{"id":3231,"date":"2023-05-02T06:45:22","date_gmt":"2023-05-02T06:45:22","guid":{"rendered":"https:\/\/thermibel.be\/faq\/in-a-thermocouple-what-are-the-seebeck-peltier-and-thomson-effects\/"},"modified":"2023-06-27T05:54:08","modified_gmt":"2023-06-27T05:54:08","slug":"in-a-thermocouple-what-are-the-seebeck-peltier-and-thomson-effects","status":"publish","type":"faq","link":"https:\/\/thermibel.be\/en\/faq\/in-a-thermocouple-what-are-the-seebeck-peltier-and-thomson-effects\/","title":{"rendered":"In a thermocouple what are the Seebeck, Peltier and Thomson effects?"},"content":{"rendered":"\n<p>The production of a voltage between dissimilar metals with their ends at different temperatures is a function of <strong>the three thermoelectric effects<\/strong> in metals:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>The Seebeck effect:<\/strong> Thomas Johann Seebeck (1770-1831) was the first person to demonstrate the thermoelectric effects of producing currents which occur in a circuit comprising two metals where the two welds are at different temperatures. He did not fail to note the phenomenon caused by a temperature difference along a homogeneous conductor; a phenomenon which would be rediscovered thirty years later by William Thomson and called the Thomson Effect. <\/li>\n\n\n\n<li><strong>The Peltier effect:<\/strong> Jean Charles Athanase Peltier, French physicist (1785-1845), gave up the profession of watchmaker at the age of thirty to devote himself to experimental physics; he is known for his discovery in 1834 of the Peltier effect: when an electric current passes through the junction of two dissimilar metal conductors, there is a rise or fall in temperature depending on the direction of the current; the amount of heat released or absorbed is proportional to the strength of the current. It is in a sense the converse of the Seebeck effect. Passing a current can therefore cause heat to be absorbed; this effect is used in some small refrigerators or to cool electric circuits.  <\/li>\n\n\n\n<li><strong>The Thomson effect:<\/strong> This was discovered by Lord Kelvin (then Sir William Thomson) &#8211; but already noted by Seebeck &#8211; who proved its existence by experiment after demonstrating it theoretically. It is a sort of Peltier effect but between contiguous sections of the same metal bar. The Thomson effect relates to the production &#8211; or absorption &#8211; of heat caused by passing a current through a section of a conductor where there is a difference in temperature between the ends of the section.  <\/li>\n<\/ul>\n","protected":false},"featured_media":0,"template":"","format":"standard","class_list":["post-3231","faq","type-faq","status-publish","format-standard","hentry"],"acf":[],"aioseo_notices":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>In a thermocouple what are the Seebeck, Peltier and Thomson effects? - Thermibel<\/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:\/\/thermibel.be\/en\/faq\/in-a-thermocouple-what-are-the-seebeck-peltier-and-thomson-effects\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"In a thermocouple what are the Seebeck, Peltier and Thomson effects? 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