4. Listen to the text once again and answer the following questions.

1. What kind of pointing device is a mouse?

2. What does a mouse consist of?

3. Does the mouse's motion typically translate into the motion of a pointer on a display?

4. What does the name mouse derive from?

5. What parts of computer mouse resemble the real one?

V. Communicative skills

Topic for discussion: In what way do scanners facilitate office work? (Use additional materials).

Unit 7 Topic: Cathode ray tube

I. Reading skills

1. Pre-reading tasks

a) You will read a text about Cathode ray tube.

• What do you know about Cathode ray tube?

• Could you name some of the devices of entering data?

b) Read and remember the following words and word combinations used in their specialized meanings.

cathode ray tube катодно-променева трубка

negatively charged cathode негативно заряджений електрод

electron gun електронна пушка

phosphor dots фосфорні точки

dot pitch розмір точки екрану

deflect відхиляти

2. Read and translate the following text into Ukrainian. Cathode ray tube

CRT Computer display pixel array (right).The CRT or cathode ray tube is the picture tube of a monitor. The back of the tube has a negatively charged cathode. The electron gun shoots electrons down the tube and onto a charged screen. The screen is coated with a pattern of phosphor dots that glow when struck by the electron stream. Each cluster of three dots, one of each color, is one pixel.

The image on the monitor's screen is usually made up from at least tens of thousands of such tiny dots glowing on command from the computer. The closer together the pixels are, the sharper the image on screen can be. The distance between pixels on a computer monitor screen is called its dot pitch and is measured in millimeters. Most monitors have a dot pitch of 0.28 mm or less.

There are two electromagnets around the collar of the tube which deflect the electron beam. The beam scans across the top of the monitor from left to right, is then blanked and moved back to the left-hand side slightly below the previous trace (on the next scan line), scans across the second line and so on until the bottom right of the screen is reached. The beam is again blanked, and moved back to the top left to start again. This process draws a complete picture, typically 50 to 100 times a second. The number of times in one second that the electron gun redraws the entire image is called the refresh rate and is measured in hertz (cycles per second). It is common in television or very early computer equipment, to use a technique called interlacing, in which all the odd-numbered lines of an image are traced, and then all the even-numbered lines; the circuitry of such an interlaced display need be capable of only half the speed of a non-interlaced display. An interlaced display, particularly at a relatively low refresh rate, can appear to some observers to flicker, and may cause eyestrain.

3. Find the answers to the questions:

1. What does the abbreviation CRT stand for?

2. How does the CRT work?

3. What is the image on the monitor's screen usually made from?

4. What technique is commonly used in television or very early computer equipment?

5. How does the electron beam move in the tube?

4. Complete the sentences.

1. The CRT or cathode ray tube is …

2. The electron gun shoots …

3. The screen is coated with …

4. The distance between pixels on a computer monitor screen is called …

5. There are two electromagnets around the collar of the tube which …

5. Match the following English words with their Ukrainian equivalents.

Аспектне відношення, редагування, точність відтворення кольору, параметри комп’ютера, відстань між точками, фосфорна точка, електронна пушка, негативно заряджений катод, відхиляти(ся), катодно-променева трубка.

6. True or false statements.

1. The back of the cathode ray tube has a positively charged anode.

2. The screen is coated with a fabric that glows when struck by the electron stream.

3. Most monitors have a dot pitch of 1 m or even more.

4. The beam scans across the top of the monitor from right to left.

5. The number of times in one second that the electron gun redraws the entire image is called the refresh rate and is measured in hertz (cycles per second).