A-Level CCEA Engineering: Quick Vocabulary & Terminology Guide | A-Level CCEA 工程：词汇术语速记指南

📚 A-Level CCEA Engineering: Quick Vocabulary & Terminology Guide | A-Level CCEA 工程：词汇术语速记指南

Mastering engineering vocabulary is the foundation for excelling in CCEA A-Level Engineering. This guide pairs key terms with clear definitions and memorable mnemonics, helping you recall essential concepts across materials, mechanics, electronics, manufacturing, design, project management, systems and sustainability. The bilingual format reinforces understanding and retention.

掌握工程词汇是在 CCEA A-Level 工程中取得优异成绩的基础。本指南将关键术语与清晰的定义和易记的助记符配对，帮助你回忆材料、机械、电子、制造、设计、项目管理、系统和可持续性等核心概念。双语形式强化理解和记忆。

1. Core Materials and Properties | 核心材料与性能

Density (ρ) – Mass per unit volume (kg/m³). High-density materials increase weight but often improve strength and stiffness.

密度 (ρ) – 单位体积的质量（kg/m³）。高密度材料增加重量，但通常提高强度和刚度。

Young’s Modulus (E) – A measure of stiffness: E = σ / ε, where σ is stress and ε is strain. The gradient of the stress-strain curve in the elastic region. Mnemonic: “E links stress and strain directly.”

杨氏模量 (E) – 刚度的度量：E = σ / ε，其中 σ 为应力，ε 为应变。它是应力-应变曲线弹性区域的斜率。助记：E 直接联系应力和应变。

Tensile Strength (UTS) – The maximum stress a material can withstand while being pulled before necking. Ultimate Tensile Strength (UTS) is the peak on the engineering stress-strain curve.

抗拉强度 (UTS) – 材料在被拉断前所能承受的最大应力。极限抗拉强度 (UTS) 是工程应力-应变曲线上的峰值。

Yield Strength – The stress at which a material begins to deform plastically. Think “yield = permanent deformation starts.”

屈服强度 – 材料开始发生塑性变形的应力。牢记”屈服 = 永久变形开始”。

Ductility – Ability to be drawn into a wire. Measured by percentage elongation or reduction in area. Mnemonic: “Ductile = Drawn.”

延展性 – 被拉成细丝的能力。通过延伸率或断面收缩率测量。助记：Ductile（延性）对应拉丝（Drawn）。

Malleability – Ability to be hammered or rolled into sheets without cracking. Mnemonic: “Malleable = Moulded or Mashed into sheets.”

可锻性 – 被锤击或碾压成薄片而不开裂的能力。助记：Malleable（可锻）对应模压成片（Moulded）。

Toughness – Energy absorbed before fracture; area under the stress-strain curve. Tough materials resist impact.

韧性 – 断裂前吸收的能量；应力-应变曲线下的面积。韧性材料抵抗冲击。

Hardness – Resistance to indentation or scratching. Common scales: Brinell, Rockwell, Vickers. Hard materials resist wear.

硬度 – 抵抗压痕或刮擦的能力。常用标度：布氏、洛氏、维氏。硬质材料耐磨损。

Fatigue – Failure under cyclic loading below the yield stress. S-N curve (Wöhler curve) shows stress vs. cycles to failure. Mnemonic: “Fatigue Fractures are From Fluctuating Forces.”

疲劳 – 在低于屈服应力的循环载荷下发生的破坏。S-N 曲线（沃勒曲线）展示了应力与破坏循环次数的关系。助记：疲劳断裂源于波动力。

Creep – Time-dependent permanent deformation under constant load, especially at high temperatures.

蠕变 – 恒定载荷下随时间增加的永久变形，尤其在高温下。

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2. Mechanical Principles | 机械原理

Force (F) – A push or pull, measured in newtons (N). F = m × a (Newton’s second law).

力 (F) – 推或拉，以牛顿 (N) 为单位。F = m × a（牛顿第二定律）。

Moment (M) – Turning effect: M = F × d, where d is the perpendicular distance from the pivot. Unit: N m.

力矩 (M) – 转动效应：M = F × d，d 为到支点的垂直距离。单位：N m。

Torque (T) – A moment that causes twisting, commonly used for shafts. T = F × r (radius).

扭矩 (T) – 引起扭转的力矩，常用于轴。T = F × r（半径）。

Equilibrium – A state where net force = 0 and net moment = 0. Apply free-body diagrams to solve.

