📚 Year 7 OCR Engineering: Core Knowledge Topics | 七年级 OCR 工程：核心知识点梳理
Engineering is all about designing, building, and improving the world around us. In Year 7, you will begin to explore the essential ideas that engineers use every day — from selecting materials and using tools safely to understanding basic mechanics, electronics, and structures. This article brings together the core knowledge topics you need to master, with each concept explained clearly in both English and Chinese to support your learning journey.
工程就是设计、建造和改进我们周围的世界。在七年级，你将开始探索工程师日常使用的核心理念——从选择材料和安全使用工具，到了解基础机械、电子和结构。本文汇集了你需要掌握的核心知识点，每个概念都配有清晰的中英双语解释，为你的学习之路提供支持。
1. What is Engineering? | 什么是工程？
Engineering is the creative application of science, mathematics and technology to design, build, test and maintain products, structures and systems that solve problems or meet human needs.
工程是科学、数学和技术的创造性应用，通过设计、建造、测试和维护产品、结构与系统，解决实际问题或满足人类需求。
Engineers work in many fields, such as mechanical, civil, electrical and software engineering. They follow a structured process to turn ideas into reality while considering cost, safety and environmental impact.
工程师在许多领域工作，如机械、土木、电气和软件工程。他们遵循系统化的流程将想法变为现实，同时考虑成本、安全和环境影响。
In Year 7 OCR Engineering, you will be introduced to the same design and make processes used by professionals, starting with simple projects that build practical skills and thinking habits.
在七年级 OCR 工程课中，你将接触专业人士使用的相同的设计与制作流程，从简单的项目开始，培养实践技能和思维习惯。
2. The Engineering Design Process | 工程设计过程
The engineering design process is a step-by-step method engineers use to create solutions. It usually includes stages: identify the problem, research, brainstorm ideas, develop a design, build a prototype, test and evaluate, and then improve the design.
工程设计过程是工程师用来创造解决方案的逐步方法。它通常包括以下阶段：识别问题、调查研究、头脑风暴、开发设计、制作原型、测试评估，然后改进设计。
In Year 7, you will follow a simplified cycle: Define – Design – Make – Evaluate. You will learn to write a design brief, produce sketches, select materials and tools, build a model and then reflect on what worked well and what could be better.
在七年级，你将遵循简化后的循环：定义 – 设计 – 制作 – 评价。你将学习撰写设计纲要、绘制草图、选择材料和工具、制作模型，然后反思哪些做得好、哪些可以改进。
Iteration is a key idea — engineers often go back and modify their designs based on test results. This is called the 'iterative design process'.
迭代是一个关键理念——工程师经常根据测试结果返回并修改设计。这被称为“迭代设计过程”。
3. Workshop Safety and Rules | 车间安全与规则
Safety is the most important rule in any engineering workshop. Before using any tool or machine, you must understand the hazards and always follow the safety instructions given by your teacher.
安全是任何工程车间中最重要的规则。在使用任何工具或机器之前，你必须了解其危险，并始终遵循老师给出的安全指导。
Common hazards include sharp edges, moving parts, hot surfaces, dust and fumes. Personal protective equipment (PPE) such as safety goggles, aprons and sometimes gloves must be worn correctly.
常见的危险包括锋利边缘、运动部件、高温表面、粉尘和烟雾。必须正确穿戴个人防护装备（PPE），例如安全护目镜、围裙，有时还需戴手套。
Keep your work area tidy, never run in the workshop, tie back long hair, remove loose jewellery and always wash your hands after practical activities. Report any accident, however small, to the teacher immediately.
保持工作区域整洁，不在车间奔跑，把长头发扎起来，摘下松散的饰品，并在实践活动后务必洗手。任何事故，无论多小，都要立即报告老师。
4. Materials and Their Properties | 材料及其性能
Engineers choose materials based on their properties. Common groups include woods (natural and manufactured), metals (ferrous and non-ferrous), plastics (thermoplastics and thermosets) and composites.
工程师根据材料性能来选择材料。常见类别包括木材（天然和人造）、金属（黑色金属和有色金属）、塑料（热塑性和热固性）以及复合材料。
Key properties you need to know are: hardness, strength (tensile, compressive), toughness, flexibility, conductivity (thermal and electrical) and density. For example, copper is chosen for electrical wires because it is a good electrical conductor.
