Презентация для онлайн занятий по английскому языку для студентов СПО по теме Capacitors

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  Capacitors
  Выполнил: Морозова И.В., преподаватель КГА ПОУ «Энергетический колледж»
  

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  Vocabulary
  Various types of capacitors
  

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  Capacitors
  A capacitor is one of the main elements of a circuit. It is used to store electric energy. A capacitor stores electric energy provided that a voltage source is applied to it.
  The main parts of a capacitor are metal plates and insulators. The function of insulators is to isolate the metal plates and in this way to prevent a short.
  In the diagram one can see two common types of capacitors in use nowadays: a fixed capacitor and a variable one. The plates of a fixed capacitor cannot be moved; for this reason its capacity does not change. The plates of a variable capacitor move; its capacity changes. The greater the distance between the plates, the less is thecapacity of a capacitor. Variable capacitors are commonly used by radiomen; their function is to vary the frequency in the circuit. Fixed capacitors are used in telephone and radio work.
  4.Read the text and translate
  

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  Fixed capacitors have insulators produced of paper, ceramics and other materials; variable capacitors have air insulators. Paper capacitors are commonly used in radio and electronics; their advantage is their high capacity: it may be higher than 1,000 picofarad.
  Besides, electrolyte capacitors are highly in use. They also have a very high capacity: it varies from 0.5 to 2,000 microfarad. Their disadvantage is that they change their capacity when the temperature changes. They can operate without a change only at temperatures not lower than -40° C.
  Common troubles in capacitors are an open and a short. A capacitor stops operating and does not store energy in case it has a trouble. A capacitor with a trouble should be substituted by a new one.
  

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  5.Answer the questions
  1. What is a capacitor used for?
  2. What are the main parts of a capacitor?
  3. What is the function of insulators?
  4. What does the capacity of a capacitor depend on?
  5. What is the difference between a fixed capacitor and a variable one?
  6. What should be done in order to change a capacitor?
  7. What is the relation between the value of capacity and the distance of plates?
  8. What type of insulators have variable capacitors?
  9. What should be done in case a capacitor has a trouble?
  

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  A little bit from the origins of the invention of the capacitor
  In 1745, in Leiden, the German physicist Ewald Jurgen von Kleist and the Dutch physicist Peter van Muschenbroek created the first capacitor - the Leiden jar. Capacitor what is a capacitor capacity designations parameters characteristics types types of capacitors conventional graphic designations, lessons for beginners, radio amateurs The Leiden jar is the first electric capacitor invented by Dutch scientists Mushenbreck and his student Kueneus in 1745 in Leiden. In parallel and independently of them, a similar device called a "medical bank" was invented by the German scientist Kleist. The Leyden jar was a sealed glass jar filled with water, covered inside and outside with foil. A metal rod was stuck through the lid into the jar. The Leyden jar allowed accumulating and storing relatively large charges, of the order of a microcoolon. The invention of the Leiden jar stimulated the study of electricity, in particular the speed of its propagation and the electrically conductive properties of certain materials. It turned out that metals and water are the best conductors of electricity. Thanks to the Leiden bank, it was possible to obtain an electric spark artificially for the first time.
  6. Homework
  Read the text and make a plan of this text