Mr Ridley 😍😍 Flashcards
Why are electronics drawn as symbols?
Drawn as symbols for easy recognition worldwide
How do speakers work?
A diaphragm is moved with electromagnets. This makes the air move, creating sound waves
Why are exploded drawings used
Exploded drawings are used to show positions of parts relative to each other
Where are exploded diagrams used?
Exploded diagrams are often supplied with products to enable consumer to identify and order parts
How have new technologies occurred?
Through improvements in materials and manufacturing processes
3 examples of new technologies in phones
Lithium ion batteries
Touch screens
Cameras with high-quality image
Rechargeable batteries
Lithium ion
Small and lightweight
Around 1000 recharges
Touch screens
Mutual Capacitance Screen; MCS
3 points of contact
What to do with rechargeable batteries?
Contain harmful metals
Should never be thrown away
Either: recycle or return to manufacturer
WEEE directive
Aluminium
Light Malleable Conductive Corrosion resistant Expensive Difficult to weld
Stainless steel
Ferrous Tough Malleable Corrosion Resistant Expensive
What’s an alloy?
An alloy is a mixture of at least 2 elements where at least 1 is a metal
Why are alloys used
Alloys have properties superior to the base metals
What are electrical components assembled on?
Electrical components are assembled on Printed Circuit Board
Describe soldering on Printed Circuit Board?
Soldering iron touches the track
Next, solder is added and touches the copper track
The result is a smooth shiny finish
What is the frame of the phone made from?
Thermoplastic or an alloy
Where would injection moulding be used in a phone?
Back cover
Advantages of injection moulding
Complex shapes
Produced in high volumes
Wide variety of colours
Other details can be added to injection moulded parts, unlike with vacuum forming
Disadvantages of injection moulding
Expensive setup costs
Some shapes are impossible
3 things which make thermoplastics good to use
Can be recycled
Electrical insulators
Good surface finish
Why is HIPS used?
Can withstand high impact
Tough
Won’t bend
Can be recycled
Why is ABS used for the exterior of the case?
Tougher than HIPS Can withstand higher impacts than HIPS Durable Resists chemicals Lightweight BUT expensive Glossy finish
How is CNC used?
To produce complex shapes in metals from very accurate CAD drawings for phone cases
Describe Press Forming
Thin sheet metal pressed using dies and formers
Describe spot welding
2 pieces of sheet metal are held between electrodes. An electric current is passed between them. Steel is simultaneously heated and pressed together forming a welded joint.
What would die casting be used for?
Making the phone case
Anodising
A tough, hard-wearing coating of aluminium. Can come in a wide range of colours
What does Bluetooth do?
Bluetooth allows people to connect and communicate with a range of nearby devices
