{"id":5931,"date":"2025-05-23T09:29:13","date_gmt":"2025-05-23T07:29:13","guid":{"rendered":"https:\/\/www.zsvltava.cz\/fyzika\/?p=5931"},"modified":"2025-05-26T18:07:52","modified_gmt":"2025-05-26T16:07:52","slug":"rozdil-mezi-rezistanci-a-rezistivitou","status":"publish","type":"post","link":"https:\/\/www.zsvltava.cz\/fyzika\/?p=5931","title":{"rendered":"Rozd\u00edl mezi REZISTANC\u00cd a REZISTIVITOU"},"content":{"rendered":"

Rezistance (odpor) je m\u011b\u0159iteln\u00fd elektrick\u00fd odpor konkr\u00e9tn\u00edho vodi\u010de nebo sou\u010d\u00e1stky.<\/strong><\/p>\n

Ozna\u010dujeme R, jednotka je Ω (Ohm) a z\u00e1vis\u00ed na:<\/p>\n

– materi\u00e1lu (tedy na rezistivit\u011b),
\n– d\u00e9lce vodi\u010de,
\n– pr\u016f\u0159ezu vodi\u010de.<\/p>\n

  <\/span>   <\/span>\"\[<\/p>\n

R = elektrick\u00e1 rezistance (odpor) [\u03a9]
\n\ud835\udf0c = rezistivita (m\u011brn\u00fd elektrick\u00fd odpor) [\u03a9\u00b7m]
\n\ud835\udc59 = d\u00e9lka vodi\u010de [m]
\n\ud835\udc46 = pr\u016f\u0159ez vodi\u010de [m\u00b2]<\/p>\n

Rezistivita je materi\u00e1lov\u00e1 vlastnost l\u00e1tky \u2013 \u0159\u00edk\u00e1, jak siln\u011b dan\u00fd materi\u00e1l klade odpor pr\u016fchodu elektrick\u00e9ho proudu.<\/strong><\/p>\n

Ozna\u010dujeme ρ (r\u00f3), jednotka: [Ω\u00b7m] (Ohm na metr) a z\u00e1vis\u00ed pouze na materi\u00e1lu. <\/p>\n

Nap\u0159. m\u011b\u010f m\u00e1 ρ = 1,68.10\u22128<\/sup>, sklo m\u00e1 ρ = 1010<\/sup><\/p>\n

\n

Mohli bychom to p\u0159irovnat k hustot\u011b l\u00e1tky a hmotnosti t\u011blesa. Hustota je obecn\u00e1 a vzta\u017een\u00e1 na jednotkov\u00fd metr krychlov\u00fd (= rezistivita). Hmotnost t\u011blesa (= rezistance) je dan\u00e1 sou\u010dinem hustoty l\u00e1tky a konkr\u00e9tn\u00edho objemu, tedy konkr\u00e9tn\u00ed „n\u00e1sobek hustoty“.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Rezistance (odpor) je m\u011b\u0159iteln\u00fd elektrick\u00fd odpor konkr\u00e9tn\u00edho vodi\u010de nebo sou\u010d\u00e1stky. Ozna\u010dujeme R, jednotka je Ω (Ohm) a z\u00e1vis\u00ed na: – materi\u00e1lu (tedy na rezistivit\u011b), – …. <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-5931","post","type-post","status-publish","format-standard","hentry","category-elektrina-a-magnetismus"],"_links":{"self":[{"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/posts\/5931","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5931"}],"version-history":[{"count":14,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/posts\/5931\/revisions"}],"predecessor-version":[{"id":5954,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/posts\/5931\/revisions\/5954"}],"wp:attachment":[{"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5931"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5931"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5931"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}