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Edexcel GCSE Computer Science Unit 3: Computers 2026 | Study Guide, Practice Questions, Answers, Rationales & Exam Review

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Prepare for Edexcel GCSE Computer Science Unit 3: Computers with focused study material covering computer systems, hardware, software, data representation, processing, storage, networking, and essential computing concepts. Includes revision notes, practice questions, answers, and rationales to reinforce key topics and support effective Edexcel GCSE Computer Science exam preparation and review.

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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

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