📚 Year 7 CCEA Engineering: Core Knowledge Review | Year 7 CCEA 工程：核心知识点梳理
Engineering is all around us – from the bridges we cross to the phones we use. In Year 7, the CCEA Engineering curriculum lays the foundation by helping you explore how things are designed, built, and powered. This article brings together all the essential topics you will meet, explained in clear, simple terms so you can feel confident in lessons and assessments.
工程无处不在——从我们走过的桥梁到使用的手机。七年级 CCEA 工程课程为你打下基础，帮助你探索事物的设计、建造和驱动原理。本文汇集了你将接触到的所有核心知识点，用清晰易懂的语言讲解，让你在课堂和考试中更有信心。
1. What is Engineering? | 什么是工程？
Engineering is the use of science and maths to design, build, and improve things. Engineers solve problems by creating new products, structures, and systems. There are many branches, such as civil, mechanical, electrical, and software engineering, but they all share a common goal: making life better, safer, and more efficient.
工程是运用科学和数学来设计、建造和改善事物。工程师通过创造新产品、结构和系统来解决问题。工程有很多分支，如土木、机械、电气和软件工程，但它们都有一个共同目标：让生活更美好、更安全、更高效。
2. Safety in Engineering | 工程安全
Safety is the number one rule in any workshop or lab. You must always wear personal protective equipment (PPE) such as safety goggles, aprons, and sturdy shoes. Long hair should be tied back, and loose clothing must be secured. Before using any tool or machine, listen to your teacher’s instructions and never rush a job – accidents often happen when people cut corners.
在任何车间或实验室，安全是第一守则。你必须始终穿戴个人防护装备（PPE），如护目镜、围裙和结实的鞋子。长发应扎起，宽松衣物需固定好。使用任何工具或机器前，要仔细听老师的指导，切勿匆忙作业——事故常发生在偷工减料之时。
3. Tools and Equipment | 工具与设备
In Year 7, you will get hands-on with basic engineering tools. Common hand tools include hacksaws for cutting metal, files for smoothing edges, spanners and screwdrivers for assembly, and bench vices for holding work steady. You may also use measuring tools like rulers, tape measures, and callipers. Each tool has a specific job, and learning to use them correctly builds your practical skills.
七年级你将亲手使用基本工程工具。常见的手工具有锯切金属的钢锯、打磨边缘的锉刀、用于装配的扳手和螺丝刀，以及固定工件的台虎钳。你还会使用直尺、卷尺和卡尺等测量工具。每种工具都有特定用途，学会正确使用能锻炼你的实践能力。
4. Measuring and Marking Out | 测量与标记
Accuracy is crucial in engineering. Before cutting or shaping a material, you need to measure and mark it carefully. Use a steel rule for straight measurements and a try square to draw right angles. Marking out is done with a scriber on metal or a pencil on wood. Always measure twice and cut once – this saying reminds you to double-check before making permanent changes.
精确在工程中至关重要。切割或塑形材料前，需要仔细测量和标记。用钢尺进行直线测量，用直角尺画直角。在金属上用划线针标记，在木材上用铅笔标记。始终测量两次再切割一次——这句俗语提醒你在做出永久改变之前要仔细核对。
5. Materials and their Properties | 材料及其性质
Engineers choose materials based on their properties. The main groups you study are metals (e.g., mild steel, aluminium), plastics (e.g., acrylic, PVC), and woods (e.g., pine, MDF). Key properties include strength, hardness, toughness, flexibility, and conductivity. For example, aluminium is lightweight and resistant to corrosion, making it ideal for aircraft parts.
工程师根据材料的性质来选择材料。你学习的主要类别有金属（如软钢、铝）、塑料（如亚克力、PVC）和木材（如松木、中密度纤维板）。关键性质包括强度、硬度、韧性、柔韧性和导电性。例如，铝质轻且耐腐蚀，非常适用于飞机零件。
| Material 材料 | Key Property 关键性质 | Typical Use 典型用途 |
|---|---|---|
| Mild Steel 软钢 | High strength, magnetic 高强度，有磁性 | Car bodies, bolts 汽车车身，螺栓 |
| Aluminium 铝 | Lightweight, corrosion-resistant 轻质，耐腐蚀 | Drinks cans, aeroplane parts 饮料罐，飞机零件 |
| Acrylic 亚克力 | Transparent, brittle 透明，易碎 | Display signs, windows 展示牌，窗户 |
| Pine 松木 | Soft, easy to work 柔软，易加工 | Furniture, shelves 家具，搁板 |
6. Structures: Bridges and Towers | 结构：桥梁与塔
Structures must be strong and stable. You will learn about beam bridges, arch bridges, and truss bridges. A truss uses triangles to spread the load, making the structure rigid. Towers, like electricity pylons, are often built as lattice structures because triangles resist deforming. The concepts of tension (pulling force) and compression (pushing force) explain why some parts stretch while others squash.
