{"id":14200,"date":"2023-09-25T02:21:10","date_gmt":"2023-09-25T02:21:10","guid":{"rendered":"https:\/\/www.rayzeek.com\/?p=14200"},"modified":"2023-12-26T08:45:20","modified_gmt":"2023-12-26T08:45:20","slug":"what-is-cathode","status":"publish","type":"post","link":"https:\/\/www.rayzeek.com\/pt\/glossario\/o-que-e-o-catodo","title":{"rendered":"O que \u00e9 o c\u00e1todo"},"content":{"rendered":"<h2 class=\"wp-block-heading\" id=\"h-what-is-cathode\">O que \u00e9 o c\u00e1todo<\/h2><p>Um c\u00e1todo \u00e9 um el\u00e9trodo com carga negativa numa l\u00e2mpada de descarga em g\u00e1s ou num dispositivo el\u00e9trico. O c\u00e1todo \u00e9 respons\u00e1vel pela emiss\u00e3o de electr\u00f5es e por facilitar o fluxo de corrente el\u00e9ctrica no interior do dispositivo.<\/p><div class=\"insert_inquiry_outer_wrapper\"><h3>Procura solu\u00e7\u00f5es de poupan\u00e7a de energia activadas por movimento?<\/h3><p>Contacte-nos para obter sensores de movimento PIR completos, produtos de poupan\u00e7a de energia activados por movimento, interruptores com sensor de movimento e solu\u00e7\u00f5es comerciais de Ocupa\u00e7\u00e3o\/Vazio.<\/p><div class = \"insert_inquiry_buttons\"><div class = \"insert_inquiry_button_wrapper insert_inquiry_button_email\"><div><a href = \"mailto:info@rayzeek.com\"><p>Enviar um e-mail<\/p><\/a><\/div><\/div><div class = \"insert_inquiry_button_wrapper insert_inquiry_button_email_contact\"><div><a href=\"https:\/\/www.rayzeek.com\/pt\/contacto\"><p>Formul\u00e1rio de contacto<\/p><\/a><\/div><\/div><div class = \"insert_inquiry_button_wrapper insert_inquiry_button_chat chat_jump\"><div><a href=\"#\"><p>Conversar online<\/p><\/a><\/div><\/div><\/div><\/div><p>Nas l\u00e2mpadas de descarga de g\u00e1s, como as l\u00e2mpadas de n\u00e9on, o c\u00e1todo \u00e9 essencial para produzir luz como indicadores ou para fins de ilumina\u00e7\u00e3o especializada. Tamb\u00e9m \u00e9 utilizado em tubos de comuta\u00e7\u00e3o de c\u00e1todo frio, onde inicia e mant\u00e9m uma descarga incandescente necess\u00e1ria para fun\u00e7\u00f5es espec\u00edficas como comuta\u00e7\u00e3o e contagem. Al\u00e9m disso, os tubos reguladores de tens\u00e3o dependem da tens\u00e3o relativamente constante gerada pela descarga incandescente do c\u00e1todo para estabilizar as tens\u00f5es da fonte de alimenta\u00e7\u00e3o em instrumentos baseados em tubos.<\/p><p>O c\u00e1todo \u00e9 tamb\u00e9m um componente essencial noutros dispositivos, incluindo os Dekatrons utilizados para contagem, os tubos de flash para impulsos de luz intensos e curtos e os tubos de raios cat\u00f3dicos utilizados em v\u00e1rias aplica\u00e7\u00f5es de visualiza\u00e7\u00e3o. \u00c9 importante notar que o c\u00e1todo n\u00e3o necessita de aquecimento externo para a emiss\u00e3o de electr\u00f5es, o que o distingue de um c\u00e1todo quente.<\/p><div class=\"insert_portfolio_outer_wrapper\"><h3>Inspire-se nos portf\u00f3lios de sensores de movimento Rayzeek.<\/h3><p>N\u00e3o encontra o que pretende? N\u00e3o se preocupe. H\u00e1 sempre formas alternativas de resolver os seus problemas. Talvez um dos nossos portef\u00f3lios possa ajudar.<\/p><div class = \"insert_portfolio_buttons\"><div class = \"insert_portfolio_button_wrapper\"><div><a href = \"https:\/\/www.rayzeek.com\/pt\/categoria-de-produto\/sensores-de-movimento\"><p>Sensores de movimento PIR<\/p><\/a><\/div><\/div><div class = \"insert_portfolio_button_wrapper\"><div><a href=\"https:\/\/www.rayzeek.com\/pt\/interruptores-com-sensor-de-movimento\"><p>Interruptores com sensor de movimento<\/p><\/a><\/div><\/div><div class = \"insert_portfolio_button_wrapper\"><div><a href=\"https:\/\/www.rayzeek.com\/pt\/sensores-de-ocupacao-vaga\"><p>Sensores de ocupa\u00e7\u00e3o<\/p><\/a><\/div><\/div><div class = \"insert_portfolio_button_wrapper\"><div><a