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Vacuum triode.

Language practice.

1. Answer the following questions.

  1. What is the diode used for?

  2. What is the function of the additional electrode, the grid, in the vacuum triode?

  3. Which devices of mentioned above are used for rectification of a direct current into alternating one?

  4. What kinds of rectifying circuits with transistors or vacuum tubes do you know?

  5. Do vacuum tubes have any advantages over transistors?

  6. Are transistors more reliable than vacuum tubes?

  7. What adjectives can be used with the noun “tube”?

2. Decide whether the following statements are true or false in relation to the information in the text in task 1. If you think the statement is false, change to make it true.

    1. Any vacuum tube has at least three electrodes.

    2. The electric current in the vacuum tube is a flow of positively charged ions.

    3. The greed in a vacuum tube needs to be heated.

    4. In certain condition the greed and the plate can emit electrons by themselves.

    5. The intercity of electron stream in the vacuum tube always depend on voltage between the cathode and plate.

    6. Transistors usually consume more power than vacuum tubes.

    7. Nowadays most of people have never seen any vacuum tube.

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