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EnglandComputer Science

Topic 3: Computers

6 dot points across 6 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

What is an embedded system, and what are embedded systems used for?

Understand the concept of an embedded system and what embedded systems are used for.
A focused answer to Edexcel GCSE Computer Science 3.1.3, covering what an embedded system is, how it differs from a general-purpose computer, and the uses of embedded systems with examples.
8 min answer →

What is the purpose of an operating system, and what does it do?

Understand the purpose and functionality of an operating system (file management, process management, peripheral management, user management).
A focused answer to Edexcel GCSE Computer Science 3.2.1, covering the purpose of an operating system and its four key functions: file management, process management, peripheral management and user management.
9 min answer →

What is the difference between low-level and high-level languages, and how does an interpreter differ from a compiler?

Understand the characteristics and purposes of low-level and high-level programming languages, and how an interpreter differs from a compiler in the way it translates high-level code into machine code.
A focused answer to Edexcel GCSE Computer Science 3.3.1 and 3.3.2, covering the characteristics of low-level and high-level programming languages and the difference between a compiler and an interpreter.
9 min answer →

Why do computers need secondary storage, and how do magnetic, optical and solid-state devices store data?

Understand the role of secondary storage and the ways in which data is stored on devices (magnetic, optical, solid state).
A focused answer to Edexcel GCSE Computer Science 3.1.2, covering the role of secondary storage and how magnetic, optical and solid-state devices store data, with their advantages and uses.
9 min answer →

What does utility software do, and how do we develop robust software and find its vulnerabilities?

Understand the purpose and functionality of utility software (file repair, backup, data compression, disk defragmentation, anti-malware), and the importance of developing robust software and methods of identifying vulnerabilities (audit trails, code reviews).
A focused answer to Edexcel GCSE Computer Science 3.2.2 and 3.2.3, covering utility software (file repair, backup, compression, defragmentation, anti-malware) and developing robust software with audit trails and code reviews.
9 min answer →

What is the von Neumann stored program concept, and how do the CPU, memory and buses carry out the fetch-decode-execute cycle?

Understand the von Neumann stored program concept and the role of main memory (RAM), the CPU (control unit, arithmetic logic unit, registers), the clock and the address, data and control buses in the fetch-decode-execute cycle.
A focused answer to Edexcel GCSE Computer Science 3.1.1, covering the von Neumann stored program concept, the roles of RAM, the CPU (control unit, ALU, registers), the clock and the three buses in the fetch-decode-execute cycle.
10 min answer →