<\/p>\n
P\u0159.: \u017d\u00e1rovka je nap\u00e1jena bateri\u00ed 4,5 V a proch\u00e1z\u00ed j\u00ed proud 0,002 A (tj. 2mA) Jak\u00fd je v\u00fdkon elektrick\u00e9ho proudu v obvodu?<\/p>\n
P=U.I<\/strong> Vyu\u017e\u00edvan\u00fd v\u00fdkon, kter\u00fd je schopno za\u0159\u00edzen\u00ed dodat b\u00fdv\u00e1 v\u017edy men\u0161\u00ed ne\u017e v\u00fdkon elektrick\u00e9ho proudu. Pozn.: v\u00fdkon se d\u00e1 m\u011b\u0159it Wattmetrem. Ten m\u00e1 4 elektrody.<\/li>\n Elektrick\u00fd v\u00fdkon (p\u0159\u00edkon) Zna\u010dka P, jednotka 1 Watt (W) Pojmy v\u00fdkon a p\u0159\u00edkon znamenaj\u00ed z fyzik\u00e1ln\u00edho hlediska vlastn\u011b to sam\u00e9. Existuj\u00ed 3 druhy v\u00fdkonu: v\u00fdkon elektrick\u00e9ho proudu (tj. p\u0159\u00edkon) v obvodu P=U.I vyu\u017e\u00edvan\u00fd v\u00fdkon, kter\u00fd je schopno za\u0159\u00edzen\u00ed dodat ztr\u00e1tov\u00fd v\u00fdkon (ztr\u00e1ty) P\u0159.: \u017d\u00e1rovka je nap\u00e1jena bateri\u00ed 4,5 V a proch\u00e1z\u00ed j\u00ed proud 0,002 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":13,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":""},"class_list":["post-79","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.krusinsky.cz\/domains\/krusinsky.cz\/wp-json\/wp\/v2\/pages\/79","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.krusinsky.cz\/domains\/krusinsky.cz\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.krusinsky.cz\/domains\/krusinsky.cz\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.krusinsky.cz\/domains\/krusinsky.cz\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.krusinsky.cz\/domains\/krusinsky.cz\/wp-json\/wp\/v2\/comments?post=79"}],"version-history":[{"count":3,"href":"https:\/\/www.krusinsky.cz\/domains\/krusinsky.cz\/wp-json\/wp\/v2\/pages\/79\/revisions"}],"predecessor-version":[{"id":171,"href":"https:\/\/www.krusinsky.cz\/domains\/krusinsky.cz\/wp-json\/wp\/v2\/pages\/79\/revisions\/171"}],"up":[{"embeddable":true,"href":"https:\/\/www.krusinsky.cz\/domains\/krusinsky.cz\/wp-json\/wp\/v2\/pages\/13"}],"wp:attachment":[{"href":"https:\/\/www.krusinsky.cz\/domains\/krusinsky.cz\/wp-json\/wp\/v2\/media?parent=79"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nP = 4,5 * 0,002
\nP = 0,009 W
\nV\u00fdkon elektrick\u00e9ho proudu v obvodu je 0,009W.<\/strong>
\nPozn 1.: Kdy\u017e pou\u017e\u00edv\u00e1te pro v\u00fdpo\u010det v obou 2 veli\u010din\u00e1ch z\u00e1kladn\u00ed jednotky (Volt, Amp\u00e9r), vyjde v\u00fdkon tak\u00e9 v z\u00e1kladn\u00ed jednotce, a to 1 Watt.<\/p>\n
\nNap\u0159. vyu\u017e\u00edvan\u00fd sv\u011bteln\u00fd v\u00fdkon ji\u017e zm\u00edn\u011bn\u00e9 \u017e\u00e1rovky b\u00fdv\u00e1 v\u017edy men\u0161\u00ed ne\u017e celkov\u00fd v\u00fdkon proudu, kter\u00fd j\u00ed proch\u00e1z\u00ed (tj. jej\u00ed p\u0159\u00edkon). Zbytek v\u00fdkonu je v\u00fdkon tepeln\u00fd. A ten se b\u011b\u017en\u011b nevyu\u017e\u00edv\u00e1. A to jsou pr\u00e1v\u011b ztr\u00e1ty.<\/strong> Sou\u010det tepeln\u00e9ho a sv\u011bteln\u00e9ho v\u00fdkonu d\u00e1v\u00e1 dohromady celkov\u00fd v\u00fdkon elektrick\u00e9ho proudu.
\nV jin\u00fdch za\u0159\u00edzen\u00edch nemus\u00ed b\u00fdt jen sv\u011bteln\u00fd a tepeln\u00fd v\u00fdkon, ale m\u016f\u017ee tam b\u00fdt i jin\u00fd. (Zvukov\u00fd, pohybov\u00fd, mechanick\u00fd…)<\/p>\n
\nKdy\u017e v ji\u017e zm\u00edn\u011bn\u00e9m obvodu v\u00fdkon elektrick\u00e9ho proudu (tj. p\u0159\u00edkon) ve Wattech vyn\u00e1sob\u00edte \u010dasem v sekund\u00e1ch, vyjde V\u00e1m elektrick\u00e1 pr\u00e1ce v obvodu.
\nElektrick\u00e1 pr\u00e1ce m\u00e1 zna\u010dku W (Nepl\u00e9st s Wattem u v\u00fdkonu!) a z\u00e1kladn\u00ed jednotku 1 Ws (Wattsekunda) (neboli 1 Watt kr\u00e1t 1 sekunda)
\nPozn.: U mechanick\u00e9 pr\u00e1ce ve fyzice nen\u00ed Ws, ale J (Joule) (Jednotka tepla, energie a mechanick\u00e9 pr\u00e1ce.) Tj. Kdy\u017e n\u011bjak\u00e9 elektrick\u00e9 za\u0159\u00edzen\u00ed top\u00ed teplem 1 J, tak na topen\u00ed spot\u0159ebuje 1 Ws.
\nVzorec pro v\u00fdpo\u010det mechanick\u00e9 pr\u00e1ce je W=P.t<\/strong>\u00a0\u00a0 (P se zde mysl\u00ed p\u0159\u00edkon.) \u00a0 neboli\u00a0\u00a0 W=U.I.t<\/strong><\/li>\n