AQA Computer Science Binary Revision Notes
Master AQA Computer Science Binary using simple revision notes, key facts and practice questions — all generated by AI for your exam.
Binary is the fundamental language of computers, consisting of only two digits: 0 and 1. It is used to represent all types of data in computing, from numbers to text and images.
Key Concepts
- 1Binary is a base-2 numeral system.
- 2Each binary digit (bit) represents a power of 2.
- 3Data in computers is stored as binary values.
- 4Conversions between binary and decimal are essential.
- 5Binary arithmetic is used for calculations in computers.
Simple Explanation
Binary is a way of counting using only two numbers: 0 and 1. Computers use binary because they work with electrical signals that can be either off (0) or on (1). Every piece of information, like text or images, is converted into a long string of these 0s and 1s. This makes it possible for computers to process and store data efficiently.
Memory Trick
“Think of binary as a light switch: it can either be off (0) or on (1). Just like a switch can represent two states, binary represents data using two digits.”
Flashcards
What is binary?
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Exam Questions
Describe and explain how binary is used in computing. [6 marks]
6 marksView mark scheme hint▾
Explain binary representation, its role in data storage and processing, and conversions to/from decimal.
Explain how binary arithmetic works. [4 marks]
4 marksView mark scheme hint▾
Discuss binary addition, carry-over, and examples.
What is meant by the term 'byte'? [2 marks]
2 marksView mark scheme hint▾
Define a byte and its relation to bits.
Practice Quiz
What is the binary representation of the decimal number 10?
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