Edexcel GCSE Computer
Science Unit 3: Computers
2026 | Study Guide,
Practice Questions,
Answers, Rationales &
Exam Review | Complete
Ethics Study Guide
Updated 2026 Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales
Included
, von Neumann architecture Computer design where processing instructions are stored in memory; the stored
program concept
Central Processing Unit (CPU) Hardware that carries out the computer's processing
Bus Group of connections between devices in a computer
ALU Arithmetic / logic unit: part of the CPU that performs calculations and logic
operations
Register Storage location inside the CPU used to hold an instruction, an address or other
single data items
Control unit Part of the CPU that organises other parts of the CPU
Clock Part of the CPU that synchronises the actions of the CPU
Main memory / Random Access Memory (RAM) Temporary storage for data and instructions
Volatile memory Memory that is lost when the power is switched off, RAM is volatile
Science Unit 3: Computers
2026 | Study Guide,
Practice Questions,
Answers, Rationales &
Exam Review | Complete
Ethics Study Guide
Updated 2026 Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales
Included
, von Neumann architecture Computer design where processing instructions are stored in memory; the stored
program concept
Central Processing Unit (CPU) Hardware that carries out the computer's processing
Bus Group of connections between devices in a computer
ALU Arithmetic / logic unit: part of the CPU that performs calculations and logic
operations
Register Storage location inside the CPU used to hold an instruction, an address or other
single data items
Control unit Part of the CPU that organises other parts of the CPU
Clock Part of the CPU that synchronises the actions of the CPU
Main memory / Random Access Memory (RAM) Temporary storage for data and instructions
Volatile memory Memory that is lost when the power is switched off, RAM is volatile
