Applications in electronics 1 for science
- 2. What is electronics? • Electronics means the study of the flow of electrons in electrical circuits.
- 3. Applications in electronics • Electronics has made tremendous advancement during last few decades and our day to day life involves the use of electronic devices.
- 4. Applications in electronics: Entertainment and communication • Availability of economical and fast means of communication paves the way for progress of a country. Few decades ago, the main application of electronics was in the field of telephony and telegraphy. • Now, with the aid of radio waves we can transmit any message from one place to another, without the use of wires. Radio and TV broadcasting offers a means of both entertainment as well as communication. Today, electronics gadgets are widely used for entertainment.
- 5. Applications in electronics: Entertainment and communication • Everyday household appliances rely on electric circuits for their operation (e.g. torches, mobile phones, iPods). • Today, electronics gadgets are widely used for entertainment.
- 6. Applications in electronics: Defence applications • Defence applications are completely controlled by electronic circuits. • RADAR (Radio and Detection and Ranging)is an important development in electronics. With the help of radar, it is possible to detect and find the exact location of enemy aircrafts. • Radar and anti craft guns can be linked by an automatic control system to make a complete unit.
- 7. Applications in electronics: Industry • Electronics circuits are widely being used in industrial applications such as control of thickness, quality, weight and moisture content of a material. • Electronic amplifier circuits are used to amplify signals and thus control the operations of automatic door openers, power systems and safety devices. • Electronically controlled systems are used for heating and welding in the industry. • The most important industrial application is that the power stations which generate thousands of megawatts of electricity are controlled by tiny electronic devices and circuits.
- 8. Applications in electronics: Medical services • Electronics systems are being used by Doctors and scientists in the diagnosis and treatment of various diseases. • X-rays, ECG and oscillographs are some instruments which have been used so far in medical science. • The use of electronics in medical science has grown so extremely and is useful in saving the life of mankind from a lot of sufferings.
- 9. Applications in electronics: Electric cars What kind of car do you expect to be driving 30 years from now?
- 10. Applications in electronics: Electric cars • It is likely that you will be driving a car with an engine powered with petrol. WHY?
- 11. Applications in electronics: Electric cars • Petrol is made from oil and the world’s oil supply is decreasing. At the same time, the amount of oil being used is increasing. • Petrol is becoming more expensive. • Gases released from car exhausts include carbon monoxide (poisonous gas), carbon dioxide (major cause of the green-house effect) and nitrogen oxides (lead to smog and acid).
- 12. Applications in electronics: Electric cars • One of the most attractive alternatives to the petrol-driven car is a car powered by rechargeable batteries. • Electrical energy from the batteries is used to drive a motor which turns the wheels. • The batteries can be recharged while the driver is at home or work.
- 13. Applications in electronics: Electric cars Electric cars have 3 main benefits: • Their use will reduce the demand for oil. • They do not release exhaust gas. • They are very quiet.
- 14. Applications in electronics: Electric cars Electric cars have issues: • They travel only about 160km before the batteries need recharging. A tank of petrol in most cars would allow them to travel 500-800km before refuelling. • Batteries are expensive and need replacing every few years. • They do not accelerate quickly and usually reach maximum speeds of 100km/h. • They are more expensive to buy than petrol-driven cars. • If everyone owned electric cars, power stations would need to supply more energy for recharging batteries from power points. Although air pollution in cities would be reduced, the air pollution around the power stations, if powered by coal, would be increased.
- 15. What do the images show?
- 16. What do the images show?
- 17. What do the images show?
- 18. Choice Activity Activity 1 • Draw your own futuristic car. • Use labels to demonstrate how your car will overcome the problems with petrol- fuelled cars and current electric cars. Activity 2 • Copy the questions and answer in full sentences. 1. Define electronics. 2. How is electronics used for communication? 3. How is electronics used in defence? 4. How is electronics used in medicine? 5. What are issues with cars that use petrol? 6. What are benefits with electric cars? 7. What are issues with electric cars. 8. How could cars be designed in the future to improve electric cars?