2. Find the correct variant.

1. The pictures reproduced

a) on the face of the tube

b) on the screen

2 The screen is covered with

a) a fluorescent material

b) a chemical material

3. The electron beam moves

a) only horizontally or vertically

b) horizontally and vertically simultaneously

4. The intensity of the beam is controlled by

a) the control grid

b) the television antenna

5. The fundamental action of the tube is

a) moving electrons

b) a reproducing a picture

3. Make up sentences, using words and word-combinations.

Circuit, resistor, voltage source, conductor, consist of, reduce, supply, connect, pass through, a short

Additional material for card № 22

1. Read the text, translate it and answer the questions

Picture-reproducing part

The picture-reproducing device is a cathode-ray tube, similar to the ordinary cathode-ray tube used in oscilloscopes. The cathode-ray tube may be called a picture tube, because the pictures are reproduced on the face of this tube. Without going into detail, we shall assume that it consists of glass envelope, a source of electrons, which are formed into a beam, a control grid for varying the intensity of the electron beam, a deflection system for deflecting the beam, and a screen. The screen is covered with a fluorescent material that emits light upon impact by the electron beam. The fundamental action of the cathode-ray tube in the reproducing a picture consists in the electron beams moving horizontally and vertically simultaneously so as to cover the whole area of the picture-tube screen.

The control grid of the picture tube controls the intensity of the beam which strikes the screen in exactly the same way that the control grid of an amplifier tube controls the plate current/

1. What are the main parts of the cathode tube?

2 Why may the cathode-ray tube be called a picture tube?

3. What is the screen covered with?

2. Find the correct variant.

1. The elements of a circuit are

1. a voltage source

2. a voltage source, a resistor, and a conductor

3. an open

2. a voltage source

1. conducts current

2. reduces current

3. supplies current

3. a conductor

1. connects the elements

2. supplies voltage

3. conducts current

4. a resistor

1. connects the elements

2. supplies the elements

3. reduces current

5. current passes through the circuit

1. if it doesn’t have an open

2. if it has an open

3. Make up sentences, using words and word-combinations.

Branch, series, parallel, main, line, use, value, in order to, the same, a circuit