from The Open University
Alternatively you can skip the navigation by pressing 'Enter'.
Catching History's Criminals: The Forensics Story: Traces Of GuiltSaturday, 28th November 2015 23:00 - BBC FourAs Gabriel Weston discovers: every contact leaves a trace... Read more: Catching History's Criminals: The Forensics Story: Traces Of Guilt
The Hunt: Episode 4: Hunger at SeaSunday, 29th November 2015 16:50 - BBC One
Ireland with Simon Reeve: Episode 2Sunday, 29th November 2015 20:00 - BBC Two
Power to the People: Episode 3: The Customer is Always RightTuesday, 1st December 2015 21:00 - BBC Four
Catching History's Criminals: The Forensics Story: Traces Of GuiltAvailable until Tuesday, 29th December 2015 00:00As Gabriel Weston discovers: every contact leaves a trace... Read more: Catching History's Criminals: The Forensics Story: Traces Of Guilt
BBC Inside Science: Astronomy Q&A, CERN and ancient genomesAvailable for over a year
All in the Mind: Mindfulness, porn addiction and slothfulnessAvailable for over a year
Power to the People: Episode 2: It's Not Easy Being GreenAvailable until Friday, 25th December 2015 04:00
Star Wars VII: Myth and fairy taleWhat storytelling styles and genres can be applied to Star Wars. Sarah Haslam investigates... Read more: Star Wars VII: Myth and fairy tale
OpenLearn Live: 27th November 2015The oldest parish in Ireland - then more free learning through the day. Read more: OpenLearn Live: 27th November 2015
Introduction to ecosystemsIf we don’t grasp why ecosystems function, it becomes harder to determine possible reasons for... Try: Introduction to ecosystems now
English: skills for learningThis course is for anybody who is thinking of studying for a university degree and would like to... Try: English: skills for learning now
Representing and manipulating data in computers
Computers are all around us: in cars, kitchen scales, digital cameras, etc. But how do...
Computers are all around us: in cars, kitchen scales, digital cameras, etc. But how do they store the data they hold? This unit will help you to understand how the data in a computer represents something in the outside world. You will also explore how ASCII code and Unicode are used to control data.
After studying this unit you will:
- know what all the terms highlighted in bold in the text mean;
- know how the following types of data are represented in a computer, and what the limitations of such representations are: positive and negative integers; fractions; analogue physical quantities such as weight; true/false quantities; still pictures; text; moving pictures; sound;
- know, at an introductory level, what data compression is and why it is useful;
- know, at an introductory level, how input and output subsystems support the conversion of various types of information to and from data types usable by a computer;
- describe what a computer program is and how it utilises the memory and the processor;
- use a flowchart to describe the implementation of a given task;
- perform calculations relating to file sizes for text, still images, moving images and sound;
- convert between binary and denary representations for both positive and negative integers;
- perform simple arithmetic operations on pairs of 8-bit binary numbers;
- find the 2’s complement of a given binary number;
- perform the NOT operation on 8-bit binary codes, and the AND, OR and XOR logic operations on pairs of 8-bit binary codes.
- Current section: Introduction
- Learning outcomes
- 1 Representing data in computers: introduction
- 2 Representing data in the kitchen scales
- 2.1 Introduction
- 2.2 Representing numbers: positive integers
- 2.3 Representing numbers: fractions
- 2.4 Representing numbers: negative integers
- 2.5 Representing weights
- 2.6 Representing true/false quantities
- 2.7 Input and output considerations
- 3 Representing data in the digital camera
- 4 Representing data in the PC
- 5 Representing data in computers: conclusion
- 6 Manipulating data in computers: introduction
- 7 Binary arithmetic
- 8 Logic operations
- 9 Conclusion
Study this free course
Enrol to access the full course, get recognition for the skills you learn and track your progress. Make your learning visible!
Representing and manipulating data in computers
Computers are designed to receive, store, manipulate and present data. This unit explains how computers do this, with reference to the examples of a PC, kitchen scales and a digital camera. In particular it explores the idea that the data in a computer represents something in the real world.
This unit is from our archive and is an adapted extract from Computers and processors (T224) which is no longer taught by The Open University. If you want to study formally with us, you may wish to explore other courses we offer in.
This is an extract from an Open University course which is no longer available to new students. If you found this interesting you could explore more free Computing courses or view the range of currently available OU Computing courses.
Copyright & revisions
Originally published: Thursday, 30th June 2011
Last updated on: Wednesday, 10th October 2012
- Creative-Commons: The Open University is proud to release this free course under a Creative Commons licence. However, any third-party materials featured within it are used with permission and are not ours to give away. These materials are not subject to the Creative Commons licence. See terms and conditions. Full details can be found in the Acknowledgements section.
- This site has Copy Reuse Tracking enabled - see our FAQs for more information.
If you enjoyed this, why not follow a feed to find out when we have new things like it? Choose an RSS feed from the list below. (Don't know what to do with RSS feeds?)
Remember, you can also make your own, personal feed by combining tags from around OpenLearn.