href=\"https:\/\/www.rayzeek.com\/pt\/produtos\/rz050\"><p>Sensor de movimento do ar condicionado<\/p><\/a><\/div><\/div><div class = \"insert_portfolio_button_wrapper\"><div><a href=\"https:\/\/www.rayzeek.com\/pt\/categoria-de-produto\/motion-sensor-light-strip\"><p>Fitas de luz com sensor de movimento<\/p><\/a><\/div><\/div><div class = \"insert_portfolio_button_wrapper\"><div><a href=\"https:\/\/www.rayzeek.com\/pt\/categoria-de-produto\/dc-sensor-dimmer\"><p>Sensores de movimento DC de baixa tens\u00e3o\/Dimmers<\/p><\/a><\/div><\/div><div class = \"insert_portfolio_button_wrapper\"><div><a href=\"https:\/\/www.rayzeek.com\/pt\/categoria-de-produto\/sensores-de-movimento-sem-fios\"><p>Kits de sensores de movimento sem fios<\/p><\/a><\/div><\/div><\/div><\/div><div class=\"wp-block-group glossary_faqs\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><h2 class=\"wp-block-heading\" id=\"h-frequently-asked-questions\">Perguntas Frequentes<\/h2>\n\n<div class=\"wp-block-group glossary_faq\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><div class=\"wp-block-group glossary_faq_q\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><h3 class=\"wp-block-heading\" id=\"h-how-do-you-tell-if-it-s-a-cathode-or-anode\">Como \u00e9 que se sabe se \u00e9 um c\u00e1todo ou um \u00e2nodo<\/h3><\/div><\/div>\n\n<div class=\"wp-block-group glossary_faq_a\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><p>O c\u00e1todo e o \u00e2nodo podem ser distinguidos com base no seu potencial. O el\u00e9trodo com um potencial mais elevado \u00e9 o el\u00e9trodo positivo. Quando a bateria est\u00e1 a ser descarregada, o el\u00e9trodo positivo funciona como c\u00e1todo, enquanto o el\u00e9trodo negativo funciona como \u00e2nodo. Inversamente, durante o processo de carregamento, o el\u00e9trodo positivo funciona como \u00e2nodo e o el\u00e9trodo negativo funciona como c\u00e1todo.<\/p><\/div><\/div><\/div><\/div>\n\n<div class=\"wp-block-group glossary_faq\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><div class=\"wp-block-group glossary_faq_q\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><h3 class=\"wp-block-heading\" id=\"h-what-is-the-voltage-of-a-cold-cathode-lamp\">Qual \u00e9 a tens\u00e3o de uma l\u00e2mpada de c\u00e1todo frio<\/h3><\/div><\/div>\n\n<div class=\"wp-block-group glossary_faq_a\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><p>A maioria dos circuitos de l\u00e2mpadas fluorescentes de c\u00e1todo frio (CCFL) necessita normalmente de uma tens\u00e3o de entrada que varia entre 5V e 30V. Estes circuitos foram concebidos para funcionar melhor com correntes de l\u00e2mpada de 5mA ou superiores. Consequentemente, n\u00e3o s\u00e3o adequados para um funcionamento de baixa pot\u00eancia utilizando baterias de 2 ou 3 c\u00e9lulas, normalmente encontradas em computadores palmtop e dispositivos port\u00e1teis.<\/p><\/div><\/div><\/div><\/div>\n\n<div class=\"wp-block-group glossary_faq\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><div class=\"wp-block-group glossary_faq_q\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><h3 class=\"wp-block-heading\" id=\"h-is-a-cathode-positive-or-negative\">Um c\u00e1todo \u00e9 positivo ou negativo?<\/h3><\/div><\/div>\n\n<div class=\"wp-block-group glossary_faq_a\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><p>Os c\u00e1todos t\u00eam o nome de cati\u00f5es, que s\u00e3o i\u00f5es com carga positiva, enquanto os \u00e2nodos t\u00eam o nome de ani\u00f5es, que s\u00e3o i\u00f5es com carga negativa. Num dispositivo el\u00e9trico, o c\u00e1todo \u00e9 o el\u00e9trodo que transporta uma carga negativa.<\/p><\/div><\/div><\/div><\/div>\n\n<div class=\"wp-block-group glossary_faq\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><div class=\"wp-block-group glossary_faq_q\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><h3 class=\"wp-block-heading\" id=\"h-are-fluorescent-lights-cold-cathode\">As l\u00e2mpadas fluorescentes s\u00e3o de c\u00e1todo frio?