📚 Year 11 CCEA Engineering: Key Terms & Memory Guide | CCEA 工程词汇术语速记指南
Mastering engineering terminology is like learning a new language—it unlocks your ability to understand exam questions, interpret diagrams, and communicate design ideas effectively. In Year 11 CCEA Engineering, you’ll encounter a wide range of technical terms, from material properties to electronic components. This memory guide breaks down the key vocabulary by topic and adds clever mnemonics and visual cues to help you recall them quickly. Whether you’re revising for a test or tackling coursework, these bite-sized explanations with bilingual support will strengthen your foundation. Let’s turn confusing jargon into simple, memorable concepts.
掌握工程术语就像学习一门新语言——它能让你理解考题、解读图表并有效传达设计思路。在 Year 11 CCEA 工程课程中，你将遇到从材料性能到电子元件的各种专业术语。本速记指南按主题梳理核心词汇，并添加巧妙的记忆联想法和视觉线索，帮助你快速回忆。无论你是在备考还是完成课程作业，这些中英双语的简明解释都将强化你的基础。让我们把晦涩的术语变成简单好记的概念。
1. Material Types & Properties | 材料类型与特性
Ferrous metals contain iron and are typically magnetic; examples include mild steel, cast iron and stainless steel. (Memory tip: ‘Ferrous’ comes from the Latin word for iron, ferrum.)
黑色金属含铁，通常具有磁性；例子包括低碳钢、铸铁和不锈钢。（记忆技巧：’Ferrous’ 源自拉丁语铁 ferrum。）
Non-ferrous metals do not contain iron; they are generally non-magnetic and more corrosion-resistant. Common ones are aluminium, copper, zinc, lead and tin. Think ‘Non’ = not, ‘ferrous’ = iron.
有色金属不含铁，一般无磁性且更耐腐蚀。常见的有铝、铜、锌、铅和锡。记法：’Non’ 没有，’ferrous’ 铁。
Alloys are mixtures of two or more elements, at least one being a metal, designed to improve properties like strength or corrosion resistance. Steel is an alloy of iron and carbon.
合金是两种或多种元素的混合物，其中至少一种为金属，旨在改善强度或耐腐蚀性。钢是铁和碳的合金。
Thermoplastics soften when heated and harden when cooled, allowing reshaping many times. Acrylic, polythene and nylon are examples. ‘Thermo’ = heat, ‘plastic’ = moldable.
热塑性塑料加热时变软，冷却时变硬，可多次重塑。如亚克力、聚乙烯和尼龙。’Thermo’ 热，’plastic’ 可塑。
Thermosets undergo a chemical change when heated and set permanently; they cannot be remelted. Epoxy resin and melamine are thermosets. (Imagine baking a cake—once set, you can’t unbake it.)
热固性塑料加热时发生化学变化并永久定型，不可重新熔化。环氧树脂和三聚氰胺属于热固性塑料。（就像烘烤蛋糕，一旦定型就无法还原。）
Composites combine two or more distinct materials to get enhanced properties, such as carbon fibre reinforced polymer (CFRP) which is strong yet light.
复合材料将两种或多种不同材料结合以获得更佳性能，如碳纤维增强聚合物（CFRP），既坚固又轻质。
2. Mechanical Properties Deep Dive | 深入力学性能
Stress (σ) is the force applied per unit area, measured in pascals (Pa) or N/m². Formula: Stress = Force / Area. Think ‘push spread over a surface’.
应力 (σ)是单位面积上所受的力，单位为帕斯卡 (Pa) 或 N/m²。公式：应力 = 力 / 面积。想象“推力分散在一个面上”。
Strain (ε) is the deformation (extension or compression) divided by the original length. It has no units because it’s a ratio. Strain = Change in length / Original length.
应变 (ε)是形变（伸长或压缩）除以原始长度。因为是一个比值，所以没有单位。应变 = 长度变化量 / 原始长度。
Young’s modulus (E) measures stiffness of a material: E = Stress / Strain, within the elastic limit. A high E value means the material resists stretching. Steel has a high E; rubber has a low E.
杨氏模量 (E)衡量材料的刚度：E = 应力 / 应变，在弹性极限内。E 值高表示材料抗拉伸能力强。钢的 E 值高，橡胶的 E 值低。
Ultimate tensile strength (UTS) is the maximum stress a material can withstand while being pulled before breaking. It’s the peak of the stress-strain curve.
极限抗拉强度 (UTS)是材料在拉伸断裂前所能承受的最大应力。这是应力-应变曲线的最高点。
Ductility describes how easily a material can be stretched into a wire. Copper is highly ductile. ‘Ductile’ sounds like ‘duct tape’ stretching.
延展性描述材料被拉伸成丝的能力。铜的延展性很好。’Ductile’ 听起来像拉伸的胶带。
Hardness is resistance to indentation, scratching or wear. Diamond is very hard; chalk is soft. (Hardness test: if a file bites, it’s less hard.)
硬度是抵抗压入、刮擦或磨损的能力。金刚石非常硬，粉笔则软。（硬度测试：如果锉刀能咬进去，硬度就较低。）
Toughness is a material’s ability to absorb energy and plastically deform without fracturing. Tough materials are not brittle.
