{"id":2969,"date":"2026-01-27T21:06:40","date_gmt":"2026-01-27T19:06:40","guid":{"rendered":"https:\/\/dkouzas.sites.sch.gr\/?p=2969"},"modified":"2026-02-01T19:18:00","modified_gmt":"2026-02-01T17:18:00","slug":"2-8-2-9","status":"publish","type":"post","link":"https:\/\/dkouzas.sites.sch.gr\/?p=2969","title":{"rendered":"2.8 &amp; 2.9 &amp; 2.10"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center\">2.8 \u0397\u03bb\u03b5\u03ba\u03c4\u03c1\u03b5\u03b3\u03b5\u03c1\u03c4\u03b9\u03ba\u03ae \u03b4\u03cd\u03bd\u03b1\u03bc\u03b7(\u0397\u0395\u0394) \u03c0\u03b7\u03b3\u03ae\u03c2<br>2.9 \u039d\u03cc\u03bc\u03bf\u03c2 \u03c4\u03bf\u03c5 \u039fhm \u03b3\u03b9\u03b1 \u03ba\u03bb\u03b5\u03b9\u03c3\u03c4\u03cc \u03ba\u03cd\u03ba\u03bb\u03c9\u03bc\u03b1<br>2.10 \u0391\u03c0\u03bf\u03b4\u03ad\u03ba\u03c4\u03b5\u03c2<\/h2>\n\n\n\n<div class=\"wp-block-group alignfull dash-banner\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group alignfull is-content-justification-center is-nowrap is-layout-flex wp-container-core-group-is-layout-4f54976d wp-block-group-is-layout-flex\">\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-e148e5c0 wp-block-group-is-layout-flex\">\n<p class=\"banner-icon wp-block-paragraph\">\ud83d\udcd6<\/p>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<h3 class=\"wp-block-heading\">\u03a8\u03b7\u03c6\u03b9\u03b1\u03ba\u03cc \u0392\u03b9\u03b2\u03bb\u03af\u03bf<\/h3>\n\n\n\n<p class=\"banner-subtitle wp-block-paragraph\">\u039a\u03ac\u03bd\u03c4\u03b5 \u03ba\u03bb\u03b9\u03ba \u03b5\u03b4\u03ce \u03b3\u03b9\u03b1 \u03ac\u03bd\u03bf\u03b9\u03b3\u03bc\u03b1 \u03c4\u03bf\u03c5 \u03ba\u03b5\u03c6\u03b1\u03bb\u03b1\u03af\u03bf\u03c5<\/p>\n<\/div><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-right is-layout-flex wp-container-core-buttons-is-layout-89b4c9e9 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/ebooks.edu.gr\/ebooks\/v\/html\/8547\/2682\/Fysiki_B-Lykeiou-Genikis-Paideias_html-empl\/index2_8.html\" target=\"_blank\" rel=\"noreferrer noopener\">\u0391\u039d\u039f\u0399\u0393\u039c\u0391<\/a><\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group alignfull notes-section has-normal-font-size\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading\">\ud83d\udccc \u03a3\u03cd\u03bd\u03bf\u03c8\u03b7<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u039f\u03b9 \u03b5\u03bd\u03cc\u03c4\u03b7\u03c4\u03b5\u03c2 2.8 \u03ba\u03b1\u03b9 2.9 \u03c4\u03bf\u03c5 \u03c3\u03c7\u03bf\u03bb\u03b9\u03ba\u03bf\u03cd \u03b2\u03b9\u03b2\u03bb\u03af\u03bf\u03c5 \u03b1\u03bd\u03b1\u03bb\u03cd\u03bf\u03c5\u03bd \u03c4\u03b7 \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03af\u03b1 \u03c4\u03c9\u03bd \u03b7\u03bb\u03b5\u03ba\u03c4\u03c1\u03b9\u03ba\u03ce\u03bd \u03c0\u03b7\u03b3\u03ce\u03bd \u03c3\u03b5 \u03ba\u03bb\u03b5\u03b9\u03c3\u03c4\u03ac \u03ba\u03c5\u03ba\u03bb\u03ce\u03bc\u03b1\u03c4\u03b1. \u0397 \u0397\u03bb\u03b5\u03ba\u03c4\u03c1\u03b5\u03b3\u03b5\u03c1\u03c4\u03b9\u03ba\u03ae \u0394\u03cd\u03bd\u03b1\u03bc\u03b7 (\u0397\u0395\u0394) \u03bf\u03c1\u03af\u03b6\u03b5\u03c4\u03b1\u03b9 \u03c9\u03c2 \u03b7 \u03b5\u03bd\u03ad\u03c1\u03b3\u03b5\u03b9\u03b1 \u03c0\u03bf\u03c5 \u03c0\u03b1\u03c1\u03ad\u03c7\u03b5\u03b9 \u03b7 \u03c0\u03b7\u03b3\u03ae \u03b1\u03bd\u03ac \u03bc\u03bf\u03bd\u03ac\u03b4\u03b1 \u03c6\u03bf\u03c1\u03c4\u03af\u03bf\u03c5, \u03b5\u03bd\u03ce \u03b7 \u03b5\u03c3\u03c9\u03c4\u03b5\u03c1\u03b9\u03ba\u03ae \u03b1\u03bd\u03c4\u03af\u03c3\u03c4\u03b1\u03c3\u03b7 rr \u03c0\u03c1\u03bf\u03ba\u03b1\u03bb\u03b5\u03af \u03b1\u03c0\u03ce\u03bb\u03b5\u03b9\u03b5\u03c2 \u03b5\u03bd\u03ad\u03c1\u03b3\u03b5\u03b9\u03b1\u03c2 \u03c9\u03c2 \u03b8\u03b5\u03c1\u03bc\u03cc\u03c4\u03b7\u03c4\u03b1. \u039f \u039d\u03cc\u03bc\u03bf\u03c2 \u03c4\u03bf\u03c5 Ohm \u03b3\u03b9\u03b1 \u03ba\u03bb\u03b5\u03b9\u03c3\u03c4\u03cc \u03ba\u03cd\u03ba\u03bb\u03c9\u03bc\u03b1 \u03b4\u03b9\u03b1\u03c4\u03c5\u03c0\u03ce\u03bd\u03b5\u03c4\u03b1\u03b9 \u03c9\u03c2 I=\u03b5R+rI=R+r\u03b5, \u03c3\u03c5\u03bd\u03b4\u03ad\u03bf\u03bd\u03c4\u03b1\u03c2 \u03c4\u03b7\u03bd \u03ad\u03bd\u03c4\u03b1\u03c3\u03b7 \u03c1\u03b5\u03cd\u03bc\u03b1\u03c4\u03bf\u03c2 \u03bc\u03b5 \u03c4\u03b7\u03bd \u03bf\u03bb\u03b9\u03ba\u03ae \u03b1\u03bd\u03c4\u03af\u03c3\u03c4\u03b1\u03c3\u03b7. \u0397 \u03c0\u03bf\u03bb\u03b9\u03ba\u03ae \u03c4\u03ac\u03c3\u03b7 V\u03c0=\u03b5\u2212I\u22c5rV\u03c0=\u03b5\u2212I\u22c5r \u03b5\u03be\u03b1\u03c1\u03c4\u03ac\u03c4\u03b1\u03b9 \u03b1\u03c0\u03cc \u03c4\u03bf \u03c1\u03b5\u03cd\u03bc\u03b1 \u03ba\u03b1\u03b9 \u03bc\u03b5\u03b9\u03ce\u03bd\u03b5\u03c4\u03b1\u03b9 \u03bb\u03cc\u03b3\u03c9 \u03c4\u03b7\u03c2 \u03b5\u03c3\u03c9\u03c4\u03b5\u03c1\u03b9\u03ba\u03ae\u03c2 \u03b1\u03bd\u03c4\u03af\u03c3\u03c4\u03b1\u03c3\u03b7\u03c2. \u0395\u03b9\u03b4\u03b9\u03ba\u03ad\u03c2 \u03c0\u03b5\u03c1\u03b9\u03c0\u03c4\u03ce\u03c3\u03b5\u03b9\u03c2 \u03cc\u03c0\u03c9\u03c2 \u03c4\u03bf \u03b2\u03c1\u03b1\u03c7\u03c5\u03ba\u03cd\u03ba\u03bb\u03c9\u03bc\u03b1 (I\u03b2\u03c1=\u03b5rI\u03b2\u03c1=r\u03b5) \u03ba\u03b1\u03b9 \u03b7 \u03b1\u03bd\u03bf\u03b9\u03c7\u03c4\u03ae \u03c0\u03b7\u03b3\u03ae (V\u03c0=\u03b5V\u03c0=\u03b5) \u03b1\u03bd\u03b1\u03bb\u03cd\u03bf\u03bd\u03c4\u03b1\u03b9 \u03bc\u03b5 \u03c0\u03b1\u03c1\u03b1\u03b4\u03b5\u03af\u03b3\u03bc\u03b1\u03c4\u03b1.<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group alignfull multimedia-zone\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading\">\ud83c\udfac \u03a0\u03bf\u03bb\u03c5\u03bc\u03ad\u03c3\u03b1<\/h2>\n\n\n\n<div class=\"wp-block-group alignfull canva-box\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-columns alignfull is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-group alignfull wp-container-content-ffc8cefc\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-text-align-center\" style=\"padding: 20px 20px; color: #888;\"><i class=\"fas fa-chalkboard-teacher\" style=\"font-size: 2em; margin-bottom: 15px;\"><\/i><br><strong>\u03a0\u03b1\u03c1\u03bf\u03c5\u03c3\u03af\u03b1\u03c3\u03b7<\/strong><br><\/p>\n\n\n<div class=\"_df_book df-lite\" id=\"df_2971\"  _slug=\"2971\" data-title=\"phl2_2_8_9\" wpoptions=\"true\" thumbtype=\"\" ><\/div><script class=\"df-shortcode-script\" nowprocket type=\"application\/javascript\">window.option_df_2971 = {\"outline\":[],\"backgroundColor\":\"transperant\",\"autoEnableOutline\":\"false\",\"autoEnableThumbnail\":\"false\",\"overwritePDFOutline\":\"false\",\"direction\":\"1\",\"pageSize\":\"0\",\"source\":\"https:\\\/\\\/dkouzas.sites.sch.gr\\\/wp-content\\\/uploads\\\/2026\\\/01\\\/PHL2_2_8_9_SL.pdf\",\"wpOptions\":\"true\"}; if(window.DFLIP && window.DFLIP.parseBooks){window.DFLIP.parseBooks();}<\/script>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns alignfull is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:60%\">\n<div class=\"wp-block-group alignfull wp-container-content-da09a7bf is-vertical is-content-justification-stretch\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-text-align-center\" style=\"padding: 20px 20px; color: #888;\"><i class=\"fas fa-video\" style=\"font-size: 2em; margin-bottom: 15px;\"><\/i><br><strong>\u0392\u03af\u03bd\u03c4\u03b5\u03bf \u039c\u03b1\u03b8\u03ae\u03bc\u03b1\u03c4\u03bf\u03c2<\/strong> <br><\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-4-3 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"\u0397\u0395\u0394 \u03ba\u03b1\u03b9 \u0395\u03c3\u03c9\u03c4\u03b5\u03c1\u03b9\u03ba\u03ae \u03b1\u03bd\u03c4\u03af\u03c3\u03c4\u03b1\u03c3\u03b7 \u03c0\u03b7\u03b3\u03ae\u03c2\" width=\"580\" height=\"435\" src=\"https:\/\/www.youtube.com\/embed\/5ON9v4xyXUg?start=1&#038;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n<\/div><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:40%\">\n<div class=\"wp-block-group alignfull\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-text-align-center\" style=\"padding: 20px 20px; color: #888;\"><i class=\"fas fa-info-circle\" style=\"font-size: 2em; margin-bottom: 15px;\"><\/i><br><strong>Infographic<\/strong><\/p>\n\n\n\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;6a415dd29b426&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"6a415dd29b426\" class=\"wp-block-image size-large wp-container-content-69bc4bdf wp-lightbox-container\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"572\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on--click=\"actions.showLightbox\" data-wp-on--load=\"callbacks.setButtonStyles\" data-wp-on--pointerdown=\"actions.preloadImage\" data-wp-on--pointerenter=\"actions.preloadImageWithDelay\" data-wp-on--pointerleave=\"actions.cancelPreload\" data-wp-on-window--resize=\"callbacks.setButtonStyles\" src=\"https:\/\/dkouzas.sites.sch.gr\/wp-content\/uploads\/2026\/01\/PHL2_2_8_9_IG-1024x572.png\" alt=\"\" class=\"wp-image-2975\" srcset=\"https:\/\/dkouzas.sites.sch.gr\/wp-content\/uploads\/2026\/01\/PHL2_2_8_9_IG-1024x572.png 1024w, https:\/\/dkouzas.sites.sch.gr\/wp-content\/uploads\/2026\/01\/PHL2_2_8_9_IG-300x167.png 300w, https:\/\/dkouzas.sites.sch.gr\/wp-content\/uploads\/2026\/01\/PHL2_2_8_9_IG-768x429.png 768w, https:\/\/dkouzas.sites.sch.gr\/wp-content\/uploads\/2026\/01\/PHL2_2_8_9_IG-1536x857.png 1536w, https:\/\/dkouzas.sites.sch.gr\/wp-content\/uploads\/2026\/01\/PHL2_2_8_9_IG-2048x1143.png 2048w, https:\/\/dkouzas.sites.sch.gr\/wp-content\/uploads\/2026\/01\/PHL2_2_8_9_IG-1200x670.png 1200w, https:\/\/dkouzas.sites.sch.gr\/wp-content\/uploads\/2026\/01\/PHL2_2_8_9_IG-1980x1105.png 1980w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\tdata-wp-bind--aria-label=\"state.thisImage.triggerButtonAriaLabel\"\n\t\t\tdata-wp-init=\"callbacks.initTriggerButton\"\n\t\t\tdata-wp-on--click=\"actions.showLightbox\"\n\t\t\tdata-wp-style--right=\"state.thisImage.buttonRight\"\n\t\t\tdata-wp-style--top=\"state.thisImage.buttonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewBox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><\/figure>\n\n\n\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;6a415dd29c80f&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"6a415dd29c80f\" class=\"wp-block-image size-large is-style-default wp-lightbox-container\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"572\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on--click=\"actions.showLightbox\" data-wp-on--load=\"callbacks.setButtonStyles\" data-wp-on--pointerdown=\"actions.preloadImage\" data-wp-on--pointerenter=\"actions.preloadImageWithDelay\" data-wp-on--pointerleave=\"actions.cancelPreload\" data-wp-on-window--resize=\"callbacks.setButtonStyles\" src=\"https:\/\/dkouzas.sites.sch.gr\/wp-content\/uploads\/2026\/01\/PHL2_2_10_IG-1024x572.png\" alt=\"\" class=\"wp-image-3436\" 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