Year 12 CCEA Engineering: Vocabulary Terminology Quick Memorization Guide | 词汇术语速记指南

📚 Year 12 CCEA Engineering: Vocabulary Terminology Quick Memorization Guide | 词汇术语速记指南

Mastering technical terminology is not just about passing the exam—it is the key to thinking like an engineer. In CCEA Year 12 Engineering, you are expected to explain design decisions, justify material choices, and analyse mechanical and electronic systems using precise language. This guide breaks down the essential vocabulary topic by topic and shows you how to lock those terms into long‑term memory with proven memorization strategies. Use it alongside your class notes and past‑paper questions to build confidence and fluency.

掌握技术术语不仅关乎通过考试，更是像工程师一样思考的关键。在CCEA Year 12工程课程中，你需要使用精确的语言来解释设计决策、论证材料选择以及分析机械和电子系统。本指南按主题分解必备词汇，并展示如何用经过验证的记忆策略将这些术语牢牢锁入长期记忆中。配合课堂笔记和历年真题使用，可助你建立自信、提升流畅度。

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1. Why Terminology Matters in CCEA Engineering | 为何术语如此重要

Examiners award marks for accurate use of engineering vocabulary. Writing ‘strong metal’ instead of ‘high tensile strength steel’ signals a lack of precision and can cost you valuable grades. Command words like identify, describe, explain and evaluate each demand different depths of answer, and using the correct terms shows you understand that hierarchy.

考官会根据你对工程词汇的准确使用来评分。把‘高强度抗拉钢’写成‘结实的金属’表明缺乏精确性，可能让你错失宝贵分数。诸如识别、描述、解释和评价等指令词要求不同层次的回答，使用正确的术语说明你理解这种层次差异。

Moreover, a solid technical vocabulary helps you decode the question paper swiftly. When you read ‘calculate the efficiency of the lever’, you instantly know you need the mechanical advantage and velocity ratio. Linking words to their definitions reduces cognitive load and leaves more time for design challenges.

此外，扎实的技术词汇量能帮助你快速解读试卷。当你读到‘计算杠杆的效率’时，你会立刻明白需要机械效益和速比。将词汇与其定义关联起来能减少认知负荷，为设计挑战留出更多时间。

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2. Materials and Their Properties | 材料及其性能

Ferrous metals contain iron and are typically magnetic and prone to rusting unless protected. Common examples include mild steel and cast iron.

黑色金属含铁，通常有磁性，除非加以保护否则容易生锈。常见例子包括低碳钢和铸铁。

Non‑ferrous metals do not contain iron. Aluminium, copper and brass are lighter and generally more corrosion‑resistant than ferrous metals, making them ideal for aerospace and electrical applications.

有色金属不含铁。铝、铜和黄铜比黑色金属更轻，通常更耐腐蚀，因而成为航空航天和电气应用的理想选择。

Alloy: a mixture of two or more elements, at least one of which is a metal, designed to enhance properties like strength or hardness. Steel is an alloy of iron and carbon.

合金：由两种或多种元素（其中至少一种为金属）混合而成，旨在提高强度或硬度等性能。钢是铁和碳的合金。

Toughness measures a material’s ability to absorb energy and deform plastically without fracturing. Impact testing, such as the Charpy test, quantifies toughness.

韧性衡量材料吸收能量并发生塑性变形而不断裂的能力。摆锤冲击试验等可量化韧性。

Elastic limit is the maximum stress a material can withstand and still return to its original dimensions once the load is removed. Beyond this, permanent deformation occurs.

弹性极限是材料在卸载后仍能恢复原始尺寸所能承受的最大应力。超过此值将发生永久变形。

Durability refers to a material’s ability to withstand wear, pressure or damage over time. It is a vital property for components exposed to repeated loads or weather.

耐久性指材料长时间抵抗磨损、压力或损坏的能力。对于承受反复载荷或暴露于室外的部件来说，这是一项至关重要的性能。

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3. Mechanical Systems Vocabulary | 机械系统词汇

Mechanical advantage (MA) is the ratio of the output force (load) to the input force (effort). MA = Load / Effort. A system with MA > 1 makes the task feel easier by multiplying effort.

机械效益 (MA) 是输出力（载荷）与输入力（施力）的比率。MA = 载荷 / 施力。MA > 1 的系统通过放大施力让工作感觉更轻松。

Velocity ratio (VR) is the ratio of the distance moved by the effort to the distance moved by the load in the same time. It depends solely on the geometry of the machine.

速比 (VR) 是在相同时间内施力点移动距离与载荷移动距离的比率。它仅取决于机器的几何结构。

Efficiency of a mechanical system is calculated as (MA / VR) × 100%. Energy losses arise from friction and heat, so real machines are never 100% efficient.

机械系统的效率计算公式为 (MA / VR) × 100%。能量损失源于摩擦和热量，因此真实机器的效率绝不会达到100%。

Lever: a rigid bar that pivots around a fulcrum. Classes of lever (first, second, third) determine whether the effort or load arm is longer, affecting MA.

