Revision notes, activities, lesson plans, teaching ideas, and other resources for GCSE, A-Level, and IB Computer Science teachers and students.
UK Computing Laws
This video from Computer Science Tutor covers the main UK computing laws re...
Wireless Networking (Wi-Fi, Security, and Hardware)
This video about wireless networking includes everything that is needed for...
Network topology videos
These four excellent videos from Computer Science tutor cover the four ma...
These four videos explain the main networking protocols that students are l...
Embedded Systems video
This short video is a good over of embedded systems, covering the main poin...
Representing Text in Binary
This video clearly explains the two main ways of representing text in binar...
Types of Malware
This video explains the various types of malware including viruses and troj...
Protecting against Malware
Following on from the Types of Malware video, this video explains technique...
Video: Network Security #1
This video gives an overview of the threats to networked computer systems, ...
Click here for recommended AQA A-Level Computer Science textbooks.
This video contains lots of examples of converting binary numbers to decimal numbers, and vice versa. A good revision guide.
Unsigned binary arithmetic
Binary Addition & Overflow
Another excellent video from ComputerPhile with their usual clear explanations and worked examples. This video recaps binary numbers and then explains how to perform binary addition. It also deals with the potential problem of overflow and how it can be handled.
Signed binary using two’s complement
Why we use Two's Complement
This video explains how to represent negative numbers in binary. It explains why we can't use a simple sign bit to represent positive or negative numbers, and then looks at how one's complement solves this problem. Finally it explained how two's complement works and why it is used. Although the beginning of the video goes into a lot of detail, it is useful to understand exactly why two's complement is needed and used.
Numbers with a fractional part
A-Level appendix unit - PG Online
Floating point numbers, adders, D-type flip flops are covered in this free lesson resource unit from PG Online. The presentations and activities are designed for the AQA AS and A-Level courses, but the content is relevant to other A-Level courses too.
A-Level only content
Absolute and relative errors
Normalisation of floating point form