韧性是材料吸收能量并发生塑性变形而不断裂的能力。韧性材料不易脆断。
3. Manufacturing Processes | 制造工艺
Casting involves pouring molten material into a mold where it solidifies. Used for engine blocks and complex shapes. Key terms: pattern, mold, runner, riser.
铸造将熔融材料浇入模具中凝固成型。用于发动机缸体等复杂形状。关键术语：模型、模具、浇道、冒口。
Forging shapes metal by compressive forces, often hot, to refine grain structure and increase strength. Think blacksmith hammering hot iron.
锻造通过压力（通常加热）使金属成型，细化晶粒并提高强度。想象铁匠锤打热铁。
Welding joins materials, usually metals, by melting the workpieces and adding a filler to form a strong pool. Common types: MIG, TIG, arc welding.
焊接通过熔化母材并添加填充材料形成牢固熔池来连接材料，常用于金属。常见类型：MIG 焊、TIG 焊、电弧焊。
Machining removes material using cutting tools. Turning (workpiece rotates), milling (cutter rotates), and drilling are subtractive processes.
机械加工通过切削刀具去除材料。车削（工件旋转）、铣削（刀具旋转）和钻削都属于减材制造。
Injection moulding forces molten plastic into a mold cavity under high pressure. Ideal for mass-producing identical plastic parts, such as bottle caps.
注塑成型在高压下将熔融塑料注入模腔。非常适合大批量生产相同塑料件，如瓶盖。
Additive manufacturing (3D printing) builds objects layer by layer from a digital model. It minimises waste and allows complex geometries.
增材制造（3D 打印）根据数字模型逐层构建物体。浪费少，可实现复杂几何形状。
4. Engineering Drawings & CAD | 工程图与 CAD
Orthographic projection shows a 3D object through multiple 2D views (front, side, plan) aligned accurately. Often uses first or third angle projection.
正交投影通过精准对齐的多个二维视图（主视图、侧视图、俯视图）来展示三维物体。常采用第一角或第三角投影法。
Isometric drawing presents a 3D view on a 2D plane with axes at 30° to the horizontal. Circles appear as ellipses. (Think ‘iso’ = equal, ‘metric’ = measure—equal measure on axes.)
等轴测图在二维平面上展示三维视图，轴线与水平线成 30°。圆形表现为椭圆。(‘iso’ 相等，’metric’ 测量——轴上尺寸等比。)
Dimensioning is the addition of measurements to a drawing; lines, arrows and numbers must follow British Standards (BS 8888). Always place dimensions logically.
尺寸标注是在图纸上添加测量值；线条、箭头和数字需遵循英国标准（BS 8888）。标注应条理清晰。
Tolerance specifies the permissible limit of variation in a physical dimension. Example: 50 mm ±0.1 mm means the size can be between 49.9 mm and 50.1 mm.
公差规定了物理尺寸允许的变动范围。例如：50 mm ±0.1 mm 表示尺寸可在 49.9 mm 至 50.1 mm 之间。
CAD (Computer-Aided Design) uses software to create precise 2D or 3D models. Linked with CAM (Computer-Aided Manufacturing) to generate CNC toolpaths.
CAD（计算机辅助设计）利用软件创建精确的二维或三维模型。与CAM（计算机辅助制造）结合可生成数控加工路径。
5. Forces, Motion & Mechanics | 力、运动与力学
Lever classes: Class 1 (fulcrum between load and effort, like a seesaw), Class 2 (load between fulcrum and effort, like a wheelbarrow), Class 3 (effort between fulcrum and load, like tweezers). Remember ‘FLE’—1-2-3 order.
杠杆类别：第一类（支点在载荷与发力点之间，如跷跷板），第二类（载荷在支点与发力点之间，如手推车），第三类（发力点在支点与载荷之间，如镊子）。记住顺序 ‘FLE’——1-2-3。
Mechanical advantage (MA) is how much a machine multiplies the effort force: MA = Load / Effort. For levers, MA = distance from effort to fulcrum / distance from load to fulcrum.
机械效益 (MA)表示机械放大力的大小：MA = 载荷 / 作用力。对杠杆而言，MA = 发力臂长度 / 载荷臂长度。
Velocity ratio (VR) is the ratio of distance moved by effort to distance moved by load: VR = Effort distance / Load distance. In an ideal machine, VR = MA.
速度比 (VR)是作用力移动距离与载荷移动距离之比：VR = 作用力距离 / 载荷距离。在理想机械中，VR = MA。
Efficiency (η) compares useful work output to total energy input: η = (MA / VR) × 100%. Friction always makes efficiency less than 100%.
效率 (η)对比有用输出功与总输入能量：η = (MA / VR) × 100%。摩擦总会使效率低于 100%。
Gears transmit rotary motion; a driver gear meshes with a driven gear. Gear ratio = number of teeth on driven / number of teeth on driver. A small gear driving a large gear increases torque.
