828693
Descrição
FlashCards por charlotte-clayto, atualizado more than 1 year ago
|
Criado por charlotte-clayto
quase 11 anos atrás
|
|
| Questão | Responda |
| 1930s | - Radios became commercially available from the late 1920s. - The radio casing reflected the strong reliance on hand crafted furniture, mostly Art Deco. - The electronics inside were powered using thermonic valves. - There were few electronics inside with very large loudspeakers. - Large amounts of copper wire were used to connect the components. - Lots of space was needed around the components to allow for dissipation of heat. - The radio was extremely heavy due to the wooden casing. |
| 1940s and 1950s | - Radios were being made from newly developed plastics, mainly Bakerlite. - THE TRANSISTOR: this was made from two types of semi-conducting materials, n-type and p-type. They work as an electronic switch, that control the flow of electrons, effectively providing amplification. - Transistors need considerably less power than thermonic valves, meaning circuits that needed less power could be developed. - This led to a reduction in size of components, allowing the radio to be portable. - The copper wires were being replaced by conductors. |
| 1960s | - The cases were being made from bent wood veneers - These were a much coarser construction that the cabinets of the 1930s and were therefore covered in a plastic leatherette. - The sound quality was also greatly improved. |
| 1970s | - There was an increased used of thermoplastics such as acrylic based. - This made it possible to use injection moulding to manufacture the cases, and consequently mould ergonomic and styling features too. - The continued reduction in size and power consumption of the further reduced the overall size. - Mountings and brackets for circuits could be included in one single moulding process, and little finishing is required. - Electronics have become much smaller and the energy required for them is extremely low, reducing the need for a large battery and any extra space to dissipate heat, making it much smaller. |
| 1970s to Recent Yeard | - The introduction of the microchip revolutionalised the design and manufacture of electronic products, making it possible to minimise radios and increase the range of features available to the consumer. - The carbon rod aerial used in the 1960s was replaced by using the headphone wire as an aerial, further reducing the size. |
Quer criar seus próprios Flashcards gratuitos com GoConqr? Saiba mais.