{"id":14039,"date":"2023-05-04T14:00:00","date_gmt":"2023-05-04T12:00:00","guid":{"rendered":"https:\/\/rdcomponents.com\/site\/?p=14039"},"modified":"2025-08-27T09:51:40","modified_gmt":"2025-08-27T07:51:40","slug":"80-la-resistenza-sui-contatti","status":"publish","type":"post","link":"https:\/\/rdcomponents.com\/site\/2023\/05\/04\/80-la-resistenza-sui-contatti\/","title":{"rendered":"#80 – La resistenza sui contatti"},"content":{"rendered":"\n
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Sappiamo che la resistenza \u00e8 la misura con cui un corpo si oppone al passaggio della corrente elettrica in un circuito elettrico alimentato. Il suo valore \u00e8 misurato in Ohm 1<\/sup>, dal fisico tedesco Georg Simon Ohm<\/strong> (1789-1854) che studi\u00f2 la relazione tra tensione, corrente e resistenza arrivando a formulare la cosiddetta Legge di Ohm. Il valore della resistenza varia a seconda dei materiali e di questo ne abbiamo fatto cenno in \u201cContatti in oro<\/strong><\/a>\u201d, cos\u00ec come in \u201cPolvere tra i contatti e conducibilit\u00e0 elettrica<\/strong><\/a>\u201d. Avevamo analizzato alcune circostanze che possono rendere pi\u00f9 difficoltoso il passaggio di corrente tra i contatti di un termostato o di un protettore termico.<\/p>\n\n\n\n

I materiali con una bassa resistenza al passaggio di corrente sono definiti \u201cConduttori\u201d (argento, oro, rame, alluminio). Quelli con un\u2019elevata resistenza si definiscono \u201cIsolanti\u201d (gomma, carta, vetro, legno, plastica).<\/p>\n<\/div>

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\"Resistenza<\/figure>
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I termostati TK24 sono costruiti con un bassissimo livello di resistenza sui contatti, con uno standard che \u00e8 inferiore ai 50 mOhm, una versione pi\u00f9 accurata che arriva al massimo ai 10 mOhm e una soluzione a bassissima resistenza che non supera i 5 mOhm, sia che i contatti siano inizialmente in una posizione normalmente aperta che normalmente chiusa (\u201cR&D Social \u2013 Articoli 16<\/strong><\/a> e 26<\/strong><\/a>\u201d) e questi valori sono gli stessi per tutta la gamma indipendentemente da quella che sar\u00e0 in seguito la temperatura alla quale il termostato interverr\u00e0.<\/p>\n\n\n\n

La lettura della resistenza tramite un tester in fase di collaudo, o prima dell\u2019utilizzo del termostato, \u00e8 una buona soluzione per scoprire eventuali anomalie poich\u00e9 maggiore \u00e8 la resistenza e minore sar\u00e0 il flusso di corrente che passer\u00e0 attraverso i contatti del termostato.<\/p>\n\n\n\n

THERMOREX<\/strong> fa un controllo sulla resistenza di tutti i termostati al termine del processo di produzione e prima che lascino la fabbrica, pertanto \u00e8 da escludersi che un termostato possa avere una resistenza maggiore di quella dichiarata, a meno che non siano intervenute delle anomalie.<\/p>\n<\/div><\/div>\n\n\n\n

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Le cause pi\u00f9 frequenti che portano a rilevare una resistenza pi\u00f9 alta di quella prevista sono:<\/p>\n\n\n\n

1. <\/strong>Banalmente una misurazione sbagliata. Innanzitutto, bisogna eseguire questo test a freddo, senza passaggio di corrente. Inoltre non \u00e8 impossibile appoggiare i puntalini in modo errato, oppure toccarli, in fase di misurazione, con le dita. Questo potrebbe portare un\u2019interferenza nella lettura.<\/p>\n\n\n\n

2.<\/strong> Il termostato potrebbe avere subito un impatto meccanico ed essersi danneggiato<\/p>\n\n\n\n

3. <\/strong>Infine la formazione di uno strato di ossidazione, o pi\u00f9 semplicemente di polvere sui contatti dovuto all’influenza dell’ambiente durante il trasporto o lo stoccaggio. Bench\u00e8 ci\u00f2 non influisce sui parametri di temperatura del termostato, non \u00e8 in ogni caso un fenomeno desiderabile.<\/p>\n\n\n\n

Ecco come un semplice utilizzo del tester potrebbe rilevare anomalie indesiderate in un termostato.<\/p>\n\n\n\n

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1) Vale a dire \u201cV = R x I\u201d dove \u201cV\u201d \u00e8 la Tensione e viene misurata in \u201cVolt\u201d, \u201cR\u201d \u00e8 la Resistenza e viene misurata in Ohm, e \u201cI\u201d \u00e8 la Corrente, misurata in \u201cAmpere\u201d quindi esprimibile anche con la formula: \u201cVolt = Ohm x Ampere\u201d .<\/p>\n\n\n\n

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Scarica l’articolo in versione stampabile cliccando qui sotto!<\/p>\n\n\n\n

80-LA-RESISTENZA-SUI-CONTATTI<\/a>Download<\/a><\/div>\n\n\n\n
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Sappiamo che la resistenza \u00e8 la misura con cui un corpo si oppone al passaggio della corrente elettrica in un circuito elettrico alimentato. Il suo valore \u00e8 misurato in Ohm 1, dal fisico tedesco Georg Simon Ohm (1789-1854) che studi\u00f2 la relazione tra tensione, corrente e resistenza arrivando a formulare la cosiddetta Legge di Ohm. Il…<\/p>\n","protected":false},"author":2,"featured_media":14040,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[239],"tags":[123,303,166],"class_list":["post-14039","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-funzionamento-tecnico","tag-contatti","tag-ohm","tag-resistenza"],"yoast_head":"\n#80 - La resistenza sui contatti -<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rdcomponents.com\/site\/2023\/05\/04\/80-la-resistenza-sui-contatti\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"#80 - La resistenza sui contatti -\" \/>\n<meta property=\"og:description\" content=\"Sappiamo che la resistenza \u00e8 la misura con cui un corpo si oppone al passaggio della corrente elettrica in un circuito elettrico alimentato. 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Ferranti","author_link":"https:\/\/rdcomponents.com\/site\/author\/roberto\/"},"rttpg_comment":0,"rttpg_category":"<a href=\"https:\/\/rdcomponents.com\/site\/category\/funzionamento-tecnico\/\" rel=\"category tag\">Funzionamento tecnico<\/a>","rttpg_excerpt":"Sappiamo che la resistenza \u00e8 la misura con cui un corpo si oppone al passaggio della corrente elettrica in un circuito elettrico alimentato. Il suo valore \u00e8 misurato in Ohm 1, dal fisico tedesco Georg Simon Ohm (1789-1854) che studi\u00f2 la relazione tra tensione, corrente e resistenza arrivando a formulare la cosiddetta Legge di Ohm. Il...","_links":{"self":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/posts\/14039","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/comments?post=14039"}],"version-history":[{"count":0,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/posts\/14039\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/media\/14040"}],"wp:attachment":[{"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/media?parent=14039"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/categories?post=14039"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rdcomponents.com\/site\/wp-json\/wp\/v2\/tags?post=14039"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}