That Blue Square Thing - AQA GCSE Computer Science

Syllabus content:

Unit 4 Boolean logic content – just this section

Note: this syllabus content is a slightly amended version of the one published freely on the web by AQA. I have made very minor adjustments to remove some content less suitable for students to use and it is presented here simply to allow the children I teach to download a usable copy of the syllabus content. It is copyright AQA and reproduced here simply to make access easier for students. No attempt to claim copyright is being made, although I could have copied the text into my own interpretation...

AQA Computer Science GCSE

This page is up to date for the AQA 8525 syllabus for exams from 2022.

4.2 Computer Systems – Boolean Logic Gates

Boolean Logic Gates are electronic components which can take Boolean inputs and provide an output – again as a Boolean value. Remember, Boolean values are either True or False.

Logic Gates – intro slides from class

There are four logic gates you need to know: AND, OR, XOR (the evil one) and NOT (the "easy" one which you'll get wrong more times than you think).

Each logic gate has a truth table that you need to know.

Truth tables – an intro on how they work

How logic symbols work – a short intro

Four Logic Gates – a slide on each to make notes from

There's also a textbook double page on these, which will help if you get confused or stuck.

Logic Gates Textbook – a double page spread with questions

A table – can you fill it in correctly?

Truth Table Questions

Logic Gates and Circuits

You might have to draw a simple logic circuit diagram in an exam.

Logic Expressions – types of question

Logic Diagrams – types of question

Example logic gates – with images

An alternate way asking this sort of question:

Blank gates – another way of asking similar questions

A revision exercise:

Logic Quickfire – slides from class

More complex Truth Tables

Truth tables get more complex when you start to do more things to the inputs. And especially when you start to add a third input.

Slightly more complex Truth Tables – a set of exercises to work through