Year 10 WJEC Engineering: Core Knowledge Review | 英国WJEC十年级工程：核心知识点梳理

📚 Year 10 WJEC Engineering: Core Knowledge Review | 英国WJEC十年级工程：核心知识点梳理

Engineering at Year 10 under the WJEC specification brings together materials science, mechanical principles, electronics, and the design process. This article walks you through the key knowledge areas you need to master, from material properties to manufacturing techniques and circuit analysis. Whether you are preparing for an end‑of‑unit test or building your portfolio, these clear bilingual explanations will help secure your understanding and application skills.

WJEC十年级工程课程融合了材料科学、机械原理、电子学和设计流程。本文将带你逐一梳理必须掌握的核心知识领域，包括材料性能、制造工艺和电路分析。无论是准备单元考试还是完善课程作品集，这些清晰的中英双语解释都将帮助你巩固理解并提升应用能力。

1. Material Families and Their Properties | 材料家族及其性能

Engineering materials are grouped into families: metals, polymers, ceramics, composites, and smart materials. Each family has distinct physical and mechanical properties that determine its suitability for a given application. Key terms include tensile strength, hardness, toughness, ductility, and conductivity.

工程材料按家族分类：金属、聚合物、陶瓷、复合材料和智能材料。每个家族都有不同的物理和机械性能，决定了它适合哪种应用。关键术语包括抗拉强度、硬度、韧性、延展性和导电性。

For example, low‑carbon steel (a ferrous metal) offers high tensile strength and is widely used in structural frames. Aluminium alloys are lightweight and corrosion‑resistant, making them ideal for aircraft bodies. Thermoplastics like acrylic can be reheated and reshaped, while thermosetting plastics such as epoxy resin cannot be remoulded once set.

例如，低碳钢（一种黑色金属）具有高抗拉强度，广泛用于结构框架。铝合金重量轻且耐腐蚀，非常适合飞机机身。热塑性塑料如亚克力可以重新加热成型，而热固性塑料如环氧树脂一旦固化就无法再塑形。

Material family	Typical properties	Common uses
Ferrous metals	Strong, magnetic, rust‑prone	Bridges, car bodies
Non‑ferrous metals	Lighter, corrosion‑resistant	Wiring, cans, aircraft
Thermoplastics	Recyclable, soften on heating	Bottles, toys
Ceramics	Hard, brittle, heat‑resistant	Tiles, spark plugs

2. Mechanical Properties and Testing | 力学性能与测试

Engineers rely on standard tests to measure material behaviour under load. Tensile testing using a universal testing machine reveals the yield point, ultimate tensile strength (UTS), and elongation at break. The stress‑strain graph is a core tool for comparing materials.

工程师依赖标准测试来衡量材料在载荷下的行为。使用万能试验机进行拉伸测试可以揭示屈服点、极限抗拉强度（UTS）和断裂伸长率。应力‑应变图是比较材料的核心工具。

Hardness tests include the Brinell, Vickers, and Rockwell methods, each using an indenter and measuring the depth or width of the impression. Toughness is evaluated through impact tests such as the Izod or Charpy test, where a pendulum strikes a notched specimen to measure energy absorbed.

硬度测试包括布氏、维氏和洛氏方法，每种方法使用压头并测量压痕的深度或宽度。韧性通过冲击测试（如艾氏或夏比冲击测试）进行评估，摆锤撞击带缺口试样并测量吸收的能量。

The formula for stress is σ = F / A, where F is force (N) and A is original cross‑sectional area (m²). Strain ε = ΔL / L₀ is dimensionless.

应力公式为 σ = F / A，其中 F 是力（N），A 是原始截面积（m²）。应变 ε = ΔL / L₀ 无单位。

3. Engineering Drawing and Conventions | 工程制图与标准

Accurate communication of design ideas relies on technical drawings to British Standard BS 8888. Orthographic projection uses the third angle method, where the view from the top is placed above the front view, and the view from the left is placed to the left.

设计意图的准确传达依赖于符合英国标准 BS 8888 的技术图纸。正交投影采用第三角投影法，俯视图放在前视图的上方，左视图放在左方。

Dimension lines are drawn with thin continuous lines, and measurements are usually in millimetres without the unit symbol. Hidden details are shown as dashed lines of medium thickness. Sectional views help reveal internal features, with hatching at 45° and a constant spacing.

尺寸线使用细实线绘制，尺寸通常以毫米为单位，不写单位符号。隐藏细节用中等粗细的虚线表示。剖视图有助于显示内部特征，剖面线画成 45°、间距均匀的斜线。

Isometric drawing is a pictorial method where the three axes are 120° apart, allowing a 3D representation without perspective. It is particularly useful in assembly instructions and concept sketches.

