📚 A-Level Edexcel Engineering: Quick Vocabulary Reference Guide | A-Level Edexcel 工程：词汇术语速记指南
Mastering the specific language of engineering is crucial for success in the A-Level Edexcel Engineering exam. This guide provides a quick, bilingual reference to essential terminology, helping you reinforce definitions and link concepts across mechanics, materials, electronics, and manufacturing. Each term is paired with a clear explanation and its Chinese equivalent to support revision and deepen understanding.
掌握工程领域的专业术语是 A-Level Edexcel 工程考试取得成功的关键。本指南为您提供了核心词汇的双语速查参考，帮助您巩固定义并串联力学、材料、电子学和制造等不同领域的概念。每个术语都配有清晰的解释及其中文对应词，以辅助复习并加深理解。
1. Mechanics and Forces | 力学与力
Mechanics forms the backbone of engineering, dealing with how objects behave under the action of forces. The terms below are encountered in all branches from structural to dynamic systems.
力学是工程学的基础，研究物体在力作用下的行为。以下术语出现在从结构到动力系统的所有分支中。
| Term | Definition (English & 中文) |
|---|---|
| Force (F) | A push or pull on an object, measured in newtons (N). 力 – 作用在物体上的推或拉，单位是牛顿 (N)。 |
| Moment (M) | The turning effect of a force about a point, M = F × d, where d is the perpendicular distance (metre). 力矩 – 力绕某点的转动效应，M = F × d，d 为垂直距离（米）。 |
| Torque | A rotational moment, often used to describe the twisting action on a shaft, units N m. 扭矩 – 一种旋转力矩，常用于描述轴上扭转作用，单位 N m。 |
| Couple | A pair of equal and opposite parallel forces that produce pure rotation, its moment equals force × distance between forces. 力偶 – 一对大小相等、方向相反的平行力，产生纯转动，力偶矩 = 力 × 力之间的垂直距离。 |
| Resultant | A single force that has the same effect as all the original forces acting on a body. 合力 – 与多个原有力对物体作用效果相同的一个力。 |
| Equilibrium | State where the net force and net moment on a body are both zero, leaving it at rest or moving uniformly. 平衡 – 作用在物体上的合力和合力矩都为零的状态，物体静止或匀速运动。 |
For revision, remember that a ‘couple’ always creates rotation without translation, while a ‘moment’ can result from a single force. In equilibrium problems, always resolve forces into horizontal and vertical components.
复习时请记住，‘力偶’始终产生转动而不产生平动，而‘力矩’可由单个力产生。在解决平衡问题时，务必将力分解为水平和垂直分量。
2. Materials and Their Properties | 材料及其性能
Selecting the right material requires knowledge of mechanical, thermal, and electrical properties. Edexcel expects you to link the terms below to stress-strain curves and real-world applications.
选择合适的材料需要掌握其力学、热学和电学性能。Edexcel 考试要求你将下列术语与应力-应变曲线及实际应用联系起来。
| Term | Definition (English & 中文) |
|---|---|
| Young’s modulus (E) | A measure of stiffness, E = stress/strain within the elastic limit, unit Pa or N/m². 杨氏模量 (E) – 刚度的量度，E = 应力/应变（弹性限度内），单位 Pa 或 N/m²。 |
| Tensile strength | The maximum stress a material can withstand while being stretched before necking. 抗拉强度 – 材料在被拉伸时，在出现颈缩前所能承受的最大应力。 |
| Ductility | The ability of a material to be drawn into a wire or to undergo large plastic deformation before fracture. 延展性 – 材料可拉成丝或在断裂前发生较大塑性变形的能力。 |
| Brittleness | A property where a material fractures with little plastic deformation; opposite of ductility. 脆性 – 材料在极少塑性变形下断裂的性质，与延展性相反。 |
| Hardness | Resistance to indentation or scratching, often tested by Brinell or Rockwell methods. 硬度 – 抵抗压入或刻划的能力，常用布氏或洛氏方法测试。 |
| Toughness | The ability to absorb energy before fracturing, indicated by the area under the stress-strain curve. 韧性 – 材料在断裂前吸收能量的能力，由应力-应变曲线下面积表示。 |
A common mistake is confusing stiffness with strength. Young’s modulus measures stiffness, while tensile strength measures the peak stress. Use a mnemonic: ‘Stiff springs have high E; strong ropes have high sigma.’
