- Starter<\/a><\/li>\n
- Boolean Logic<\/a><\/li>\n
- Truth Tables<\/a><\/li>\n
- AND<\/a><\/li>\n
- OR<\/a><\/li>\n
- NOT<\/a><\/li>\n
- Practice Game<\/a><\/li>\n
- Activity 1<\/a><\/li>\n
- Activity 2<\/a><\/li>\n
- Resources<\/a><\/li><\/ul>\n
\nLogic gates and Truth Tables Starter<\/h3>\n
![\"\"](\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/Helmeted_Medieval_Knight_or_Soldier_(1).JPG\")
<\/p>\nYou are stranded on an Island when you bump in to 3 people. Of the three people\u00a0(Alice, Bill, Charlie):<\/p>\n
- \n
- One is a knight<\/li>\n
- One is a knave<\/li>\n
- One is a spy<\/li>\n<\/ul>\n
On this island:<\/p>\n
- \n
- Knights always tell the truth<\/li>\n
- Knaves always lie<\/li>\n
- Spies can do either<\/li>\n<\/ul>\n
<\/p>\n
Alice\u00a0says: “Charlie is a knave.<\/em>”<\/p>\n
Bill\u00a0says: “Alice is a knight<\/em>.”<\/p>\n
Charlie says: “I am the spy.<\/em>”<\/p>\n
Who is the knight, who the knave, and who the spy?<\/strong><\/p>\n<\/div>\n
\nBoolean Logic<\/h3>\n
All data stored in computer systems is stored in binary format, which means that any calculations that are made must be done using only True<\/strong> and False<\/strong> values, this is known as Boolean<\/strong> logic.<\/p>\n
Take for the instance the set up below:<\/p>\n
![\"boolean](\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/boolean-example1.png\")
<\/a><\/p>\nWhen we run the code above, scratch will either say “True” or “False”, depending on whether you press the let arrow key.<\/p>\n
<\/p>\n<\/div>\n
\nTruth Tables<\/h3>\n
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
Using the previous example we can produce a simple truth table for the results.<\/p>\n
\n\n
\n Input<\/strong><\/td>\n Output<\/strong><\/td>\n<\/tr>\n \n 1<\/strong><\/td>\n 1<\/td>\n<\/tr>\n \n 0<\/strong><\/td>\n 0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n <\/p>\n<\/div>\n
\nAND Gates<\/strong><\/p>\n
![\"\"](\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/and-gate-300x108.png\")
<\/p>\nA Boolean AND gate works by the following rules:<\/p>\n
- \n
- If both inputs are true, then the output will be True.<\/li>\n
- Otherwise the output will be false<\/li>\n<\/ol>\n
Scratch Example<\/strong><\/p>\n
![\"boolean](\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/boolean-and-scratch.png\")
<\/a><\/p>\nChallenge 1 – AND Gate truth table<\/strong><\/p>\n
Can you fill out the truth table for an AND gate?<\/p>\n
![\"\"](\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/blank-truth-table.png\")
<\/p>\n<\/i>Click to check your answer<\/div>\n![\"\"](\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/truth-table-AND-gate-OCR.png\")
<\/p>\n<\/div><\/div>\n<\/div>\n\nOR Gates<\/strong><\/p>\n
![\"\"](\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/or-gates-300x108.png\")
<\/p>\nA Boolean OR gate works by the following logic:<\/p>\n
- \n
- If either input is True, the output is True.<\/li>\n
- If both inputs are True, the output is True.<\/li>\n
- Otherwise the output is false.<\/li>\n<\/ol>\n
- Boolean Logic<\/a><\/li>\n
![\"boolean](\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/boolean-or-scratch.png\")
<\/a><\/p>\n![\"\"](\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/OR-gate-truth-table-ocr-gcse.png\")
<\/p>\n<\/div><\/div><\/p>\n<\/div>\n![\"\"](\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/not-gate-300x108.png\")
<\/p>\n![\"scratch](\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/scratch-boolean-not.png\")
<\/a><\/p>\n![\"\"](\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/not-gate-blank.png\"){kind=spacer}
<\/p>\n![\"\"](\"https:\/\/learnlearn.uk\/gcsecs\/wp-content\/uploads\/sites\/8\/2018\/01\/truth-table-not-gate-ocr.png\")
<\/p>\n<\/div><\/div>\n<\/div>\n