5- Major Developments In Technology Flashcards
(41 cards)
How have advances in manufacturing technology resulted in change in products developed?
- miniaturised range of products
-increasingly powerful products
What are the uses of vacuum tubes ( thermionic valves) ?
Amplifiers/radios/TV and computers
What are the benefits of using thermionic valves?
- radiation hardness( resistance to radiation and electromagnetic pulses)
-Gradual fail( expressed through performance quality which gradually decreases overtime)
What are the disadvantages of using the thermionic valves?
- Energy in efficient ( requires significant power to heat up the cathode to release electrons )
- Fragile( made from glass so can easily be broken making it less durable)
- Valves required time to heat up ( time is required to start the electronic before function )
- Large size and weight ( unsuitable for compact portable products )
What are the uses of transistor transistors(semiconductor) ?
- portable radiators and other products that are reduced in size
What are the advantages to using semiconductors/transistors ?
- cheap ( enables affordable products to be produced)
- Solid components ( no mechanical parts meaning less wear and more durable )
- Low power use ( energy efficient )
What are the disadvantages to using semiconductors/transistors ?
- easily damaged (through reverse voltage , static electricity and breaks due to high voltage)
- Temperature sensitive meaning can fail at high temperatures
What are the uses of micro electronics ICS?
- powerful computers and highly portable devices such as music players
What are the advantages of micro electronics a.k.a. integrated circuits IC?
-Low cost( cheap to manufacture making it mass produced)
- Small sizes( enables portable space saving products)
- High speed operation ( fast travelling signals )
What are disadvantages of using micro electronics a.k.a. integrated circuits ic ?
- Thermal sensitive( high temperature equals high resistance)
- Limited repairability ( repair if Ic broke)
- Radiation sensitive ( radiation can disturb signals and damage parts of the ICs )
What is meant by the term new materials ?
-a recently developed/advanced or improved material that offers a better performance/functionality or sustainability
What is glulam ?
Layer timber and glued together to create various components
What are the properties of Gulam?
-good strength to weight ratio
- ease of forming and shaping with minimal energy
- eliminates timber defects
-Sustainable
What are the uses of glulam and what is an example?
-/buildings/structures and bridges
- An example is the keystone Weybridge
What is Kevlar?
A form of aromatic polyamide ( ring like molecules connected in long chains )
-They are often combined with resins into advanced composite materials
Uses of Kevlar ?
- Bulletproof vests and puncture resistant tyres as well as aeronautical applications
What are the properties of Kevlar ?
- good toughness and tensile strength due to strong chemical bonds between its molecular structures
What is precious metal clay?
A craft material consisting of microscopic particles of gold/silver and other metals bound in a pliable material.
How did precious metals clays work?
- sintering process ( temperature is raised to the particles fuse together and the binding material is burnt off )
What are the properties of PMC?
Easily hand shaped into detailed shapes require minimal traditional processes and tools
Uses of PMC
Jewellery and decorative items
What is graphene nano material?
A two dimensional form of carbon with a honeycomb like structure
Properties of graphene
- when rolled into tubular form it has a high tensile strength and hardness
- good electrical conductivity
-Good heat resistance
Uses of graphene ?
Medical treatments/advanced coatings/nano electronic devices as well as batteries
- Samsung exploring and using graphing coated animals to increase the battery life of their products
