Write these words as numbers

three and five sixths.........................

ninety-three per cent.........................

a thousand and nine.........................

one thousand seven hundred.........................

eighteen hundred.........................

 

Read the text and find in it the answers to the question that follows it

 

Voltage Values

Voltages up to about 250 V are called low. The common electric lightning circuit operates either at about 127 or 200 V, and the voltage used on the main circuit of large houses is usually the same. One can get an electric shock, when one touches an uninsolated wire of such a circuit.

Voltages above 250 V are high voltages. They are used in industry. Medium-powered motors are usually operated at 380 V. Large motors are supplied by voltages of from about 500 up to 6000V.

 

What have you read about?

 

 

Unit 6

 

Measurements

Saying times

We can say times in different ways:

 

British English

 

07:00 07:15 15:30

It’s seven o’clock It’s seven fifteen It’s three thirty

It’s seven It’s quarter past seven It’s half past three

 

20:45 18:10 11:55

It’s eight forty-five It’s six ten It’s eleven fifty-five

It’s quarter to nine It’s ten past six It’s five to twelve

 

American English -quarter to nine or quarter of nine; ten past six or ten after six; five to twelve or five of twelve

 

Match the times with the clock

1. It’s five to one. a) 15:00

2. It’s eight fifteen. b) 13:50

3. It’s half past four. c) 11:45

4. It’s six twenty-five. d) 20:15

5. It’s half past three. e) 16:30

6. It’s three o’clock. f) 06:25

7. It’seleven fourty-five. g) 12:05

8. It’s ten to two. h) 03:30

 

Write the times in a different way

1. It’s five to one. It’s twelve fifty-five.

2. It’s ten to five..................................

3.It’s eight fifteen.................................

4. It’s eleven thirty-five.................................

5. It’s half past one.................................

6. It’s seven o’clock................................

7. It’s six forty-five................................

8. It’s half past eleven................................

 

Read the information and write the times

1. It’s 04:30 in Berlin.New York is five hours behind Berlin. What’s the time in New York? 11:30

2. You get up at 06:45. Breakfast takes half an hour. It takes you twenty minutes to drive to work. When do you arrive at work?....................

3. Your train leaves at 09:25. The journey takes forty-five minutes. When do you arrive at the station?..................

4. It is now 14:25 and you have a meeting. It takes you five minutes to walk to the meeting. The meeting lasts an hour. Then you walk back to your office. What’s the time when you arrive back in your office?.....................

5. Your flight is at 02:30. You want to arrive at the airport one hour before the flight leaves. It takes forty-five minutes to drive to the airport. When do you have to leave home?.....................

6. You finish work at 17:30. It takes you forty minutes to drive home. Today you want to stop on the way home and go shopping for an hour. When do you arrive home?....................

 

Read the text and retell it

Time

For centuries, time has been universally measured in terms of the rotation of the earth.The second, the basic unit of time, was defined as 1/86 400 of a mean solar day or one complete rotation of the earth on its axis in relation to the sun. Scientists discovered, however, that the rotation of the earth was not constant enough to serve as the basis of the time standard. As a result, the second was redefined in 1967 in terms of the resonant frequency of the caesium atom, that is, the frequency at which this atom absorbs energy: 9,192,631,770 Hz (hertz, or cycles per second).

axis-ось

caesium-цезий

absorb-поглощать

 

 

Unit 7

 

Read the text and find in it the answers to the questions that follow it

 

Measurements

Metric system is a decimal system of physical units, named after its unit of length, the metre. The metric system is adopted as the common system of weights and measures by the majority of countries, and by all countries as the system used in scientific work.

Length

The metre had its origin in the metric system. By international agreement, the standard metre had been defined as the distance between two fine lines on a bar of platinum-iridium alloy. The 1960 conference redefined the metre as 1,650,763.73 wavelengths of the reddish-orange light emitted by the isotope krypton-86. The metre was again redefined in 1983 as the length of the path travelled by light in a vacuum during a time interval of 1/299,792,458 of a second.

Mass

When the metric system was created, the kilogram was defined as the mass of 1 cubic decimetre of pure water at the temperature of its maximum density or at 4.0 °C.

 

2.Build the sentences from the words

1. we / products / make / energy / use / we / when.

2. industry / important / are / in / metals.

3. automation / is / of / numerical / programmable / a form / control.

4. to / ancient / the / of / concept / dates back / times / robots.

5. robot / Japan / advanced / is / the most / technology / nation / exploring.

6. system / a / physical / of / units / system / metric / is / decimal.

7. has / very / safety / become / in / engineering / recent / popular / years.