A-level Computing 2009/AQA/Computer Components, The Stored Program Concept and the Internet/Fundamental Hardware Elements of Computers/Boolean gate combinations

Logic Gates Building circuits Now you have learnt logic gates we will take a look at how they are combined inside hardware. You may well be asked in an exam to draw your own logic gates or to work out what a combination of logic gates will output. In this section we will look at the best way to describe what a set of logic gates is in boolean algebra. Let's take a look at a quick example: 350px|center Exercise: Logic gate combination outputs For the following logic gate combinations work out output Q for each: File:CPT-logic-gate ex1.svg File:CPT-logic-gate ex1 Answer.svg File:CPT-logic-gate ex2.svg File:CPT-logic-gate ex2 - Answer.svg File:CPT-logic-gate ex3.svg File:CPT-logic-gate ex3 - Answer.svgThis equation can be simplified to equal , as , we'll find out why this is the case in the simplifying boolean equations section coming up File:CPT-logic-gate ex4.svg File:CPT-logic-gate ex4 - Answers.svgThis equation can be simplified to equal 0 (always false), as , we'll find out why this is the case in the simplifying boolean equations section coming up File:CPT-logic-gate ex5.svg File:CPT-logic-gate ex5 - Answers.svg