Secondary 3 Design & Technology
S3 Design & Technology: sustainable material choice, mechanism design, advanced machines and instruments, product design (CAD, ergonomics and IP), automation, and a control-system project — bridging to senior secondary Design and Applied Technology.
The order below is the recommended shallow-to-deep path.
Units 單元
Tap a unit name to jump to its topics.
物料及資源 Materials & resources1/1 live
⚡ Unit quiz 快測5 Qs
Answer on your own first, then reveal — wrong answers go to your wrong-answer book.
Q1What does the number 5 in the triangle on a bottle base mean? A. PET drink bottles B. PP food boxes C. foam polystyrene
Q2Which material does the yellow bin collect in Hong Kong? A. paper B. metal cans C. plastics
Q3Why is reusing usually more sustainable than recycling?
Q4Which two design decisions make a product easier to recycle?
Q5How should an old refrigerator be handled when buying a new one?
結構及機械結構 Structures & mechanisms1/1 live
⚡ Unit quiz 快測5 Qs
Answer on your own first, then reveal — wrong answers go to your wrong-answer book.
Q1The driver has 20 teeth and the driven wheel 60. What is the ratio and the output speed?
Q2Why do lifting platforms often use screw mechanisms rather than gear trains?
Q3What changes when a cam's profile changes?
Q4Which mechanism raises and lowers a drill press table?
Q5What criteria guide mechanism choice in a dynamic product?
工具及儀器 Tools & instruments1/1 live
⚡ Unit quiz 快測5 Qs
Answer on your own first, then reveal — wrong answers go to your wrong-answer book.
Q1What is the basic principle of vacuum forming?
Q2Why must PVC never be laser cut?
Q3What shapes suit 3D printing best, and why?
Q4What is a multimeter's continuity test for?
Q5Which instrument logs temperature for an hour at a time?
製造過程 Manufacturing processes1/1 live
⚡ Unit quiz 快測5 Qs
Answer on your own first, then reveal — wrong answers go to your wrong-answer book.
Q1Which of copyright, trademark, patent and registered design takes effect automatically?
Q2What advantages does CAD have over freehand drawing?
Q3What are the four basic manufacturing processes?
Q4What do designers and engineers each focus on?
Q5Why must products meet industry standards before sale?
系統概念 Systems concepts1/1 live
⚡ Unit quiz 快測5 Qs
Answer on your own first, then reveal — wrong answers go to your wrong-answer book.
Q1Which component turns commands into real action?
Q2Is an air conditioner's thermostatic control open or closed loop, and why?
Q3What are the benefits of subsystem analysis?
Q4Which is a manual system? A. sensor tap B. traditional tap C. thermostatic kettle
Q5What does feedback do in an automated system?
系統應用 Systems applications1/1 live
⚡ Unit quiz 快測5 Qs
Answer on your own first, then reveal — wrong answers go to your wrong-answer book.
Q1What is a reed switch best at detecting?
Q2What does a relay do?
Q3What does a directional control valve do in a pneumatic system?
Q4How do single-acting and double-acting cylinder symbols differ?
Q5Why simulate before building in a project?
Vocabulary book 生字簿
All terms, bilingual (printable).
A triangle of chasing arrows showing a material can be recycled.
A number from 1 to 7 inside a triangle marking the plastic type for sorting.
Using an item again after cleaning or repair, without reprocessing.
Processing waste back into raw material for new products.
Meeting today's needs without hurting future generations' ability to meet theirs.
A site where waste that cannot be recycled is buried.
All stages of a product from raw material to disposal.
A scheme making producers share the cost of collecting and treating their waste products.
Designing a product from one material so it is easier to sort and recycle.
Turning waste into items of higher value, such as bags made from old jeans.
A toothed wheel that passes rotation by meshing, changing speed, direction and torque.
The ratio of driver to driven gear speed, set by their tooth counts.
A screw and nut pair turning rotation into slow, strong linear motion.
A drive where a worm meshes with a wheel, giving large reduction and self-locking.
A bar pivoting about a fulcrum to pass or magnify force and motion.
Bars joined by pivots that carry motion from one place to another.
A shaped rotating part that pushes a follower to create planned reciprocation.
The part riding on a cam's profile, moving with its rises and falls.
A pinion turning a toothed bar, converting between rotation and linear motion.
The property of refusing to back-drive under reversed force, as in a worm drive.
A machine spinning the workpiece against a tool to cut round forms.
Heating a plastic sheet until soft, then sucking it down over a mould.
Cutting or engraving material with a high-energy laser following a digital path.
Additive making that stacks material layer by layer from a digital model.
Quickly making samples to test and prove a design.
An instrument measuring voltage, current and resistance and testing continuity.
An instrument that connects sensors and records data automatically over time.
The material or part being machined.
The form that shapes material; used in vacuum forming and moulding.
Goggles, masks, tight sleeves and tied-back hair that keep the operator safe.
Drawing and editing designs or 3D models with computer software.
A digital solid built in the computer, viewable and editable from any angle.
Fitting products to human size and habits for comfort and safety.
Technical rules the industry follows to keep products safe and sound.
Legal rights protecting creations and inventions, including copyright, trademark, patent and registered design.
The automatic right protecting original expression once a work is created.
A mark identifying a product's source, protected once registered.
A right protecting a new technical solution, granted after examination.
A registered right protecting a product's shape, pattern and colour.
Finishing such as painting or plating that fights corrosion and improves looks.
A system that senses, decides and acts on its own without continuous human operation.
A system whose every step is operated and controlled by a person.
A part detecting environmental changes and turning them into signals.
The part that receives signals, decides and issues commands.
The part that turns commands and energy into action, such as a motor or cylinder.
An independent block within a larger system, handling one function.
Returning the output to the controller for comparison so later actions are corrected.
The current, air pressure or data carrying information inside a system.
A door opened and closed automatically by sensing and drive systems.
Control that holds a set temperature automatically from temperature sensing.
The part taking information from the world and turning it into signals.
The part judging signals by logic and deciding the output.
The part that acts — LEDs, buzzers and motors.
A sensor whose resistance changes with light level.
A switch that conducts when a magnet comes near, used on doors and windows.
A small programmable chip, the processing heart of a control system.
An electromagnetic switch letting a small current control a large one.
An actuator using compressed air to drive a piston back and forth.
The valve directing compressed air to extend or retract a cylinder.
Testing a system's logic in software or on a kit before building.