📚 KS3 WJEC Computing: Core Knowledge Points Review | KS3 WJEC 计算机：核心知识点梳理
This article provides a structured review of the key knowledge points for the KS3 WJEC Computing curriculum. Whether you are preparing for assessments or simply consolidating your understanding, these core concepts will help you build a strong foundation in computer science. Each section is presented in both English and Chinese to support bilingual learners.
本文系统梳理了KS3 WJEC计算机课程的核心知识点。无论你是准备评估还是巩固理解，这些核心概念都将帮助你打下扎实的计算机科学基础。每个小节均以中英双语呈现，以支持双语学习者。
1. Computational Thinking and Algorithms | 计算思维与算法
Computational thinking is a problem-solving approach that involves decomposition, pattern recognition, abstraction, and algorithm design. Decomposition means breaking a complex problem into smaller, manageable parts. For example, planning a school trip can be split into tasks such as booking transport, organising permission slips, and setting a schedule.
计算思维是一种解决问题的思维方法，包括分解、模式识别、抽象和算法设计。分解是指将复杂问题拆分成更小、易于处理的部分。例如，策划一次学校旅行可以分解为预订交通工具、组织家长同意书和安排日程等任务。
Pattern recognition involves identifying similarities or trends within problems. By recognising that a solution used in one area can be applied elsewhere, you can save time and effort. Abstraction focuses on filtering out unnecessary details to concentrate on the essential features of a problem. Algorithm design is the process of creating a step-by-step plan to solve a problem, and it is the heart of programming.
模式识别是指找出问题中的相似性或规律。识别出在一个领域用过的解决方案可以应用到别处，可以节省时间和精力。抽象则是过滤掉不必要的信息，专注于问题的关键特征。算法设计是制定逐步解决问题的计划的过程，也是编程的核心。
An algorithm must be precise, unambiguous, and finite. It can be represented using flowcharts, pseudocode, or written instructions. In WJEC KS3, you will learn to design simple algorithms for everyday tasks and digital systems.
算法必须精确、无歧义且有限。它可以用流程图、伪代码或文字说明来表示。在WJEC KS3阶段，你将学习为日常任务和数字系统设计简单的算法。
2. Programming Basics: Sequence, Selection and Iteration | 编程基础：顺序、选择与迭代
The three fundamental programming constructs are sequence, selection, and iteration. Sequence refers to executing instructions one after another in the order they are written. Every program relies on the correct ordering of steps to achieve a desired outcome.
编程的三种基本结构是顺序、选择和迭代。顺序是指按照编写顺序一条一条地执行指令。每个程序都依赖于步骤的正确排序来实现预期结果。
Selection allows a program to make decisions. It uses conditions (e.g., if the temperature is below 0°C) to choose between different paths. Common selection statements include if, if-else, and elif chains. Iteration, or looping, enables repeated execution of a block of code. while loops continue as long as a condition is true, and for loops run a set number of times or iterate over a collection.
选择结构让程序能够做出决策。它利用条件（例如，如果温度低于0°C）来在不同路径间做出选择。常见的选择语句包括 if、if-else 和 elif 链。迭代（即循环）允许反复执行一段代码。while 循环当条件为真时持续运行，而 for 循环则运行固定次数或遍历集合。
In KS3, you may use visual programming environments like Scratch, where sequence, selection, and iteration are built as blocks. The same logic applies when you transition to text-based languages such as Python, which is also used in WJEC schemes of work.
在KS3中，你可能会使用像Scratch这样的可视化编程环境，顺序、选择和迭代在那里以积木块的形式构建。当你过渡到文本编程语言（如WJEC教学计划中也使用的Python）时，相同的逻辑同样适用。
3. Data Representation: Binary, Bits and Images | 数据表示：二进制、比特与图像
Computers store and process all data as binary numbers (1s and 0s). A single binary digit is called a bit, and eight bits make one byte. Understanding binary is essential for grasping how numbers, text, and multimedia are represented digitally.
计算机将所有数据以二进制数字（1和0）的形式存储和处理。单个二进制位称为比特（bit），八个比特构成一个字节（byte）。理解二进制对于掌握数字、文本和多媒体在数字设备中的表示方式至关重要。
To convert a binary number to decimal, you can add the place values where a 1 appears. For example, the binary number 1010₂ equals (1 × 2³) + (0 × 2²) + (1 × 2¹) + (0 × 2⁰) = 8 + 0 + 2 + 0 = 10 in decimal. The subscript ₂ indicates binary base. The conversion from decimal to binary can be done by repeatedly dividing by 2 and recording the remainder.
将二进制数转换为十进制，可以将出现1的位置对应的位权相加。例如，二进制数 1010₂ 等于 (1 × 2³) + (0 × 2²) + (1 × 2¹) + (0 × 2⁰) = 8 + 0 + 2 + 0 = 10（十进制）。下标 ₂ 表示二进制基数。从十进制转换为二进制可以通过反复除以2并记录余数来实现。
Image representation at KS3 level often involves thinking of an image as a grid of pixels, where each pixel has a binary code for its colour. In a simple black-and-white image, 0 could represent white and 1 black. With more bits per pixel, more colours can be represented. Sound can be sampled and converted into binary streams as well, but the focus is on the principle that all data ultimately reduces to bits.