结构必须坚固且稳定。你将学习梁桥、拱桥和桁架桥。桁架利用三角形分散荷载，使结构不易变形。像输电塔这类塔架常建成格构式结构，因为三角形能抵抗变形。张力（拉力）和压缩力（推力）的概念解释了为什么某些部件被拉伸，而另一些被压缩。
7. Simple Machines: Levers | 简单机械：杠杆
A lever is a simple machine that helps you multiply force. It consists of a rigid bar that pivots on a fulcrum. There are three classes of lever. In a first-class lever, the fulcrum is between the effort and the load, like a seesaw. A second-class lever has the load in the middle, for example, a wheelbarrow. Third-class levers have the effort in the middle, such as tweezers or a fishing rod.
杠杆是一种帮助你放大力量的简单机械。它由一根在支点上转动的刚性杆组成。杠杆分为三类。第一类杠杆的支点在施力点和负载之间，如跷跷板。第二类杠杆负载在中间，如手推车。第三类杠杆施力点在中间，如镊子或钓鱼竿。
Mechanical advantage = Load ÷ Effort
机械效益 = 负载 ÷ 施力
8. Gears and Drive Systems | 齿轮与传动系统
Gears are toothed wheels that transmit motion and force. When a small gear drives a larger gear, the speed decreases but the turning force (torque) increases – this is called gearing down. When a large gear drives a smaller one, speed increases and torque decreases – gearing up. Simple gear trains and chain drives can be found in bicycles, where pedalling power is transferred to the back wheel.
齿轮是用于传递运动和力的带齿轮子。小齿轮驱动大齿轮时，速度降低但转动力（扭矩）增大——这称为减速增扭；大齿轮驱动小齿轮时，速度增加，扭矩减小——升速减扭。简单的齿轮系和链传动可在自行车上找到，脚踏力通过链条传递到后轮。
9. Introduction to Electronic Circuits | 电子电路基础
An electronic circuit is a path through which electricity flows. You will learn about basic components: batteries (power source), wires (conductors), switches (control), resistors (limit current), and LEDs (light output). A series circuit has only one loop, so if one component fails, the whole circuit stops. In a parallel circuit, components are on separate branches, so each one works independently.
电子电路是电流流动的路径。你将学习基本元器件：电池（电源）、导线（导体）、开关（控制）、电阻（限流）和LED（发光输出）。串联电路只有一条回路，因此一个元件损坏整个电路就停止工作。并联电路中，元件位于不同分支，各自独立工作。
10. The Design Process | 设计过程
Engineering isn’t just about making – it starts with a design process. You follow steps: identify a problem, research, generate ideas, choose a solution, make a prototype, test and evaluate, then improve. Drawing skills are important, including crating (building up 3D sketches from simple boxes) and isometric drawing. A good design meets the specification and is within the budget and time limit.
工程不仅仅是制造——它从设计过程开始。你需要遵循这些步骤：识别问题、调研、生成方案、选择解决方案、制作原型、测试评估，然后改进。绘图技能很重要，包括立体素描法和等距绘图。一个好的设计要满足规格要求，并在预算和时间限制内完成。
11. Sustainable Engineering and Modern Technologies | 可持续工程与现代技术
Today’s engineers think carefully about the environment. Sustainable engineering means using materials and energy in ways that do not harm the planet. This includes recycling, reducing waste, and designing products that last longer. You might also explore new technologies like CAD (Computer-Aided Design) for creating digital models and 3D printing for rapid prototyping. Renewable energy sources such as wind turbines and solar panels open up exciting engineering challenges.
今天的工程师会认真考虑环境问题。可持续工程意味着以不伤害地球的方式使用材料和能源。这包括回收利用、减少浪费和设计更耐用的产品。你可能还会接触到计算机辅助设计（CAD）等新技术来创建数字模型，以及3D打印进行快速原型制作。风力涡轮机和太阳能电池板等可再生能源带来了令人兴奋的工程挑战。
Published by TutorHao | Engineering Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
屏轩国际教育cambridge primary/secondary checkpoint, cat4, ukiset,ukcat,igcse,alevel,PAT,STEP,MAT, ibdp,ap,ssat,sat,sat2课程辅导，国外大学本科硕士研究生博士课程论文辅导