齿轮传递旋转运动；主动轮与从动轮啮合。齿轮比 = 从动轮齿数 / 主动轮齿数。小齿轮驱动大齿轮会增大扭矩。
6. Electronic Components & Circuits | 电子元器件与电路
Resistor limits current flow; its resistance is measured in ohms (Ω). Colour bands indicate resistance value. Memo: ‘resistor restricts current’.
电阻器限制电流流动；阻值单位为欧姆 (Ω)。色环标示阻值。记法：’resistor’ 抵制电流。
Capacitor stores electrical charge temporarily; measured in farads (F). Used for smoothing circuits and timing. (Think of a tiny rechargeable bucket.)
电容器暂时储存电荷；单位为法拉 (F)。用于滤波和定时电路。（想象一个可充电的小桶。）
Diode allows current to flow in one direction only (forward bias). LED (light-emitting diode) gives out light. Symbol: arrow pointing against a bar.
二极管只允许电流单向流动（正向偏置）。发光二极管（LED）会发光。符号：箭头指向一横杠。
Transistor acts as a switch or amplifier. A small base current controls a larger collector-emitter current. NPN and PNP are common types.
晶体管用作开关或放大器。微小的基极电流控制较大的集电极-发射极电流。常见类型有 NPN 和 PNP。
Potential divider uses two resistors in series to produce a fraction of the input voltage. Vout = Vin × (R2 / (R1 + R2)). Often used with sensors.
分压器使用两个串联电阻产生输入电压的一部分。Vout = Vin × (R2 / (R1 + R2))。常与传感器配合使用。
Integrated circuit (IC) is a tiny chip containing many components. Microcontrollers, like the Arduino or PIC, are programmable ICs.
集成电路 (IC)是包含众多元件的微小芯片。如 Arduino 或 PIC 等微控制器都属于可编程 IC。
7. Systems & Control | 系统与控制
Input-Process-Output (IPO) model describes any system: input (sensor, switch), process (controller, logic), output (actuator, display).
输入-处理-输出 (IPO)模型描述任何系统：输入（传感器、开关）、处理（控制器、逻辑）、输出（执行器、显示器）。
Open-loop system has no feedback; it does not self-correct. Example: a simple timer that turns a light on for 5 minutes regardless of brightness.
开环系统没有反馈，无法自动纠偏。例如：一个简单的定时器，无论亮度如何都会使灯亮 5 分钟。
Closed-loop system uses feedback to compare actual output with desired input and adjusts automatically. A thermostat in a room heater is a closed-loop control.
闭环系统利用反馈将实际输出与期望输入比较并自动调整。房间暖气中的恒温器就是闭环控制。
Sensor detects physical changes (light, heat, pressure). LDR (light-dependent resistor) changes resistance with light level; thermistor changes with temperature.
传感器检测物理变化（光、热、压力）。光敏电阻（LDR）电阻随光照变化；热敏电阻随温度变化。
Actuator converts an electrical signal into physical action: motor, solenoid, buzzer, relay.
执行器将电信号转换为物理动作：电机、螺线管、蜂鸣器、继电器。
8. Pneumatic & Hydraulic Systems | 气动与液压系统
Pneumatics uses compressed air to transmit and control power. Air is clean, safe and readily available but compressible. Common in factory automation.
气动系统利用压缩空气传输和控制动力。空气清洁、安全、易获取，但具有可压缩性。常用于工厂自动化。
Hydraulics uses liquids (oil) to transmit force. Liquids are incompressible, so they provide precise movement and high force. Pascal’s principle applies: pressure = force / area.
液压系统利用液体（液压油）传递力。液体几乎不可压缩，因此能提供精确运动和大力矩。帕斯卡原理适用：压力 = 力 / 面积。
Cylinder converts pressure into linear motion. Single-acting cylinders use spring return; double-acting cylinders use air/liquid on both sides for extend and retract.
气缸/液压缸将压力转换为直线运动。单作用缸靠弹簧复位；双作用缸两侧受介质作用实现伸缩。
Valves control direction, flow and pressure. A 3/2 valve has 3 ports and 2 positions, often used to start/stop a cylinder.
阀门控制方向、流量和压力。3/2 阀有 3 个接口和 2 个位置，常用于启停气缸。
Pressure (P) is force acting on an area, measured in pascals (Pa) or bar. Formula: P = F / A. In hydraulics, a small force on a small piston can lift a large load by using a larger area piston.
压力 (P)是作用在面积上的力，单位帕斯卡 (Pa) 或巴。公式：P = F / A。在液压中，小活塞上的小力可通过大活塞面积抬起大负载。
9. Health & Safety in Engineering | 工程健康与安全
PPE (Personal Protective Equipment) includes safety glasses, ear defenders, steel-toe boots, gloves and overalls. Always match the PPE to the hazard.
PPE（个人防护装备）包括安全眼镜、护耳器、钢头鞋、手套和工作服。务必根据危险选用合适的 PPE。
COSHH (Control of Substances Hazardous to Health) regulations require risk assessment for chemicals, dust and fumes. Always read the safety data sheet (SDS).
COSHH（有害健康物质控制）法规要求对化学品、粉尘和烟雾进行风险评估。务必阅读安全数据表 (SDS)。
Risk assessment
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