{"id":2191,"date":"2022-01-14T04:50:51","date_gmt":"2022-01-14T04:50:51","guid":{"rendered":"http:\/\/learnlearn.uk\/alevelcs\/?page_id=2191"},"modified":"2022-01-27T08:02:29","modified_gmt":"2022-01-27T08:02:29","slug":"logic-gates-2","status":"publish","type":"page","link":"https:\/\/learnlearn.uk\/alevelcs\/logic-gates-2\/","title":{"rendered":"Logic Gates"},"content":{"rendered":"<div class=\"responsive-tabs\">\n<h2 class=\"tabtitle\">Video<\/h2>\n<div class=\"tabcontent\">\n\n<h3>Introductory Video<\/h3>\n<div class=\"nv-iframe-embed\">\n<div class=\"container-lazyload preview-lazyload container-youtube js-lazyload--not-loaded\"><a href=\"https:\/\/www.youtube.com\/watch?v=gI-qXk7XojA\" class=\"lazy-load-youtube preview-lazyload preview-youtube\" data-video-title=\"Boolean Logic &amp; Logic Gates: Crash Course Computer Science #3\" title=\"Play video &quot;Boolean Logic &amp; Logic Gates: Crash Course Computer Science #3&quot;\">https:\/\/www.youtube.com\/watch?v=gI-qXk7XojA<\/a><noscript>Video can&#8217;t be loaded because JavaScript is disabled: <a href=\"https:\/\/www.youtube.com\/watch?v=gI-qXk7XojA\" title=\"Boolean Logic &amp; Logic Gates: Crash Course Computer Science #3\">Boolean Logic &amp; Logic Gates: Crash Course Computer Science #3 (https:\/\/www.youtube.com\/watch?v=gI-qXk7XojA)<\/a><\/noscript><\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n\n<\/div><h2 class=\"tabtitle\">NOT<\/h2>\n<div class=\"tabcontent\">\n\n<h3>NOT Gates<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/not-gate-300x108.png\" \/><\/p>\n<p>A NOT Gate is the simplest form of logic gate. It merely takes the single input and reverses the signal.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-2192 \" src=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2022\/01\/NOT-Gif-mini.gif?_t=1642134826\" alt=\"\" width=\"745\" height=\"375\" \/><\/p>\n<table style=\"height: 210px; background-color: #dadee7;\" width=\"586\">\n<tbody>\n<tr>\n<td style=\"text-align: center;\" colspan=\"2\"><strong>NOT Gate Truth Table<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>Input A<\/strong><\/td>\n<td><strong>Output<\/strong><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n\n<\/div><h2 class=\"tabtitle\">AND<\/h2>\n<div class=\"tabcontent\">\n\n<h3>AND Gates<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/and-gate-300x108.png\" \/><\/p>\n<p>An AND Gate is gate that only produces an output if both inputs are turned on.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-2194\" src=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2022\/01\/AND-Gate-mini.gif\" alt=\"\" width=\"697\" height=\"351\" \/><\/p>\n<table style=\"height: 274px; background-color: #dadee7;\" width=\"697\">\n<tbody>\n<tr>\n<td style=\"text-align: center;\" colspan=\"3\"><b>AND Gate Truth Table<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>Input A<\/b><\/td>\n<td><b>Input B<\/b><\/td>\n<td><b>Output<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n\n<\/div><h2 class=\"tabtitle\">OR<\/h2>\n<div class=\"tabcontent\">\n\n<h3>OR Gates<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/or-gates-300x108.png\" \/><\/p>\n<p>An OR gate is a type of gate that will produce an output if either(or both) the inputs are on.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-2196\" src=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2022\/01\/OR-Gate-mini.gif\" alt=\"\" width=\"693\" height=\"349\" \/><\/p>\n<table style=\"height: 286px; background-color: #dadee7;\" width=\"692\">\n<tbody>\n<tr>\n<td style=\"text-align: center;\" colspan=\"3\"><b>OR Gate Truth Table<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>Input A<\/b><\/td>\n<td><b>Input B<\/b><\/td>\n<td><b>Output<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n\n<\/div><h2 class=\"tabtitle\">NAND<\/h2>\n<div class=\"tabcontent\">\n\n<h3>NAND Gates<\/h3>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-2212 size-medium\" src=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2022\/01\/NAND-gate-300x99.png?_t=1642137384\" alt=\"\" width=\"300\" height=\"99\" srcset=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2022\/01\/NAND-gate-300x99.png 300w, https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2022\/01\/NAND-gate-768x253.png 768w, https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2022\/01\/NAND-gate.png 827w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>A NAND gate is a gate that only turns off both if both inputs are on, otherwise it stay on. It is made up of an AND gate feeding into a NOT gate.