等角图是一种立体画法，三根轴线彼此呈120°，能够无透视地表现三维形状。它在装配说明和概念草图中尤为常用。

4. Manufacturing Processes: Shaping and Forming | 制造工艺：成型与变形

Shaping processes change the geometry of a workpiece. Casting involves pouring molten metal into a mould cavity. Sand casting is the most common method for ferrous metals, while die casting is used for high‑volume non‑ferrous parts.

成型工艺改变工件的几何形状。铸造是将熔融金属浇入模具型腔。砂型铸造是黑色金属最常用的方法，而压铸则用于大批量非铁件。

Forging uses compressive forces to shape metal, improving grain structure and strength. Rolling reduces thickness of slabs, while extrusion forces material through a die to create long profiles with a constant cross‑section. Bending and press forming are essential for sheet metal components.

锻造利用压缩力使金属成型，改善晶粒结构并提升强度。轧制可减薄板坯厚度，而挤压则是迫使材料通过模具，产生横截面恒定的长型材。弯曲和冲压成型对于钣金零件至关重要。

For plastics, injection moulding forces molten polymer into a closed mould at high pressure, ideal for complex shapes like phone cases. Vacuum forming heats a thermoplastic sheet and draws it over a mould using vacuum, suitable for packaging trays and signs.

对于塑料，注塑成型在高压下将熔融聚合物注入闭合模具，适合手机壳等复杂形状。真空成型加热热塑性板材，通过真空将其吸附在模具上，适用于包装托盘和标牌。

5. Machining and Joining Techniques | 机加工与连接技术

Machining removes material to achieve precise dimensions. Turning on a lathe rotates the workpiece against a cutting tool to produce cylindrical shapes. Milling uses a rotating multi‑tooth cutter to remove material from a stationary workpiece, allowing flat surfaces, slots, and complex profiles.

机加工通过去除材料来获得精确尺寸。车削在车床上旋转工件，用刀具切削产生圆柱形。铣削使用旋转多齿刀具从固定工件上去除材料，可以加工平面、槽和复杂轮廓。

Drilling creates holes using a twist drill; reaming then improves the hole accuracy and surface finish. Computer‑numerical‑control (CNC) machines follow coded instructions to automate these processes, enhancing repeatability.

钻孔使用麻花钻头产生孔；铰孔则提高孔的精度和表面光洁度。计算机数控（CNC）机器遵循编码指令来自动化这些过程，提高一致性。

Joining methods include welding, where metals are fused at high temperature with or without filler material. Brazing and soldering use a lower‑melting‑point filler without melting the base metals. Adhesive bonding and mechanical fasteners (bolts, rivets) offer alternatives where heat would damage materials.

连接方法包括焊接，在高温下熔化金属（用或不用填充材料）。钎焊和软钎焊使用熔点较低的填充金属，不熔化母材。胶粘和机械紧固件（螺栓、铆钉）在加热可能损坏材料时作为替代方案。

6. Mechanical Systems: Levers and Linkages | 机械系统：杠杆与连杆

A lever is a simple machine that amplifies an input force to provide a greater output force or movement. It consists of a rigid bar pivoted at a fulcrum. The principle of moments states that for equilibrium, the sum of clockwise moments equals the sum of anticlockwise moments: F₁ × d₁ = F₂ × d₂, where d is the perpendicular distance from the fulcrum.

杠杆是一种简单机械，能够将输入力放大，产生更大的输出力或运动。它由刚性杆绕支点转动构成。力矩原理表明，平衡状态下顺时针力矩之和等于逆时针力矩之和：F₁ × d₁ = F₂ × d₂，其中 d 是从支点开始的垂直距离。

There are three classes of lever. Class 1 has the fulcrum between effort and load (e.g., pliers). Class 2 has the load between fulcrum and effort (e.g., wheelbarrow). Class 3 has the effort between fulcrum and load (e.g., tweezers). Engineering students need to identify the class and calculate mechanical advantage (MA = load/effort) and velocity ratio.

杠杆分为三类。一类杠杆支点在施力点和负载之间（如钳子）。二类杠杆负载在支点和施力点之间（如手推车）。三类杠杆施力点在支点和负载之间（如镊子）。工科学生需要识别杠杆类别，计算机械效益（MA = 负载/作用力）和速比。

Linkages convert one type of motion to another. A reverse motion linkage makes two levers move in opposite directions. A bell crank changes the direction of motion through 90°. Parallel motion linkages keep connected parts moving parallel to each other.