<\/h3><\/div><\/div>\n\n<div class=\"wp-block-group glossary_faq_a\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><p>As l\u00e2mpadas de c\u00e1todo frio, como as l\u00e2mpadas fluorescentes de c\u00e1todo frio (CCFL) e as l\u00e2mpadas de n\u00e9on, pertencem \u00e0 categoria das l\u00e2mpadas de c\u00e1todo frio. As l\u00e2mpadas de n\u00e9on emitem luz atrav\u00e9s da excita\u00e7\u00e3o de mol\u00e9culas de g\u00e1s, enquanto as CCFL geram luz ultravioleta atrav\u00e9s de uma descarga de vapor de merc\u00fario, que depois desencadeia a emiss\u00e3o de luz vis\u00edvel a partir de um revestimento fluorescente no interior da l\u00e2mpada.<\/p><\/div><\/div><\/div><\/div>\n\n<div class=\"wp-block-group glossary_faq\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><div class=\"wp-block-group glossary_faq_q\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><h3 class=\"wp-block-heading\" id=\"h-what-is-an-example-of-a-hot-cathode-lamp\">O que \u00e9 um exemplo de uma l\u00e2mpada de c\u00e1todo quente?<\/h3><\/div><\/div>\n\n<div class=\"wp-block-group glossary_faq_a\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><p>As l\u00e2mpadas de c\u00e1todo frio, como as l\u00e2mpadas de n\u00e9on, os tubos de sinaliza\u00e7\u00e3o de n\u00e9on e as l\u00e2mpadas de vapor de s\u00f3dio, s\u00e3o exemplos de l\u00e2mpadas com c\u00e1todo quente. Al\u00e9m disso, as l\u00e2mpadas de c\u00e1todo quente incluem l\u00e2mpadas de vapor de merc\u00fario de m\u00e9dia press\u00e3o e l\u00e2mpadas de vapor de merc\u00fario de baixa press\u00e3o, como as l\u00e2mpadas fluorescentes.<\/p><\/div><\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Um c\u00e1todo \u00e9 um eletrodo carregado negativamente em uma l\u00e2mpada de descarga de g\u00e1s ou dispositivo el\u00e9trico. O c\u00e1todo \u00e9 respons\u00e1vel por emitir el\u00e9trons e facilitar o fluxo de corrente el\u00e9trica dentro do dispositivo. Procurando por Ativa\u00e7\u00e3o por Movimento<\/p>","protected":false},"author":4,"featured_media":12864,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"article_term":"","article_term_alternate":"","article_term_def":"","article_hook":"","auto_links":"[{\"keyword\": \"gas-discharge lamp\", \"idxall\": 0, \"keywordtitlesimi\": 0.8284668922424316, \"keywordslugsimi\": 0.8284668922424316, \"paratitlesimi\": 0.7006882429122925, \"paraslugsimi\": 0.7006882429122925, \"slug\": \"what-is-discharge-lamp\", \"title\": \"What is Discharge Lamp\", \"id\": 12938}, {\"keyword\": \"neon lamps\", \"idxall\": 0, \"keywordtitlesimi\": 0.8084534406661987, \"keywordslugsimi\": 0.8084534406661987, \"paratitlesimi\": 0.6463078856468201, \"paraslugsimi\": 0.6463078856468201, \"slug\": \"what-is-neon-light\", \"title\": \"What is Neon Light\", \"id\": 14046}, {\"keyword\": \"gas-discharge lamps\", \"idxall\": 0, \"keywordtitlesimi\": 0.8010953068733215, \"keywordslugsimi\": 0.8010953068733215, \"paratitlesimi\": 0.6775931119918823, \"paraslugsimi\": 0.6775931119918823, \"slug\": \"what-is-discharge-lamp\", \"title\": \"What is Discharge Lamp\", \"id\": 12938}]","article_topic":"","article_fact_check":"","mt_social_share":"","mt_content_meta":"","mt_glossary_display":"","glossary_heading":"","glossary":"Cathode","glossary_alter":"","glossary_def":"","article_task":"","footnotes":""},"categories":[102],"tags":[99],"class_list":["post-14200","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-glossary","tag-glossary"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is Cathode - Rayzeek<\/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:\/\/www.rayzeek.com\/pt\/glossario\/o-que-e-o-catodo\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is