你需要了解的关键性能有：硬度、强度（抗拉、抗压）、韧性、柔韧性、导热与导电性以及密度。例如，铜被选作电线材料是因为它具有优良的导电性。
In Year 7 projects, you might work with softwood, MDF, acrylic, card and aluminium foil. You will learn to compare how they feel, cut, bend and join, linking each material to its real-world uses.
在七年级的项目中，你可能会用到软木、中密度纤维板、亚克力、卡纸和铝箔。你将学习比较它们的手感、切割、弯曲和连接方式，并将每种材料与其实际用途联系起来。
5. Common Tools and Machines | 常用工具与机器
A range of hand tools and machines are introduced in Year 7 under close supervision. Hand tools include steel rules, try squares, saws (tenon saw, coping saw), files, hammers and screwdrivers.
在七年级，你会在密切监督下接触一系列手工工具和机器。手工工具包括钢直尺、直角尺、锯（夹背锯、线锯）、锉刀、锤子和螺丝刀。
Machines you may use are the pillar drill (for making holes), a disc sander (for smoothing edges) and possibly a vacuum former to shape plastic sheets. Always follow the 'one person at a time' rule and use guards correctly.
你可能使用的机器包括台钻（用于钻孔）、盘式砂光机（用于打磨边缘），可能还有真空成型机来塑造塑料片材。始终遵守“一次一人”原则，并正确使用防护装置。
Measuring and marking tools are just as important — a try square checks 90° angles, a marking gauge scribes parallel lines, and a centre punch makes a dent to guide a drill bit.
测量和划线工具同样重要——直角尺用于检查 90° 角，划线规用于划出平行线，中心冲用于冲出一个凹痕以引导钻头。
6. Simple Machines – Levers | 简单机械 – 杠杆
A lever is a simple machine that makes work easier by allowing a small effort to move a larger load. It consists of a rigid bar that pivots around a fixed point called the fulcrum.
杠杆是一种简单机械，它通过让较小的作用力移动较大负载来让工作变轻松。它由一根刚性杆组成，可绕一个称为支点的固定点转动。
crum = Effort × distance from effort to fulcrum. Mathematically, this is often written as:
力矩原理说明，对于平衡的杠杆：负载 × 负载到支点的距离 = 作用力 × 作用力到支点的距离。用数学式常表示为：
Load × dL = Effort × dE
There are three types of levers depending on the position of the load, effort and fulcrum. In Year 7, scissors, tongs and wheelbarrows are common examples to analyse.
根据负载、作用力和支点的位置不同，杠杆分为三类。在七年级，剪刀、钳子和手推车是常见的分析例子。
7. Basic Electronics | 基础电子学
Electricity is the flow of charged particles, usually electrons, through a conductive path. A simple circuit must include a power source (such as a battery), a load (like a bulb or LED) and connecting wires.
电是带电粒子（通常是电子）在导电通路中的流动。一个简单的电路必须包括电源（如电池）、负载（如灯泡或 LED）和连接导线。
Voltage (V), measured in volts, is the ‘push’ that drives the current. Current (I), measured in amperes (amps), is the rate of flow of charge. Resistance (R), measured in ohms (Ω), restricts the current.
电压 (V) 以伏特为单位，是驱动电流的“推力”。电流 (I) 以安培为单位，是电荷流动的速率。电阻 (R) 以欧姆 (Ω) 为单位，限制电流的大小。
Ohm’s Law links these three quantities: V = I × R. In Year 7, you will build series circuits, learn to identify short circuits, and perhaps use a multimeter to measure voltage across components.
欧姆定律将这三个量联系起来：V = I × R。在七年级，你将搭建串联电路，学习识别短路，并可能使用万用表测量元件两端的电压。
8. Structures and Forces | 结构与力
Structures are arrangements of parts designed to support loads. Bridges, towers, chairs and even smartphone cases are all structures that must resist forces without breaking or deforming too much.
结构是为承受载荷而设计的部件组合。桥梁、塔架、椅子甚至手机壳都是结构，它们必须在不发生断裂或过大变形的情况下承受力的作用。
The main forces you learn about are: tension (pulling), compression (pushing), bending, torsion (twisting) and shear (sliding). Structural members like beams, columns and struts are used to handle these forces.