连杆机构将一种运动转换为另一种。反向连杆使两根杠杆反向运动。曲柄连杆可将运动方向改变 90°。平行运动连杆保持连接部件彼此平行移动。

7. Pulleys, Gears, and Drive Systems | 滑轮、齿轮与传动系统

Pulley systems use wheels and a rope or belt to transmit rotational motion and force. A fixed pulley changes the direction of the effort but offers no mechanical advantage (MA = 1). A movable pulley reduces the needed effort, giving MA > 1. Compound pulley systems further increase MA, calculated by counting the rope sections supporting the load.

滑轮系统利用轮子和绳索或皮带传递旋转运动和力。定滑轮改变力的方向，但不提供机械效益（MA = 1）。动滑轮减少所需作用力，提供 MA > 1。复式滑轮组进一步提高机械效益，通过数支撑负载的绳段数来计算。

Gears transmit rotary motion and torque between shafts. A driver and driven gear form a simple gear train. The velocity ratio (VR) is the number of teeth on the driven gear divided by the number of teeth on the driver. Idler gears reverse direction without changing VR. Compound gears achieve high reduction ratios in compact spaces.

齿轮在轴之间传递旋转运动和扭矩。主动轮和从动轮构成简单轮系。速比（VR）等于从动轮齿数除以主动轮齿数。惰轮只改变方向，不改变速比。复合齿轮在紧凑空间内实现高减速比。

In a belt and pulley drive, the velocity ratio is the diameter of the driven pulley D₂ divided by the driver diameter D₁. Slipping can occur, reducing efficiency. Gears, on the other hand, provide positive engagement with no slip.

在皮带与带轮传动中，速比是从动轮直径 D₂ 除以主动轮直径 D₁。可能出现打滑，降低效率。而齿轮提供正向啮合，不会打滑。

8. Basic Electronic Components | 基础电子元器件

Electronic circuits consist of input, process, and output blocks. Common input components include LDRs (light‑dependent resistors) whose resistance decreases as light intensity increases, and thermistors (NTC type) where resistance falls as temperature rises. Switches, push‑to‑make and push‑to‑break, control current flow.

电子电路由输入、处理和输出模块组成。常见输入元件包括光敏电阻（LDR），其电阻随光照强度增加而减小；以及热敏电阻（NTC型），温度升高时电阻下降。开关，包括常开按钮和常闭按钮，控制电流的通断。

Process components include transistors used as electronic switches or amplifiers. An NPN transistor turns on when a small base current flows, allowing a larger collector‑emitter current. The 555 timer IC can be configured in monostable or astable mode to generate timed pulses or continuous oscillations.

处理元件包括用作电子开关或放大器的晶体管。NPN 型晶体管在基极有小电流时导通，允许较大的集电极‑发射极电流流过。555 定时器集成电路可配置为单稳态或无稳态模式，产生定时脉冲或持续振荡。

Output devices convert electrical energy: LEDs emit light when forward‑biased, requiring a series resistor to limit current. Buzzers and loudspeakers produce sound, while motors and solenoids create movement. A relay allows a low‑voltage circuit to switch a high‑voltage load safely.

输出器件转换电能：LED 在正向偏置时发光，需要串联电阻限流。蜂鸣器和扬声器产生声音；电机和螺线管产生运动。继电器则允许低压电路安全地控制高压负载的开关。

9. Ohm’s Law and Circuit Calculations | 欧姆定律与电路计算

Ohm’s law is fundamental: V = I × R, where V is voltage (volts), I is current (amps), and R is resistance (ohms). In a series circuit, current is the same through all components, and total resistance R_total = R₁ + R₂ + … The supply voltage divides across resistors proportionally to their resistance.

欧姆定律是基础：V = I × R，其中 V 是电压（伏特），I 是电流（安培），R 是电阻（欧姆）。在串联电路中，电流处处相同，总电阻 R_total = R₁ + R₂ + … 电源电压按电阻大小比例分配。

In parallel circuits, the voltage across each branch is equal to the supply voltage. The total current is the sum of the branch currents. Total resistance follows the reciprocal rule: 1/R_total = 1/R₁ + 1/R₂ + … The battery or power supply provides the electromotive force (e.m.f.).

在并联电路中，各支路电压相等且等于电源电压。总电流等于各支路电流之和。总电阻遵循倒数公式：1/R_total = 1/R₁ + 1/R₂ + … 电池或电源提供电动势（e.m.f.）。

A potential divider uses two resistors in series to produce a fraction of the input voltage: V_out = V_in × (R₂ / (R₁ + R₂)). This principle is widely applied with sensor circuits, where replacing one resistor with an LDR or thermistor makes an automatic light or temperature sensor.