一个常见错误是混淆刚度与强度。杨氏模量衡量刚度，抗拉强度衡量最大应力。可用助记：‘硬弹簧 E 高；强绳索 σ 高。’（σ 表示强度）。
3. Structures and Stress Analysis | 结构与应力分析
Structural analysis uses specialised vocabulary to describe internal forces and deformation. Familiarity with these terms is essential for beam calculations and truss problems.
结构分析使用专门的术语来描述内力和变形。熟悉这些术语对于梁计算和桁架问题至关重要。
| Term | Definition (English & 中文) |
|---|---|
| Stress (σ) | Internal force per unit area, σ = F/A, unit Pa. Normal stress acts perpendicular to the cross-section. 应力 – 单位面积上的内力，σ = F/A，单位 Pa。正应力垂直于截面作用。 |
| Strain (ε) | A dimensionless measure of deformation, e.g., tensile strain ε = ΔL/L₀. 应变 – 无量纲的变形量，如拉伸应变 ε = ΔL/L₀。 |
| Shear stress (τ) | Stress acting parallel to the plane of interest, τ = F/A parallel. 剪应力 – 平行于作用面作用的应力，τ = 平行力/面积。 |
| Bending moment | The internal moment that causes a beam to bend; varies along the length. 弯矩 – 导致梁弯曲的内力矩；沿长度方向变化。 |
| Deflection | The displacement of a structural element under load, especially the vertical movement of a beam. 挠度 – 构件在荷载下的位移，尤指梁的竖向位移。 |
| Factor of safety | Ratio of ultimate stress to allowable working stress, ensuring a design can support loads beyond the expected maximum. 安全系数 – 极限应力与许用工作应力的比值，确保设计能承受超过预期最大值的载荷。 |
When sketching shear force and bending moment diagrams, recall that the maximum bending moment often occurs where shear force is zero. Use the simple beam equations for point loads and uniformly distributed loads.
在绘制剪力图和弯矩图时，记住最大弯矩通常出现在剪力为零处。运用简支梁在集中荷载和均布荷载下的基本方程。
4. Thermodynamics and Energy | 热力学与能量
Thermodynamic principles underpin engine cycles, heat exchangers, and energy conversion. Edexcel questions often involve internal energy, enthalpy, and the First Law.
热力学原理是发动机循环、换热器及能量转换的基础。Edexcel 试题常涉及内能、焓以及热力学第一定律。
| Term | Definition (English & 中文) |
|---|---|
| Internal energy (U) | Sum of the kinetic and potential energies of all particles in a system. 内能 – 系统中所有粒子的动能与势能之和。 |
| Enthalpy (H) | Thermodynamic property H = U + pV, useful for constant-pressure processes. 焓 – 热力学性质，H = U + pV，在恒压过程中很有用。 |
| Specific heat capacity (c) | Energy required to raise the temperature of 1 kg of a substance by 1 °C (or 1 K), unit J/(kg K). 比热容 – 使 1 kg 物质温度升高 1 °C（或 1 K）所需的能量，单位 J/(kg K)。 |
| Latent heat (L) | Energy absorbed or released during a phase change at constant temperature, e.g., latent heat of fusion. 潜热 – 在恒温相变过程中吸收或释放的能量，如熔化潜热。 |
| First Law of Thermodynamics | Energy cannot be created or destroyed; ΔU = Q – W (work done BY system). 热力学第一定律 – 能量守恒；ΔU = Q – W（系统对外做功）。 |
| Efficiency | Ratio of useful energy output to total energy input, often expressed as η = W_out / Q_in. 效率 – 有用输出能量与总输入能量之比，常表示为 η = W_out / Q_in。 |
Be careful with the sign convention: in engineering, W is usually work done BY the system. The formula ΔU = Q – W then means heat added minus work done. Always check which convention your exam board uses.