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-2198\" src=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2022\/01\/NAND-mini.gif\" alt=\"\" width=\"701\" height=\"353\" \/><\/p>\n<table style=\"height: 205px; background-color: #dadee7;\" width=\"698\">\n<tbody>\n<tr>\n<td style=\"text-align: center;\" colspan=\"3\"><b>NAND Gate Truth Table<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>Input A<\/b><\/td>\n<td><b>Input B<\/b><\/td>\n<td><b>Output<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n<\/div><h2 class=\"tabtitle\">NOR<\/h2>\n<div class=\"tabcontent\">\n\n<h3>NOR Gates<\/h3>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-2210\" src=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2022\/01\/NOR-gate.png\" alt=\"\" width=\"382\" height=\"162\" srcset=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2022\/01\/NOR-gate.png 382w, https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2022\/01\/NOR-gate-300x127.png 300w\" sizes=\"(max-width: 382px) 100vw, 382px\" \/><\/p>\n<p>An NOR gate only turns on if both inputs are off. It is made up of an OR gate feeding into a NOT gate.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-2200\" src=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2022\/01\/NOR-Gate-mini.gif\" alt=\"\" width=\"693\" height=\"349\" \/><\/p>\n<table style=\"height: 325px; background-color: #dadee7;\" width=\"690\">\n<tbody>\n<tr>\n<td style=\"text-align: center;\" colspan=\"3\"><b>NOR Gate Truth Table<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>Input A<\/b><\/td>\n<td><b>Input B<\/b><\/td>\n<td><b>Output<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n<\/div><h2 class=\"tabtitle\">XOR<\/h2>\n<div class=\"tabcontent\">\n\n<h3>XOR Gates<\/h3>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-2211\" src=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2022\/01\/XOR-Gate.png\" alt=\"\" width=\"382\" height=\"142\" srcset=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2022\/01\/XOR-Gate.png 382w, https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2022\/01\/XOR-Gate-300x112.png 300w\" sizes=\"(max-width: 382px) 100vw, 382px\" \/><\/p>\n<p>AN XOR Gate will only turn on if either (but not both) inputs are on.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-2202\" src=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2022\/01\/XOR-Mini.gif\" alt=\"\" width=\"761\" height=\"383\" \/><\/p>\n<table style=\"background-color: #dadee7; height: 261px;\" width=\"764\">\n<tbody>\n<tr>\n<td style=\"text-align: center;\" colspan=\"3\"><b>NOR Gate Truth Table<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>Input A<\/b><\/td>\n<td><b>Input B<\/b><\/td>\n<td><b>Output<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">0<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n<\/div><h2 class=\"tabtitle\">Practice<\/h2>\n<div class=\"tabcontent\">\n\n<p><iframe loading=\"lazy\" src=\"\/\/scratch.mit.edu\/projects\/embed\/12583438\/?autostart=false\" width=\"800\" height=\"600\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\" data-mce-fragment=\"1\"><\/iframe><\/p>\n\n<\/div><h2 class=\"tabtitle\">Activity 1<\/h2>\n<div class=\"tabcontent\">\n\n<p>Have a go at connecting up multiple logic gates to see what happens, using the simulator below. Can you work out the inputs and outputs for the following examples.<\/p>\n<p><a href=\"https:\/\/academo.org\/demos\/logic-gate-simulator\/\">https:\/\/academo.org\/demos\/logic-gate-simulator\/<\/a><\/p>\n<p><strong>Example 1<\/strong><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-534\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/logic-gate-example-1.png\" alt=\"\" width=\"585\" height=\"261\" \/><\/p>\n<p><strong>Example 2<\/strong><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-533\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/logic-gate-example-2.png\" alt=\"\" width=\"733\" height=\"300\" \/><\/p>\n<p><strong>Example 3<\/strong><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-532\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/logi-gate-example-3.png\" alt=\"\" width=\"710\" height=\"280\" \/><\/p>\n<p><strong>Example 4<\/strong><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-531\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/logi-gate-example-4.png\" alt=\"\" width=\"741\" height=\"463\" \/><\/p>\n<p>&nbsp;<\/p>\n\n<\/div><h2 class=\"tabtitle\">Activity 2<\/h2>\n<div class=\"tabcontent\">\n\n<p><strong>Activity 2 &#8211; Applying Logic Gates<\/strong><\/p>\n<p>Using the link below, see if you can make the following systems:<\/p>\n<p><a href=\"http:\/\/www.neuroproductions.be\/logic-lab\/\">Logic Gates Application Simulator<\/a><\/p>\n<p><strong>System 1 &#8211; Fan cooling system.