分压器使用两个串联电阻产生输入电压的一部分：V_out = V_in × (R₂ / (R₁ + R₂))。这一原理广泛应用于传感器电路，将其中一个电阻换为光敏电阻或热敏电阻，即可制成自动灯光或温度传感器。

10. Systems Approach and Microcontrollers | 系统思维与微控制器

Engineering problems are often solved by breaking them into systems: input → process → output. A microcontroller like the PICAXE or Arduino allows the process block to be programmed, making circuits more versatile. Flowcharts help plan the sequence of operations: start, decision, process, delay, and output.

工程问题常常通过分解为系统来解决：输入→处理→输出。像 PICAXE 或 Arduino 这样的微控制器，可以编程处理模块，使电路更加灵活。流程图有助于规划操作序列：开始、判断、处理、延时和输出。

In WJEC tasks, you may be asked to write a simple program using BASIC (for PICAXE) or a block‑based language. Typical commands include HIGH and LOW to set output pins, PAUSE for delays in milliseconds, and IF…THEN for decisions based on sensor readings. An analogue‑to‑digital converter (ADC) pin reads varying sensor voltages and converts them to a digital value (e.g., 0-255).

在 WJEC 任务中，你可能需要用 BASIC（对于 PICAXE）或图形化语言编写简单程序。典型指令包括 HIGH 和 LOW 设置输出引脚电平，PAUSE 用于延时（毫秒），IF…THEN 用于根据传感器读数做出判断。模数转换器（ADC）引脚读取变化的传感器电压，并将其转换为数字值（如 0–255）。

System integration also demands an understanding of power supply units, voltage regulation, and protection devices such as fuses and diodes to prevent reverse polarity damage.

系统集成还需要理解电源单元、稳压以及保险丝和二极管等保护装置，防止反接导致损坏。

11. Health, Safety, and Risk Assessment | 健康、安全与风险评估

Workshop safety is non‑negotiable in engineering. The Health and Safety at Work Act (1974) places a duty on employers and employees to ensure a safe working environment. Personal protective equipment (PPE) includes safety glasses, ear defenders, steel‑toe boots, and overalls.

车间安全在工程中不容忽视。《工作健康与安全法》（1974 年）规定雇主和雇员有责任确保安全的工作环境。个人防护装备（PPE）包括安全眼镜、护耳器、钢头鞋和工作服。

Risk assessment involves identifying hazards, estimating the likelihood and severity of harm, and implementing control measures. A typical hierarchy of control moves from elimination, substitution, engineering controls, administrative controls, to PPE as the last resort. COSHH regulations cover hazardous substances like solvents, adhesives, and dust.

风险评估包括识别危险、预估伤害的可能性和严重度，以及实施控制措施。典型的控制层级依次为消除、替代、工程控制、管理控制，最后才是个人防护装备。COSHH 法规涉及溶剂、粘合剂和粉尘等有害物质。

Safe use of machinery requires checking guards, emergency stop buttons, and interlocks. Manual handling technique (bending knees, keeping back straight) reduces injury risk when moving materials.

安全使用机器需要检查防护罩、急停按钮和联锁装置。人工搬运技巧（屈膝、保持背部直立）可降低搬运材料时的受伤风险。

12. The Design Process and Evaluation | 设计流程与评估

Engineering design follows an iterative cycle: define the problem, research, generate possible solutions, select and develop the best idea, model and prototype, test and evaluate, and manufacture. In Year 10, students document this process in their portfolios, showing evidence of sketches, CAD models, and reflection.

工程设计遵循迭代循环：定义问题、研究、生成可行方案、选择并深化最佳创意、建模与原型制作、测试与评估，然后制造。在十年级，学生在作品集中记录这一过程，展示草图、CAD 模型和反思等证据。

Evaluation considers whether the product meets the specification and fitness for purpose. It examines the choice of materials, manufacturing methods, cost, sustainability, and environmental impact. Lifecycle analysis (LCA) helps assess a product from raw material extraction to disposal or recycling.

评估要考量产品是否符合规格和适用性，审查材料选择、制造方法、成本、可持续性及环境影响。生命周期分析（LCA）有助于评估产品从原材料提取到处置或回收的全过程。

Effective product development also includes testing against performance criteria, gathering user feedback, and suggesting modifications. These skills are directly assessed in the WJEC controlled assessment.

有效的产品开发还包括根据性能标准进行测试，收集用户反馈，并提出修改建议。这些技能在 WJEC 控制评估中是直接考察的内容。

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Year 10 WJEC Engineering: Core Knowledge Review | 英国WJEC十年级工程：核心知识点梳理