Cathode - Rayzeek\" \/>\n<meta property=\"og:description\" content=\"A cathode is a negatively charged electrode in a gas-discharge lamp or electrical device. The cathode is responsible for emitting electrons and facilitating the flow of electrical current within the device.Looking For Motion-Activat\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.rayzeek.com\/pt\/glossario\/o-que-e-o-catodo\" \/>\n<meta property=\"og:site_name\" content=\"Rayzeek\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/bester001\/\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/bester001\/\" \/>\n<meta property=\"article:published_time\" content=\"2023-09-25T02:21:10+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-12-26T08:45:20+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.rayzeek.com\/wp-content\/uploads\/2023\/06\/rayzeek-glossary-image-6.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"800\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Horace He\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@RayzeekTech\" \/>\n<meta name=\"twitter:site\" content=\"@RayzeekTech\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Horace He\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.rayzeek.com\/glossary\/what-is-cathode#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.rayzeek.com\/glossary\/what-is-cathode\"},\"author\":{\"name\":\"Horace He\",\"@id\":\"https:\/\/www.rayzeek.com\/#\/schema\/person\/ff0b4bd6573444e02efc8613274549c4\"},\"headline\":\"What is Cathode\",\"datePublished\":\"2023-09-25T02:21:10+00:00\",\"dateModified\":\"2023-12-26T08:45:20+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.rayzeek.com\/glossary\/what-is-cathode\"},\"wordCount\":444,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.rayzeek.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.rayzeek.com\/glossary\/what-is-cathode#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.rayzeek.com\/wp-content\/uploads\/2023\/06\/rayzeek-glossary-image-6.jpg\",\"keywords\":[\"glossary\"],\"articleSection\":[\"glossary\"],\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.rayzeek.com\/glossary\/what-is-cathode#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.rayzeek.com\/glossary\/what-is-cathode\",\"url\":\"https:\/\/www.rayzeek.com\/glossary\/what-is-cathode\",\"name\":\"What is Cathode - Rayzeek\",\"isPartOf\":{\"@id\":\"https:\/\/www.rayzeek.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.rayzeek.com\/glossary\/what-is-cathode#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.rayzeek.com\/glossary\/what-is-cathode#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.rayzeek.com\/wp-content\/uploads\/2023\/06\/rayzeek-glossary-image-6.jpg\",\"datePublished\":\"2023-09-25T02:21:10+00:00\",\"dateModified\":\"2023-12-26T08:45:20+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/www.rayzeek.com\/glossary\/what-is-cathode#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.rayzeek.com\/glossary\/what-is-cathode\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"pt-PT\",\"@id\":\"https:\/\/www.rayzeek.com\/glossary\/what-is-cathode#primaryimage\",\"url\":\"https:\/\/www.rayzeek.com\/wp-content\/uploads\/2023\/06\/rayzeek-glossary-image-6.jpg\",\"contentUrl\":\"https:\/\/www.rayzeek.com\/wp-content\/uploads\/2023\/06\/rayzeek-glossary-image-6.jpg\",\"width\":1200,\"height\":800},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.rayzeek.com\/glossary\/what-is-cathode#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.rayzeek.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"What is Cathode\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.rayzeek.com\/#website\",\"url\":\"https:\/\/www.rayzeek.com\/\",\"name\":\"Rayzeek\",\"description\":\"Motion Sensor &amp; 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