p>\n<p>Al moment de produir-la, un alternador gira les espires del rotor 50 vegades per segon. Amb aix\u00f2, es generen la tensi\u00f3 i el corrent denominades sinuso\u00efdals o sinuso\u00efdals. Per al gir descrit de l&#8217;alternador es diu que la freq\u00fc\u00e8ncia del corrent altern \u00e9s de 50 Hz. A Am\u00e8rica, la freq\u00fc\u00e8ncia \u00e9s de 60 Hz.<\/p>\n<p>La intensitat varia constantment amb el temps, \u00e9s a dir, que el nombre d\u2019electrons no deixa de variar. Alhora, canvia de sentit de circulaci\u00f3 les 50 vegades que ho fa l&#8217;alternador que la produeix. La tensi\u00f3 que es desencadena entre els borns o els pols tamb\u00e9 varia en forma <a href=\"https:\/\/www.infootec.net\/la-corriente-alterna-la-onda-senoidal\/\">d&#8217;ona sinuso\u00efdal<\/a>. Com veus, la tensi\u00f3 tampoc no \u00e9s constant.<\/p>\n<p>Pel que fa a la tensi\u00f3 a les llars, es diu que tenim una tensi\u00f3 de 230 volts. Aix\u00f2 ho diem perqu\u00e8, encara que la tensi\u00f3 canvia de forma constant, es fa servir un valor de refer\u00e8ncia. Aquest par\u00e0metre \u00e9s el valor efica\u00e7 i \u00e9s el que un corrent continu ha d&#8217;assolir per produir el mateix efecte en un receptor d&#8217;altern.<\/p>\n<p>Perqu\u00e8 ho entenguis millor posarem un exemple amb un radiador el\u00e8ctric: si el connect\u00e9ssim a 220 V de corrent continu produiria la mateixa calor que connectant-lo a alterna amb un m\u00e0xim de 325 V de tensi\u00f3 variable. D&#8217;aquesta manera podr\u00edem afirmar que aquesta tensi\u00f3 alterna proporciona una tensi\u00f3 de 220 V, encara que aquest sigui un valor variable.<\/p>\n<h2>El corrent continu<\/h2>\n<p>El corrent de tipus continu \u00e9s el que se sol produir en bateries, piles i dinamos. Als extrems o pols d\u2019aquests generadors d\u2019electricitat es crea una tensi\u00f3 constant. En altres paraules, es produeix un nivell de voltatge que no varia amb el temps. Aix\u00f2 vol dir que, per exemple, una pila de 9 volts proporcionar\u00e0 sempre aquest mateix voltatge a qualsevol receptor. L&#8217;\u00fanica manera que deixi de passar \u00e9s que aquesta pila es gasti i tingui, en conseq\u00fc\u00e8ncia, una tensi\u00f3 menor.<\/p>\n<p>A m\u00e9s, tot receptor connectat a un generador de corrent continu rep un corrent constant. Per aix\u00f2, el mateix nombre d\u2019electrons es mou amb el pas del temps i en la mateixa direcci\u00f3. Aquesta \u00e9s la ra\u00f3 principal per la qual pots veure que els pols positiu i negatiu s\u00f3n sempre els mateixos.<\/p>\n<p>Ara que ja coneixes els detalls del corrent altern i el corrent continu ets un pas m\u00e9s a prop de dominar tots els aspectes de l&#8217;electricitat. I si est\u00e0s pensant a formar-te al sector el\u00e8ctric no dubtis a consultar-nos sobre les nostres formacions <a href=\"https:\/\/eoc.cat\/ca\/curs-delectricitat-general\/\">d&#8217;electricitat general<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A l&#8217;hora de parlar d&#8217;electricitat, \u00e9s important distingir els conceptes de corrent altern i corrent continu. Aquests conceptes es fan servir constantment per parlar del funcionament de dispositius i equips. \u00c9s a dir, d&#8217;aparells d&#8217;\u00fas diari o quotidi\u00e0, tant a les llars com a diferents \u00e0mbits de treball. Abans de res, \u00e9s vital definir qu\u00e8 [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":5912,"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-10752","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 v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Corrent altern i corrent continu | EOC Barcelona<\/title>\n<meta name=\"description\" content=\"Coneixes les difer\u00e8ncies entre el corrent altern i el corrent continu? 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