杠杆：绕支点转动的刚性杆。杠杆的类别（第一、二、三类）决定施力臂还是载荷臂更长，从而影响MA。

Gear ratio expresses the relationship between a driven gear’s speed relative to the driver gear. A ratio greater than 1:1 increases torque but reduces speed.

齿轮比表示从动齿轮相对于主动齿轮的速度关系。比值大于1:1时将增大扭矩但降低速度。

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4. Electronic & Electrical Essentials | 电子与电气基础

Potential difference (voltage) is the energy transferred per unit charge between two points, measured in volts (V). It drives current through a circuit.

电位差（电压）是两点间单位电荷转移的能量，以伏特 (V) 为单位。它驱动电流通过电路。

Current (I) is the rate of flow of electric charge, measured in amperes (A). Conventional current flows from positive to negative.

电流 (I) 是电荷流动的速率，以安培 (A) 为单位。传统电流方向为正极到负极。

Resistance (R) opposes the flow of current, measured in ohms (Ω). Conductors have low resistance; insulators have very high resistance.

电阻 (R) 阻碍电流流动，以欧姆 (Ω) 为单位。导体的电阻低；绝缘体的电阻极高。

V = I × R

Ohm’s Law states that voltage equals current times resistance. It is the foundation of all DC circuit analysis.

欧姆定律指出电压等于电流乘以电阻。它是所有直流电路分析的基础。

Resistor: a passive component that limits current and produces a voltage drop. Its value is indicated by colour codes or printed digits.

电阻器：一种限制电流并产生电压降的无源元件。其阻值通过色码或印刷数字标示。

Diode: a semiconductor device that allows current to flow in only one direction. Commonly used in rectifier circuits to convert AC to DC.

二极管：只允许电流单向导通的半导体器件。常用于整流电路中将交流电转换为直流电。

Capacitor: stores electrical energy in an electric field. Its capacitance, measured in farads (F), determines how much charge it can hold.

电容器：在电场中储存电能。其电容量以法拉 (F) 为单位，决定它能容纳多少电荷。

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5. Manufacturing & Processing Terms | 制造与加工术语

Casting: a process in which molten metal is poured into a mould cavity and left to solidify. Sand casting uses expendable sand moulds, while die casting employs reusable metal moulds for high‑volume production.

铸造：将熔融金属浇注到模具型腔中并使其凝固的工艺。砂型铸造使用一次性砂模，而压力铸造则采用可重复使用的金属模具进行大批量生产。

Machining involves removing material using a cutting tool to achieve the desired shape and size. Common operations include turning, milling, drilling and grinding. CNC (Computer Numerical Control) machining automates these processes for high precision.

机械加工指使用刀具去除材料，以获得所需形状和尺寸。常见操作包括车削、铣削、钻削和磨削。CNC（计算机数控）加工使这些过程自动化，实现高精度。

Forming reshapes material without adding or removing it. Bending, forging, and rolling are typical forming methods. Hot forming improves ductility; cold forming increases strength through work hardening.

成形在不增添或去除材料的情况下重塑工件。弯曲、锻造和轧制是典型的成形方法。热成形提高延展性；冷成形通过加工硬化提高强度。

Additive manufacturing builds parts layer by layer from a digital model, commonly known as 3D printing. It reduces waste and allows complex geometries impossible with subtractive methods.

增材制造根据数字模型逐层构建零件，通常被称为3D打印。它减少浪费，并能实现减材法无法达成的复杂几何形状。

Injection moulding: molten thermoplastic is injected under pressure into a mould. It is widely used for high‑volume production of plastic components like phone cases and bottle caps.

注塑成型：将熔融热塑性塑料在压力下注入模具。广泛用于大批量生产塑料部件，如手机壳和瓶盖。

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6. Engineering Drawing & CAD Language | 工程图学与CAD语言

Orthographic projection represents a 3D object using multiple 2D views (front, top, side). Each view shows only two dimensions, enabling accurate dimensioning for manufacture.

正交投影用多幅二维视图（前视、俯视、侧视）来表现三维物体。每幅视图只显示两个维度，便于为制造提供精确尺寸标注。

Isometric drawing is a 3D pictorial representation where vertical lines stay vertical and horizontal lines are drawn at 30° to the horizontal. It keeps proportions constant but is not true perspective.

等角图是一种三维图形表示法，垂线保持垂直，水平线则与水平方向成30°角。它保持比例恒定，但非真实透视。

Dimensioning communicates exact sizes and locations on a drawing. Extension and dimension lines with arrowheads, along with numerical values, must follow British Standards (BS 8888).

尺寸标注在图纸上传达精确的尺寸和位置。带箭头的延伸线和尺寸线以及数值必须遵循英国标准 (BS 8888)。

Tolerance is the permissible variation from a specified dimension. A dimension of 25 ±0.2 mm means the part is acceptable if it measures between 24.8 mm and 25.2 mm. Tight tolerances increase manufacturing cost.