在KS3阶段，图像表示通常将图像视为像素网格，每个像素都有一个表示其颜色的二进制代码。在简单的黑白图像中，0可以表示白色，1表示黑色。每个像素使用的位数越多，可以表示的颜色就越多。声音也可以被采样并转换为二进制数据流，但重点在于理解所有数据最终都归结为比特这一原则。
4. Boolean Logic and Simple Gates | 布尔逻辑与简单门电路
Boolean logic deals with values that are either TRUE or FALSE. It is foundational for decision-making in programs and for designing digital circuits. The basic logical operators are AND, OR, and NOT. Truth tables are used to show all possible outcomes of these operations.
布尔逻辑处理只有真（TRUE）或假（FALSE）两种值的运算。它是程序决策和数字电路设计的基础。基本的逻辑运算符包括AND（与）、OR（或）和NOT（非）。真值表则用于展示这些运算的所有可能结果。
An AND operation returns TRUE only if both inputs are TRUE. An OR operation returns TRUE if at least one input is TRUE. NOT simply reverses the input: TRUE becomes FALSE, and vice versa. For example, the expression (A AND B) OR NOT(C) will evaluate to TRUE when A and B are both True, or when C is False.
AND运算只有当两个输入都为TRUE时才返回TRUE。OR运算只要至少有一个输入为TRUE就返回TRUE。NOT运算则简单地反转输入：TRUE变为FALSE，FALSE变为TRUE。例如，表达式 (A AND B) OR NOT(C) 当A和B都为True或C为False时，结果将为TRUE。
Simple logic gates (AND, OR, NOT) are the building blocks of processors. In KS3, you might use interactive simulations to see how combining gates creates more complex circuits like adders. Understanding Boolean logic also helps when writing conditional statements in code, making your programs more robust.
简单的逻辑门（AND、OR、NOT）是处理器的基本构件。在KS3中，你可能会使用交互式模拟来观察如何组合门电路以创建更复杂的电路，例如加法器。理解布尔逻辑还有助于在编写代码的条件语句时使程序更加健壮。
5. Computer Hardware and Components | 计算机硬件与组件
Computer hardware refers to the physical parts of a computer system. Key components include the central processing unit (CPU), memory (RAM and ROM), storage devices, input devices, and output devices. The CPU, often described as the ‘brain’ of the computer, executes instructions by performing the fetch-decode-execute cycle.
计算机硬件指的是计算机系统的物理部件。关键组件包括中央处理器（CPU）、内存（RAM和ROM）、存储设备、输入设备和输出设备。CPU通常被形容为计算机的“大脑”，它通过执行取指-解码-执行的循环来处理指令。
RAM (Random Access Memory) is volatile memory that temporarily holds data and programs currently in use. ROM (Read-Only Memory) is non-volatile and stores essential boot-up instructions called firmware. Storage devices like hard disk drives (HDD) and solid-state drives (SSD) provide long-term data retention. Input devices (keyboard, mouse, microphone) send data to the system, while output devices (monitor, printer, speakers) display or convey results.
RAM（随机存取存储器）是易失性存储器，临时保存当前正在使用的数据和程序。ROM（只读存储器）是非易失性存储器，存储着称为固件的启动指令。像硬盘驱动器（HDD）和固态驱动器（SSD）这类存储设备提供长期数据保存。输入设备（键盘、鼠标、麦克风）将数据发送到系统，而输出设备（显示器、打印机、音箱）则显示或传达结果。
In WJEC KS3, you should be able to identify common hardware and explain their purposes. You may also explore embedded systems, such as those in washing machines or traffic lights, where a dedicated microcontroller runs a single program continually.
在WJEC KS3中，你应能识别常见硬件并解释其用途。你还可能探索嵌入式系统，例如洗衣机或交通信号灯中的系统，这些设备中的专用微控制器持续运行单一程序。
6. Software: Operating Systems and Applications | 软件：操作系统与应用
Software is the collection of programs and data that tell the hardware what to do. It can be divided into system software and application software. The operating system (OS) is the most critical system software, managing hardware resources, providing a user interface, and enabling multitasking.
软件是指示硬件如何工作的程序与数据的集合，可分为系统软件和应用软件。操作系统（OS）是最关键的系统软件，它管理硬件资源、提供用户界面并支持多任务处理。
Common OS functions include file management, memory management, and handling input/output operations. Examples are Microsoft Windows, macOS, Linux, and iOS. Application software serves specific user needs, such as word processors, web browsers, games, and spreadsheets. Utilities are a category of system software that performs maintenance tasks like antivirus scanning or disk defragmentation.
