Переведите предложения с модальными глаголами и их заменителями.
. We can measure voltage and potential difference with a voltmeter. 2. What instrument may we usein measuring current? 3. He willbe able to draw a circuit diagram. 4. They might know safety rules. 5. He lad to remember properties of metals. 6. You must_dothis work in time.
. II. Вы собираетесь строить дом. Составьте рекомендации, употребив глаголы в
повелительном наклонении:
0 make a design, to choose the right place, to work hard, not to forget about the landscape, to choose
modern building materials, to calculate money
III. Перепишите и переведите письменно предложения и словосочетания, обратите внимание
на многозначность предлогов.
I. We must try to bring the government down. 2. The new government promises to bring down prices. 3. How did you bring it off?4. Our firmis bringing out a new product. 5. There are a lot of interesting places in our town. 6. We are going<on an excursion around the town.
IV. Перепишите предложения, подчеркните инфинитив и инфинитивные обороты; переведите
предложения на русский язык.
1.1 can't for the weather to change. 2. I want you to tell me all you know about him. 3. I'llmake him tell (he truth. 4.1 saw children cross the street when the light was red. 5.1 shall be happy to do it for you. 6. She seems to know a lot about music.
V. Определите, от каких частей речи образованы выделенные слова; переведите предложения
на русский язык.
1They are quite different.2. What is the differencebetween "town" and "city"? 3. There is a lot of
violenceon TVnow. 4. Chemistryis my hobby. 5. He is a chemistby profession. 6. The weather is very
changeable this spring.
VI. Перепишите предложения, переведите их на русский язык; напишите числительные
Прописью.
1. They have 4 pairs every day. 2. He studies on the 2nd course. 3. There are 5 flowers in the vase. 4. In his garage there are 3 cars. 5, The diagram of voltaic cell is number 9. 6. Each eel! produces an emf of 1,5 volts.
VII. Прочитайте текст, переведите его письменно и составьте план.
Electrical Measuring Units and Instruments
Any instrument, which measures electrical values, is called a meter. An ammeter measures the current in
amperes. The unit is named after Andre Marie Ampere, a French scientist, who discovered a great number
of facts about electricity over a hundred years ago.
A voltmeter measures the voltage and potential difference in volts. The volt is named after Alessandro
Volta, an Italian scientist.
Two things determine the current in a conductor, the voltage across the conductor and the resistance of the
conductor. Every material object offers some resistance to the flow of an electron current through it. Good
conductors like the metals, copper, silver and aluminum offer very little resistance, while nonconductors
such as glass, wood and paper offer a very high resistance. The unit by which resistance is measured is
called the ohm. The resistance in practice is measured with ohmmeter.
A wattmeter measures electrical power in watts.
Very delicate ammeters are often used for measuring very small currents. A meter whose scale is calibrated
to read a thousandth of an ampere is called amilliammeter. One whose scale is calibrated in millionth of an
ampere is called a micro ammeter or galvanometer.
Whenever an ammeter or voltmeter is connected to a circuit to measure electric current or potential
difference the ammeter must be connected in series and the voltmeter in parallel.
As it is shown on the picture, the ammeter is so connected that the entire electron current passes through it.
To prevent a change in the electron current when such an insertion is made, all ammeters must have a low
resistance.
Most ammeters therefore have a low resistance wire, called a shunt, and connected across the armature
coil.
A voltmeter, on the other hand, is connected across that part of the circuit for which a measurement of the
potential difference is required. If the potential difference between the ends of the resistance R is wanted,
the voltmeter is connected in parallel.
Wordlist
electrical current
to measure
voltage
potential difference
conductor
resistance
electrical power
to calibrate
to connect in series (in parallel)
a shunt
электрический ток
измерять
напряжение
разность потенциалов
проводник
сопротивление
сила тока
градуировать
соединять последовательно (параллельно)
переключение
Контрольная работа № 2 Вариант № 4
|. Переведите предложения с модальными глаголами и их заменителями.
. Can you tell me the right time? 2. He was not able to get there in time. 3. I shall be able to come on Saturday. 4. May I trouble you to explain me this problem? 5. Smoking is not allowed here. 6. He must be ill.
II. Ваш друг собирается снимать квартиру у ваших знакомых. Составьте для него
рекомендации, употребив глаголы в повелительном наклонении:
to keep the flat clean, to put out light when you go out, not to smoke in the flat, to pay money in time, not to disturb neighbours by loud music, not to bring too many friends
III. Перепишите и переведите письменно предложения и словосочетания, обратите внимание
на многозначность предлогов.
1. What problems did he deal with in his report? 2. We'll have to deal with the traffic problems. 3. You should do away with lying and doing nothing. 4. The house was done up by them. 5. Our city is situated on the bank of the Tura River_6.On the other side of the river there are some low, green hills.