Year 10 - Computing
Why do computers use binary?
Representation of numbers
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
In this unit pupils will be reminded of how the base-10 number system works before being introduced to the base-2 number system. They will perform conversions between binary and decimal and recognise the rules of binary addition and subtraction. They will be introduced to hexadecimal and its uses.
Lesson Summary
You will learn to explain why computers use binary to represent all data and instructions.
Key Notes
- Computers use binary to represent all data and instructions.
- Binary is a number system consisting of 1s and 0s.
- Binary can be represented by two-state electrical signals within circuits.
- A transistor that is "on" represents a 1; a transistor that is "off" represents a 0.
Vocabulary To Learn
- data: facts and figures in their raw form
- binary: a number system that uses the digits 0 and 1 to represent data
- instruction: directions on how to carry out a specific task
- transistor: a tiny electronic switch controlled by electricity
Common Mistakes To Avoid
- Computers use binary for data and instructions but they can use other number systems just as easily.
3 Quick Questions (With Answers)
1. Describe the system or process from this lesson in clear steps.
Computers use binary to represent all data and instructions. Binary is a number system consisting of 1s and 0s.
2. Define this computing term and give one practical example. 'data'
facts and figures in their raw form. Add one real device or system example to prove understanding.
3. Correct this common computing misconception.
Mistake: Computers use binary for data and instructions but they can use other number systems just as easily. Correction: Computers have to use binary as they are powered by electrical circuits which contain transistors which can be switched on and off using electricity. Using other number systems would require more complex circuitry.
More Lessons In This Unit
Browse all guides in the Year 10 Computing guide library.