操作系统的常见功能包括文件管理、内存管理以及处理输入/输出操作。常见操作系统包括Microsoft Windows、macOS、Linux和iOS。应用软件则满足特定用户需求，如文字处理器、网页浏览器、游戏和电子表格。实用程序是执行维护任务（如防病毒扫描或磁盘碎片整理）的一类系统软件。
At KS3, you will also learn about open source versus proprietary software and the importance of keeping software updated to maintain security and performance.
在KS3阶段，你还将学习开源软件与专有软件的区别，以及保持软件更新以维护安全性和性能的重要性。
7. Networks and the Internet | 网络与互联网
A computer network is two or more computers connected together to share resources and data. Networks can be classified by their geographical size: a LAN (Local Area Network) covers a small area like a school, while a WAN (Wide Area Network) spans large distances, such as the internet itself.
计算机网络是指两台或更多计算机连接在一起以共享资源和数据。网络可按地理范围分类：局域网（LAN）覆盖学校等小范围区域，而广域网（WAN）跨越较大距离，如互联网本身。
Key networking hardware includes routers, switches, and network interface cards (NICs). Data travels across networks in small units called packets, following rules defined by protocols such as TCP/IP. The internet is a global WAN that connects millions of networks. The World Wide Web is a service that runs on the internet, allowing access to web pages using HTTP/HTTPS.
关键的网络硬件包括路由器、交换机和网络接口卡（NIC）。数据以称为数据包的小单元在网络中传输，遵循TCP/IP等协议所定义的规则。互联网是一个连接数百万个网络的全球广域网。万维网是运行在互联网上的一项服务，允许使用HTTP/HTTPS访问网页。
Understanding how networks function helps you appreciate issues like bandwidth, latency, and the importance of encryption. You will also discuss the role of DNS (Domain Name System) in translating web addresses into IP addresses.
了解网络的功能有助于你理解带宽、延迟以及加密的重要性。你还将讨论DNS（域名系统）在将网址转换为IP地址方面的作用。
8. Digital Literacy and Online Safety | 数字素养与网络安全
Digital literacy goes beyond basic IT skills; it includes the ability to find, evaluate, and communicate information online responsibly. In WJEC KS3, you are expected to practise effective search techniques, recognise reliable sources, and understand the implications of digital footprints.
数字素养不仅仅是基本的IT技能，还包括负责任地在线查找、评估和交流信息的能力。在WJEC KS3中，你需要练习有效的搜索技巧，识别可靠来源，并理解数字足迹的影响。
Online safety covers protecting personal information, recognising phishing and scams, and dealing with cyberbullying. Strong passwords, two-factor authentication, and critical thinking about unsolicited messages are essential habits. You should never share personal details like your address or phone number without parental consent.
网络安全涵盖保护个人信息、识别钓鱼和欺诈以及应对网络欺凌。强密码、双因素认证和对垃圾信息进行批判性思考是必不可少的习惯。未经父母同意，你绝不应分享地址或电话号码等个人详细信息。
Social media and gaming platforms can be fun, but it is vital to adjust privacy settings and report inappropriate behaviour. Respecting others online and understanding that what you post can be permanent are key parts of being a responsible digital citizen.
社交媒体和游戏平台可能很有趣，但至关重要的是调整隐私设置并举报不当行为。尊重他人，理解你所发布内容可能是永久的，这是负责任的数字公民的关键组成部分。
9. Ethics and Legal Issues in Computing | 计算机伦理与法律问题
As computing becomes more integrated into daily life, ethical considerations grow in importance. KS3 students should be aware of the Computer Misuse Act, which makes unauthorised access to computer systems illegal. Hacking, spreading viruses, and cyberbullying can have serious legal consequences.
随着计算机越来越融入日常生活，伦理考量变得愈加重要。KS3学生应了解《计算机滥用法》，该法将未经授权访问计算机系统定为非法。黑客攻击、传播病毒和网络欺凌都可能带来严重的法律后果。
Copyright and plagiarism are also critical topics. Using someone else’s work (music, images, text) without permission or proper attribution is not only unethical but can violate copyright law. Creative Commons licences provide a way for creators to share their work with certain conditions, and you should learn to cite sources properly in your projects.
版权和抄袭也是关键主题。未经许可或适当署名使用他人作品（音乐、图片、文字）不仅不道德，而且可能违反版权法。知识共享许可提供了一种创作者在特定条件下分享作品的方式，你应该学会在项目中正确引用来源。
The digital divide—the gap between those who have access to technology and those who do not—raises ethical questions about fairness and opportunity. You will also reflect on environmental impacts, such as the energy consumption of data centres and e-waste. These discussions help you become a thoughtful and informed user of technology.
数字鸿沟（即能够接触技术与不能接触技术的人们之间的差距）提出了关于公平和机会的伦理问题。你还将思考环境影响，如数据中心的能源消耗和电子废弃物。这些讨论有助于你成为一名深思熟虑且见多识广的技术使用者。
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