CPU - GCSE Computer Science Definition

What is the CPU?

In GCSE Computer Science, the CPU (Central Processing Unit) is defined as the brain of the computer and its job is to take an input, process data and produce an output.

The purpose of the CPU is to fetch, decode and execute instructions and is made up of 4 key components:

• Arithmetic Logic Unit (ALU)

• Control Unit (CU)

• Cache

• Registers

The performance of a CPU can be impacted by their shared common characteristics:

• Clock Speed

• Cache Size

• Number of Cores

CPU Revision Resources to Ace Your Exams

Explore the CPU in more detail and master other key related terms such as the fetch-decode-execute cycle in our revision note pages here:

The purpose of the CPU (OCR GCSE Computer Science)
Fetch-execute cycle (AQA GCSE Computer Science)
CPU components & their function (Edexcel GCSE Computer Science)

Challenge yourself with our expertly created topic questions and reinforce your learning with our interactive flashcards. 

GCSE Computer Science Revision Resources