平衡 – 合外力为零且合力矩为零的状态。使用受力分析图求解。

Mechanical Advantage (MA) – Ratio of load to effort. MA = Load / Effort. An ideal machine has MA = VR.

机械效益 (MA) – 负载与施力的比值。MA = 负载 / 施力。理想机械中 MA = VR。

Velocity Ratio (VR) – Ratio of distance moved by effort to distance moved by load. VR = d_effort / d_load.

速比 (VR) – 施力移动距离与负载移动距离之比。VR = d_effort / d_load。

Efficiency (η) – η = (MA / VR) × 100%. It measures energy conversion; always <100% due to friction.

效率 (η) – η = (MA / VR) × 100%。衡量能量转换效率；因摩擦总是低于100%。

Stress (σ) – Internal force per unit area: σ = F / A (N/m² or Pa). Normal stress acts perpendicular to the area.

应力 (σ) – 单位面积上的内力：σ = F / A（N/m² 或 Pa）。正应力垂直于面积作用。

Strain (ε) – Deformation per unit length: ε = ΔL / L₀ (dimensionless). Tensile strain is positive.

应变 (ε) – 单位长度的变形量：ε = ΔL / L₀（无量纲）。拉伸应变为正。

Hooke’s Law – σ = E × ε, valid only in the linear elastic region. E is Young’s modulus.

胡克定律 – σ = E × ε，仅在线弹性区域成立。E 为杨氏模量。

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3. Electronic and Electrical Concepts | 电子电气概念

Current (I) – Flow of charge: I = Q / t. Unit: ampere (A). Conventional current flows from positive to negative.

电流 (I) – 电荷的流动：I = Q / t。单位：安培 (A)。惯例电流从正流向负。

Voltage (V) – Electrical potential difference between two points; the ‘push’ that drives current. Unit: volt (V).

电压 (V) – 两点间的电位差；驱动电流的推动力。单位：伏特 (V)。

Resistance (R) – Opposition to current flow: R = V / I (Ohm’s law). Unit: ohm (Ω).

电阻 (R) – 对电流的阻碍作用：R = V / I（欧姆定律）。单位：欧姆 (Ω)。

Ohm’s Law – V = I × R. Mnemonic: “Violet Is Red” or “Very Important Rule”.

欧姆定律 – V = I × R。助记：Violet Is Red 或 Very Important Rule。

Power (P) – Rate of energy transfer: P = V × I = I²R = V²/R. Unit: watt (W).

功率 (P) – 能量转移速率：P = V × I = I²R = V²/R。单位：瓦特 (W)。

Kirchhoff’s Current Law (KCL) – Sum of currents entering a junction = sum of currents leaving. Based on charge conservation.

基尔霍夫电流定律 (KCL) – 流入节点的电流之和等于流出电流之和。基于电荷守恒。

Kirchhoff’s Voltage Law (KVL) – Sum of voltages around any closed loop = 0. Energy gained equals energy lost.

基尔霍夫电压定律 (KVL) – 任一闭合回路中电压的代数和为零。能量获得等于能量消耗。

Capacitance (C) – Ability to store charge: C = Q / V. Unit: farad (F). Time constant τ = RC.

电容 (C) – 储存电荷的能力：C = Q / V。单位：法拉 (F)。时间常数 τ = RC。

Logic Gates – AND, OR, NOT, NAND, NOR, XOR. Memorise truth tables. NAND and NOR are universal gates.

逻辑门 – 与门、或门、非门、与非门、或非门、异或门。熟记真值表。与非门和或非门是全能门。

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4. Manufacturing Processes | 制造工艺

Casting – Pouring molten metal into a mould and allowing it to solidify. Sand casting uses expendable moulds; die casting uses reusable metal moulds.

铸造 – 将熔融金属浇入模腔并使其凝固。砂型铸造使用一次性模具；压铸使用可重复使用的金属模具。

Forging – Shaping metal using compressive forces, often at elevated temperatures. Improves grain structure and strength.

锻造 – 通过压应力使金属成形，通常在高温下进行。改善晶粒结构并提高强度。

Welding – Joining materials by fusion with or without filler metal. MIG (Metal Inert Gas) and TIG (Tungsten Inert Gas) are common.

焊接 – 通过熔融连接材料，可使用或不使用填充金属。常见的有 MIG（熔化极惰性气体保护焊）和 TIG（钨极惰性气体保护焊）。

Brazing and Soldering – Brazing uses filler metal above 450°C; soldering below 450°C. Base metals do not melt. Used in electronics and plumbing.