公差是相对给定尺寸的允许变化量。尺寸25 ±0.2 mm 意味着零件测量值在24.8 mm 至25.2 mm 之间视为合格。严格的公差会增加制造成本。

CAD (Computer‑Aided Design) uses software to create precise 2D and 3D models. CAD files can be directly linked to CAM for manufacturing.

CAD（计算机辅助设计）使用软件创建精确的二维和三维模型。CAD文件可直接连接CAM进行制造。

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7. Structures & Forces Vocabulary | 结构与力学词汇

Tension is a pulling force that tends to stretch a member. Cables and ties are designed to carry tension loads.

拉伸是一种趋于拉长构件的拉力。缆索和拉杆被设计用来承受拉伸载荷。

Compression is a pushing force that tends to shorten a member. Columns and struts must resist compressive forces without buckling.

压缩是一种趋于缩短构件的推力。柱和撑杆必须抵抗压缩力而不发生屈曲。

Shear acts parallel to a surface, causing layers to slide past each other. Rivets and bolts experience shear in many structural joints.

剪切平行作用于表面，导致各层相互滑移。铆钉和螺栓在许多结构节点中承受剪力。

Bending moment is the internal moment that causes a beam to curve. It is largest where shear force changes sign.

弯矩是导致梁弯曲的内力矩。在剪力改变符号位置处弯矩最大。

Truss: a framework of members, typically arranged in triangles, that carries loads mainly in tension or compression. Roof trusses and bridge supports are common examples.

桁架：一种由杆件构成的框架，通常呈三角形排列，主要以拉伸或压缩方式承载。屋架和桥梁支架是常见例子。

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8. Quality, Testing & Inspection | 质量、测试与检验

Quality control (QC) involves inspecting and testing a product at various stages to identify defects. It is reactive and often uses sampling techniques.

质量控制 (QC) 指在产品不同阶段进行检验和测试以识别缺陷。它是反应性的，通常采用抽样技术。

Quality assurance (QA) is a proactive system that sets procedures to prevent defects from occurring. It focuses on the process rather than just the final product.

质量保证 (QA) 是一种主动的系统，制定流程以预防缺陷产生。它关注过程而非仅仅最终产品。

Destructive testing pushes a sample to failure to understand its mechanical properties. Tensile tests and Charpy impact tests are destructive methods.

破坏性测试将试样加载至破坏以了解其机械性能。拉伸试验和摆锤冲击试验是破坏性方法。

Non‑destructive testing (NDT) checks for flaws without damaging the part. Visual inspection, dye penetrant, ultrasonic and X‑ray are common NDT techniques.

无损检测 (NDT) 检查缺陷而不损坏零件。目视检查、渗透探伤、超声波和X射线是常见的无损检测技术。

Micrometer: a precision instrument that measures thickness or diameter to an accuracy of 0.01 mm. Vernier calipers can measure inside, outside and depth dimensions.

千分尺：一种精密测量仪器，可测量厚度或直径，精度达0.01 mm。游标卡尺可测量内径、外径和深度尺寸。

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9. Health & Safety Must‑Know Terms | 健康与安全必备术语

Hazard is anything with the potential to cause harm, such as a rotating blade or a chemical substance. Risk is the likelihood of that harm occurring combined with the severity of the outcome.

危险源指任何可能造成伤害的事物，如旋转刀片或化学物质。风险则是该伤害发生的可能性与其后果严重程度的结合。

Risk assessment is a systematic process of identifying hazards, evaluating risks, and implementing control measures. The hierarchy of control ranks elimination as the most effective.

风险评估是识别危险源、评估风险并实施控制措施的系统化过程。控制层级将消除危险源列为最有效的措施。

PPE (Personal Protective Equipment) includes items like safety glasses, gloves, steel‑toe boots and ear defenders. PPE is the last line of defence when hazards cannot be fully eliminated.

PPE（个人防护装备）包括安全眼镜、手套、钢头靴和听力保护器等。当危险源无法完全消除时，PPE是最后一道防线。

COSHH (Control of Substances Hazardous to Health) regulations require employers to control exposure to hazardous substances. RIDDOR mandates reporting of certain workplace injuries and incidents.

COSHH（有害健康物质控制规例）要求雇主控制对有害物质的暴露。RIDDOR（伤害、疾病和危险事件报告条例）规定必须报告特定的工作场所伤害和事件。

Safety signs are colour‑coded: red prohibition (no entry), yellow warning (caution, trip hazard), blue mandatory (wear goggles) and green safe condition (emergency exit).

安全标志有颜色编码：红色禁止（禁止入内）、黄色警告（小心、绊倒危险）、蓝色强制（佩戴护目镜）和绿色安全状况（紧急出口）。

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10. Accelerated Memorization Strategies | 加速记忆策略

Active recall is more effective than passive re‑reading. Create flashcards with the term on one side and its definition plus a practical example on the other. Review them in short bursts each day.

主动回忆比被动重读更有效。制作闪卡，一面写上术语，另一面写定义加一个实际例子。每天用短时间复习。

Use mnemonics to link concepts. For example, remember the four main types of forces as ‘Tigers Sleep Carefully Below’ (Tension, Shear, Compression,

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