注意符号规定：工程中 W 通常表示系统对外做的功。此时 ΔU = Q – W 表示加入的热量减去对外做功。务必确认考试局采用的规定。
5. Fluid Mechanics | 流体力学
Fluid systems appear in hydraulics, aerodynamics, and pipe flow. Key vocabulary includes pressure, flow rate, and the Bernoulli principle.
流体系统出现在液压、空气动力学和管道流动中。关键词汇包括压力、流量和伯努利原理。
| Term | Definition (English & 中文) |
|---|---|
| Pressure (p) | Force per unit area exerted by a fluid, p = F/A, unit Pa. 压力 – 流体施加的单位面积上的力，p = F/A，单位 Pa。 |
| Density (ρ) | Mass per unit volume, ρ = m/V, unit kg/m³. 密度 – 单位体积的质量，ρ = m/V，单位 kg/m³。 |
| Volumetric flow rate (Q) | Volume of fluid passing a section per unit time, Q = A × v, unit m³/s. 体积流量 – 单位时间内通过某截面的流体体积，Q = A × v，单位 m³/s。 |
| Viscosity | A fluid’s resistance to flow; dynamic viscosity (η) measured in Pa·s. 粘度 – 流体对流动的阻力；动力粘度 (η) 单位 Pa·s。 |
| Bernoulli’s equation | For an ideal, incompressible flow: p + ½ρv² + ρgh = constant along a streamline. 伯努利方程 – 对于理想不可压缩流体沿流线：p + ½ρv² + ρgh = 常量。 |
| Reynolds number (Re) | Dimensionless number predicting flow regime: Re = ρvD/η. Low Re → laminar; high Re → turbulent. 雷诺数 – 预测流态的无量纲数：Re = ρvD/η。低 Re → 层流；高 Re → 湍流。 |
Remember that Bernoulli’s equation assumes steady, inviscid, incompressible flow along a streamline. In real systems, energy losses due to friction must be accounted for.
记住伯努利方程假设定常、无粘、不可压缩的沿流线流动。在实际系统中，需考虑摩擦造成的能量损失。
6. Electrical Principles and Circuits | 电学原理与电路
Electrical engineering terms cover everything from basic circuit laws to power and energy. These are fundamental to analysing both analogue and digital systems.
电工术语涵盖了从基本电路定律到功率和能量的所有内容。这些是分析模拟和数字系统的基础。
| Term | Definition (English & 中文) |
|---|---|
| Voltage (V) | The electrical potential difference between two points, driving current; unit volt (V). 电压 – 两点间的电势差，驱动电流；单位伏特 (V)。 |
| Current (I) | The rate of flow of electric charge, I = Q/t; unit ampere (A). 电流 – 电荷流动的速率，I = Q/t；单位安培 (A)。 |
| Resistance (R) | Opposition to current flow in a conductor, R = V/I; unit ohm (Ω). 电阻 – 导体对电流的阻碍作用，R = V/I；单位欧姆 (Ω)。 |
| Ohm’s law | For a metallic conductor at constant temperature, V = IR. 欧姆定律 – 对于恒温下的金属导体，V = IR。 |
| Power (P) | Rate of energy transfer; in DC circuits, P = VI = I²R = V²/R; unit watt (W). 功率 – 能量转换的速率；在直流电路中 P = VI = I²R = V²/R；单位瓦特 (W)。 |
| Kirchhoff’s laws | KCL: sum of currents entering a node = 0. KVL: sum of voltages around a closed loop = 0. 基尔霍夫定律 – KCL：进入节点的电流代数和为零。KVL：闭合回路中电位升的代数和为零。 |
A quick check for Ohm’s law validity: it only holds when resistance is constant. For components like diodes or filament lamps, resistance changes with current, so V-I graphs are non-linear.
快速检验欧姆定律的有效性：它只在电阻恒定时成立。对于二极管或灯丝等元件，电阻随电流变化，因此 V-I 图为非线性。
7. Electronics and Digital Logic | 电子学与数字逻辑
From diodes to microcontrollers, electronic terms appear in system design and signal processing. Boolean logic is essential for control circuits.
从二极管到微控制器，电子学术语出现在系统设计和信号处理中。布尔逻辑对于控制电路至关重要。
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