钎焊与软钎焊 – 钎焊使用熔点高于 450°C 的填充金属；软钎焊低于 450°C。母材不熔化。用于电子和管道。

Machining – Removing material using cutting tools. Turning (lathe), milling, drilling, grinding. CNC (Computer Numerical Control) automates these.

机械加工 – 使用切削刀具去除材料。包括车削、铣削、钻孔、磨削。CNC（计算机数控）实现自动化。

Additive Manufacturing (3D Printing) – Building parts layer by layer from a digital model. Reduces waste and enables complex geometries.

增材制造（3D打印） – 根据数字模型逐层构建零件。减少浪费并能实现复杂几何形状。

Injection Moulding – Molten polymer injected into a mould under high pressure. Ideal for high-volume plastic parts. Cycle: clamp, inject, cool, eject.

注塑成型 – 熔融聚合物在高压下注入模具。适用于大批量塑料件。循环：合模、注射、冷却、顶出。

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5. Engineering Design and Communication | 工程设计与沟通

Orthographic Projection – 2D views (front, top, side) of a 3D object using parallel projection. Follows BSI conventions (e.g., BS 8888).

正交投影 – 使用平行投影将三维物体展示为二维视图（主视图、俯视图、侧视图）。遵循 BSI 标准（如 BS 8888）。

Isometric Drawing – A pictorial projection where three axes are equally foreshortened (120° apart). Shows 3D appearance on 2D paper.

等轴测图 – 一种图形投影，三轴均等缩短（夹角120°），在二维纸上呈现三维外观。

Dimensioning – Adding sizes and locations to drawings. Rules: avoid duplication, place outside views, use leader lines and extension lines.

尺寸标注 – 在图纸上添加尺寸和位置信息。规则：避免重复、置于视图外、使用引线和尺寸界线。

Tolerance – Permissible variation in a dimension. Ensures parts fit and function. Indicated as ± value or limits.

公差 – 尺寸的允许变动量。确保零件配合和功能。用 ± 数值或极限尺寸表示。

Fit – Relationship between mating parts: clearance (gap), interference (press fit), transition (either). Dependent on tolerances.

配合 – 配合零件间的关系：间隙配合、过盈配合、过渡配合（可能是间隙或过盈）。取决于公差。

CAD (Computer-Aided Design) – Using software to create precise 2D or 3D models. Enables simulation, rendering and rapid modification.

CAD（计算机辅助设计） – 使用软件创建精确的二维或三维模型，可进行仿真、渲染和快速修改。

Bill of Materials (BOM) – A list of components, materials and quantities needed to manufacture an assembly. Essential for procurement.

物料清单 (BOM) – 制造装配体所需的零部件、材料和数量清单，对采购至关重要。

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6. Project Management and Quality | 项目管理与质量

Gantt Chart – A bar chart showing project tasks, durations and dependencies over time. Horizontal axis = time; vertical = tasks.

甘特图 – 用条形图显示项目任务、工期及其时间依赖关系。横轴为时间，纵轴为任务。

Critical Path Method (CPM) – The longest sequence of dependent tasks that determines the shortest project duration. No float/slack on the critical path.

关键路径法 (CPM) – 决定项目最短工期的依赖任务序列。关键路径上的任务无浮动时差。

PERT (Programme Evaluation and Review Technique) – Uses optimistic, pessimistic and most likely time estimates to handle uncertainty. Useful for complex projects.

PERT（计划评审技术） – 利用乐观、悲观和最可能时间估算处理不确定性，适用于复杂项目。

Quality Control (QC) – Inspection and testing of products to detect defects. Reactive approach: identify non-conforming items.

质量控制 (QC) – 对产品进行检验和测试以发现缺陷。反应性方法：识别不合格品。

Quality Assurance (QA) – Proactive system of processes and standards to prevent defects. Covers the whole production lifecycle.

质量保证 (QA) – 预防缺陷的主动式流程和标准体系，覆盖整个生产生命周期。

Total Quality Management (TQM) – Organisation-wide commitment to continuous improvement, customer satisfaction and employee involvement. Drives culture change.

全面质量管理 (TQM) – 全组织致力于持续改进、客户满意和员工参与的承诺，推动文化变革。

Six Sigma – Data-driven methodology to reduce defects to 3.4 per million opportunities. Follows DMAIC: Define, Measure, Analyse, Improve, Control.

六西格玛 – 数据驱动的方法论，将缺陷降至百万分之3.4。遵循 DMAIC：定义、测量、分析、改进、控制。

Kaizen – Japanese philosophy of continuous, incremental improvement involving all employees. “Change for better.”

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