{"id":304,"date":"2020-03-04T11:50:56","date_gmt":"2020-03-04T11:50:56","guid":{"rendered":"http:\/\/learnlearn.uk\/alevelcs\/?page_id=304"},"modified":"2021-03-26T06:36:10","modified_gmt":"2021-03-26T06:36:10","slug":"logic-gates","status":"publish","type":"page","link":"https:\/\/learnlearn.uk\/alevelcs\/logic-gates\/","title":{"rendered":"Logic Gates"},"content":{"rendered":"<div class=\"responsive-tabs\">\n<h2 class=\"tabtitle\">Introduction<\/h2>\n<div class=\"tabcontent\">\n\n<h3>Introduction 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<h3>Truth Tables<\/h3>\n<p>When we are working out what possibilities exist for a particular Boolean logic structure, we can use a truth table to represent that data.<\/p>\n<p>Using the previous example we can produce a simple truth table for the results.<\/p>\n<table width=\"413\">\n<tbody>\n<tr>\n<td width=\"160\"><strong>Input<\/strong><\/td>\n<td width=\"160\"><strong>Output<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"160\"><strong>1<\/strong><\/td>\n<td width=\"160\">1<\/td>\n<\/tr>\n<tr>\n<td width=\"160\"><strong>0<\/strong><\/td>\n<td width=\"160\">0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n\n<\/div><h2 class=\"tabtitle\">AND<\/h2>\n<div class=\"tabcontent\">\n\n<p><strong>AND Gates<\/strong><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-medium wp-image-487\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/and-gate-300x108.png\" alt=\"\" width=\"300\" height=\"108\" \/><\/p>\n<p>A Boolean AND gate works by the following rules:<\/p>\n<ol>\n<li>If both inputs are true, then the output will be True.<\/li>\n<li>Otherwise the output will be false<\/li>\n<\/ol>\n<p><strong>Scratch Example<\/strong><\/p>\n<p><a href=\"http:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/boolean-and-scratch.png\" rel=\"attachment wp-att-128\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-128\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/boolean-and-scratch.png\" alt=\"boolean and scratch\" width=\"523\" height=\"157\" \/><\/a><\/p>\n<p><strong>Challenge 1 &#8211; AND Gate truth table<\/strong><\/p>\n<p>Can you fill out the truth table for an AND gate?<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-490\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/blank-truth-table.png\" alt=\"\" width=\"747\" height=\"183\" \/><\/p>\n<div class=\"arconix-toggle-wrap\"><div class=\"arconix-toggle-title toggle-closed\"><i class='fa fa-plus-square'><\/i>Click to check your answer<\/div><div class=\"arconix-toggle-content\">\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-491\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/truth-table-AND-gate-OCR.png\" alt=\"\" width=\"746\" height=\"187\" \/><\/p>\n<\/div><\/div>\n\n<\/div><h2 class=\"tabtitle\">OR<\/h2>\n<div class=\"tabcontent\">\n\n<p><strong>OR Gates<\/strong><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-medium wp-image-488\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/or-gates-300x108.png\" alt=\"\" width=\"300\" height=\"108\" \/><\/p>\n<p>A Boolean OR gate works by the following logic:<\/p>\n<ol>\n<li>If either input is True, the output is True.<\/li>\n<li>If both inputs are True, the output is True.<\/li>\n<li>Otherwise the output is false.<\/li>\n<\/ol>\n<p><strong>Scratch Example<\/strong><\/p>\n<p><a href=\"http:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/boolean-or-scratch.png\" rel=\"attachment wp-att-129\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-129\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/boolean-or-scratch.png\" alt=\"boolean or scratch\" width=\"517\" height=\"156\" \/><\/a><\/p>\n<p><strong>Challenge 2 &#8211;\u00a0Can you work out\u00a0the truth table for a Boolean OR gate?<\/strong><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-490\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/blank-truth-table.png\" alt=\"\" width=\"747\" height=\"183\" \/><br \/>\n<div class=\"arconix-toggle-wrap\"><div class=\"arconix-toggle-title toggle-closed\"><i class='fa fa-plus-square'><\/i>Click to check your answer!<\/div><div class=\"arconix-toggle-content\">\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-492\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/OR-gate-truth-table-ocr-gcse.png\" alt=\"\" width=\"736\" height=\"183\" \/><\/p>\n<\/div><\/div><\/p>\n\n<\/div><h2 class=\"tabtitle\">NOT<\/h2>\n<div class=\"tabcontent\">\n\n<h3>NOT Gate<\/h3>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-medium wp-image-489\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/not-gate-300x108.png\" alt=\"\" width=\"300\" height=\"108\" \/><\/p>\n<p>A Boolean NOT gate simply reverses whatever input is given.<\/p>\n<ol>\n<li>If the input is True, the output is False<\/li>\n<li>If the input is False, the output is True<\/li>\n<\/ol>\n<p><strong>Scratch Not gate Example<\/strong><\/p>\n<p><a href=\"http:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/scratch-boolean-not.png\" rel=\"attachment wp-att-133\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-133\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/scratch-boolean-not.png\" alt=\"scratch boolean not\" width=\"324\" height=\"160\" \/><\/a><\/p>\n<p><strong>Challenge 3 &#8211;\u00a0Can you write a truth table for a NOT gate?<\/strong><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-493\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/not-gate-blank.png\" alt=\"\" width=\"742\" height=\"125\" \/><\/p>\n<div class=\"arconix-toggle-wrap\"><div class=\"arconix-toggle-title toggle-closed\"><i class='fa fa-plus-square'><\/i>Click to check your answer!<\/div><div class=\"arconix-toggle-content\">\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-494\" src=\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/truth-table-not-gate-ocr.png\" alt=\"\" width=\"748\" height=\"138\" \/><\/p>\n<\/div><\/div>\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:\/\/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>&nbsp;<\/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<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction 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; Truth Tables When we are working out what possibilities exist for a particular Boolean logic structure, we can use a truth table to represent that data. Using the previous example we can&hellip;&nbsp;<a href=\"https:\/\/learnlearn.uk\/alevelcs\/logic-gates\/\" 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":"","neve_meta_content_width":70,"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\/\" \/>\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=\"Introduction 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; Truth Tables When we are working out what possibilities exist for a particular Boolean logic structure, we can use a truth table to represent that data. 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