<\/strong><\/p>\n<p>If the main system switch is turned on, then the fan will operate when:<\/p>\n<ul>\n<li>Every 5 seconds<\/li>\n<li>When The manual override button is pressed.<\/li>\n<\/ul>\n<p><strong>System 2 &#8211; Basic Alarm System<\/strong><\/p>\n<p>Make a system where if any of the 3 sensors (use 3 switches to represent sensors) are triggered, the alarm light will flash RED.<\/p>\n<p><strong>System 3 &#8211; Advanced Alarm System<\/strong><\/p>\n<p>Adapt the system so that:<\/p>\n<ul>\n<li>The alarm will not be triggered if the system has not been armed first (use another switch for this)<\/li>\n<li>The alarm should alternate between flashing red and sound a siren every 1 second.<\/li>\n<\/ul>\n<p><strong>System 4 &#8211; Button operated traffic light.<\/strong><\/p>\n<p>Make a traffic light that starts on green, then goes to amber &#8211; red &#8211; amber &#8211; green again.<\/p>\n<p><em>Hint &#8211; You&#8217;ll need to flip flop!<\/em><\/p>\n\n<\/div><h2 class=\"tabtitle\">Resources<\/h2>\n<div class=\"tabcontent\">\n\n<p><a href=\"https:\/\/www.tes.com\/teaching-resource\/resource-12628657\">End of Topic Test<\/a><\/p>\n<p><a href=\"https:\/\/docs.google.com\/document\/d\/1AfCn8_S-FNIQzRW8XZ18XHJxsdCxy2iQNgMBfahi_NI\/edit?usp=sharing\">Logic Gates Worksheet<\/a><\/p>\n<p><a href=\"https:\/\/www.youtube.com\/watch?v=OQfjIw3mivc\">Starter music &#8211; Logical Song<\/a><\/p>\n<p><a href=\"http:\/\/mr-west.uk\/binary\/wp-content\/uploads\/sites\/17\/2016\/03\/Knights-Vs-Knaves-Starter.docx\">Knights Vs Knaves Starter<\/a><\/p>\n<p><a href=\"https:\/\/play.kahoot.it\/#\/k\/d25345bc-c1cc-4d11-a9cb-81fb3074c3fe\">Logic Gates Kahoot<\/a><\/p>\n<p><a href=\"http:\/\/think-maths.co.uk\/sites\/default\/files\/downloads\/think_maths_domino_computer_worksheets.pdf\">Think maths worksheet<\/a><\/p>\n<p><a href=\"http:\/\/www.neuroproductions.be\/logic-lab\/\">Logic Lab Activity<\/a><\/p>\n<p><a href=\"http:\/\/www.rigb.org\/christmaslectures08\/html\/activities\/all-very-logical.pdf\">CS Unplugged Logic Gates Activity<\/a><\/p>\n<p><a href=\"https:\/\/logic.ly\/demo\/\">Logicly Demo<\/a><\/p>\n<p>Past Paper Exam Questions<\/p>\n<p>J15 Paper 11 Qn 7<\/p>\n<p>N16 Paper 11 Qn5<\/p>\n<p>N19 11 Qn3<\/p>\n<p><a href=\"https:\/\/www.cambridgeinternational.org\/Images\/503434-2021-specimen-paper-1.pdf\">21 Specimen Paper qn 5<\/a><\/p>\n<p>J20 11 qn5a<\/p>\n<p>J18 11 Qn4<\/p>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Introductory Video https:\/\/www.youtube.com\/watch?v=gI-qXk7XojAVideo can&#8217;t be loaded because JavaScript is disabled: Boolean Logic &amp; Logic Gates: Crash Course Computer Science #3 (https:\/\/www.youtube.com\/watch?v=gI-qXk7XojA) &nbsp; &nbsp; NOT Gates A NOT Gate is the simplest form of logic gate. It merely takes the single input and reverses the signal. NOT Gate Truth Table Input A Output 0 1 1&hellip;&nbsp;<a href=\"https:\/\/learnlearn.uk\/alevelcs\/logic-gates-2\/\" class=\"\" rel=\"bookmark\">Read More &raquo;<span class=\"screen-reader-text\">Logic Gates<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"on","neve_meta_content_width":85,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Logic Gates - A Level Computer Science<\/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:\/\/learnlearn.uk\/alevelcs\/logic-gates-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Logic Gates - A Level Computer Science\" \/>\n<meta property=\"og:description\" content=\"Introductory Video https:\/\/www.youtube.com\/watch?v=gI-qXk7XojAVideo can&#8217;t be loaded because JavaScript is disabled: Boolean Logic &amp; Logic Gates: Crash Course Computer Science #3 (https:\/\/www.youtube.com\/watch?v=gI-qXk7XojA) &nbsp; &nbsp; NOT Gates A NOT Gate is the simplest form of logic gate. It merely takes the single input and reverses the signal. 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It merely takes the single input and reverses the signal. 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