你将要学习的主要力有：拉力（拉伸）、压力（压缩）、弯曲力、扭力（扭转）和剪切力（滑移）。梁、柱和压杆等结构构件用于应对这些力。
Triangles are very strong and often appear in truss bridges and cranes because they distribute forces evenly and resist deformation. You will test paper or spaghetti structures to see which shapes are stiffest.
三角形非常坚固，常出现在桁架桥和起重机中，因为它们均匀分散力并抵抗变形。你将测试纸制或意大利面条结构，看看哪些形状最不易弯曲。
9. Measuring and Marking Out | 测量与划线
Accurate measuring and marking out are essential skills that determine the quality of a finished product. You must be able to read a steel rule in millimetres (mm) and centimetres (cm), using the zero end correctly.
精确测量与划线是决定成品质量的基本技能。你必须能够以毫米 (mm) 和厘米 (cm) 为单位读取钢直尺，并正确使用零点端。
A try square ensures edges are square (at 90°), while a marking gauge or odd-leg calliper scribes a line parallel to an edge. An engineer's square is used for more precise work on metal.
直角尺确保边缘垂直（呈 90°），而划线规或单脚卡钳可划出一条与边缘平行的线。在金属件上做更精确的工作时，会使用工程师角尺。
When drilling, a centre punch makes a small dent to stop the drill bit from wandering. Always mark out on the waste side of the line; the line itself should be kept and the cut made just next to it.
钻孔时，中心冲冲出一个小凹痕以防止钻头滑动。始终在线的废料侧划线；线本身应保留，切割紧贴线旁进行。
10. Sustainability in Engineering | 工程中的可持续发展
Sustainability means using resources in a way that meets our present needs without compromising the ability of future generations to meet their own needs. Engineers play a vital role in designing environmentally friendly products.
可持续发展是指以一种既能满足我们当前需求、又不损害子孙后代满足其自身需求的能力的方式来使用资源。工程师在设计中发挥关键作用，创造环保产品。
The 6Rs – Reduce, Reuse, Recycle, Repair, Rethink and Refuse – provide a framework for making better material choices. For example, designing a product that uses fewer parts reduces material waste.
六项原则——减量、再利用、再循环、修复、重新思考与拒绝——为做出更好的材料选择提供了框架。例如，设计一种使用更少部件的产品可减少材料浪费。
Life cycle assessment (LCA) considers the environmental impact of a product from raw material extraction through manufacturing, use and disposal. Even at Year 7 level, you should consider how your project could be made more sustainable.
生命周期评估 (LCA) 考虑产品从原材料提取、制造、使用到处置的全过程对环境的影响。即使在七年级，你也要考虑如何让自己的项目更具可持续性。
11. Communication Skills and Technical Drawing | 沟通技能与技术绘图
Engineers must communicate their ideas clearly. This involves freehand sketching, annotated drawings, and eventually using orthographic and isometric projections to show 3D objects on paper.
工程师必须清晰地传达自己的想法。这包括徒手草图、带注释的绘图，以及最终使用正投影和等距投影在纸上展示三维物体。
In Year 7, you start by learning how to label parts, add dimensions in millimetres, and use simple drawing conventions like dashed lines for hidden edges. Clear drawings help others understand your design intent.
在七年级，你首先学习如何标注零部件、添加以毫米为单位的尺寸，并使用简单的绘图惯例，如用虚线表示隐藏边缘。清晰的图纸有助于他人理解你的设计意图。
Teamwork and verbal communication are also assessed. You will often work in pairs or small groups, sharing ideas, dividing tasks and giving constructive feedback during the evaluate stage.
团队合作和口头沟通也是评估的一部分。你经常需要两人一组或小组合作，在评估阶段分享想法、分工任务并给予建设性反馈。
Keeping a design folio or logbook where you record research, sketches, test results and reflections is a habit that professional engineers value — and it helps you track your progress.
养成记录设计档案或日志的习惯，记录研究、草图、测试结果和反思，这是专业工程师重视的习惯，也有助于你追踪自己的进展。
Published by TutorHao | Engineering Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
或截图后用「扫一扫 → 相册」选择本图