Английский язык | 10 - 11 классы
Задать 10 вопросов к тексту as it is known the theory of radio receiving devices was worked out by the Russian scientist V.
Siforov.
But it is A.
Popov who invented and demonstrated the first radio receiving set.
Since that time radio devices have been improving and perfecting.
The receiver performs the function of converting the current in the receiving antenna into the intelligence contained in the transmission.
The main parameters of radio receivers are sensitivity, selectivity and fidelity.
Sensitivity is a measure of the receiver's ability to receive weak signals, as it is known that the farther an electromagnetic wave travels, the weaker is its energy.
Selectivity is the ability of the receiver to reject undesirable signals.
Fidelity is a measure of the receiver's ability to reproduce clearly audio - frequency currents, which are in accordance with the modulation envelope of the received signals.
However simple the radio receiver may be, it includes an antenna, an input tuning circuit, a detector and a pair of earphones.
The principle of operation of the radio receiver is not very difficult understand.
The electromotive force is impressed upon the receiving antenna and produces a current, this current is a reproduction of the current of the transmitting antenna.
There are various types of receivers, communication and broadcast receivers being the principal types of them.
Communication receivers are used in radio telephone and telegraph service, broadcast receivers finding application for the reception of sound and visual programms.
Wherever radio receivers were applied, they must meet an important requirement as reliability in operation.
Помогите хоть чуток Write out the professional terminology from the text?
Помогите хоть чуток Write out the professional terminology from the text.
Computers are electronic machines which can accept data in a certain form, process the data and give the results of the processing in a specified format as information.
Three basic steps are involved in the process.
First, data are fed into the computer’s memory.
Then, when the program is run, the computer performs a set of instructions and processes the data.
Finally, we can see the results (the output) on the screen or in printed form.
Information in the form of data and programs is known as software, and the electronic and mechanical parts that make up a computer system are called hardware.
A standard computer system consists of three main sections : the central processing unit (CPU), the main memory and the peripherals.
Perhaps the most influential component is the central processing unit.
Its function is to execute program instructions and coordinate the activities of all the other units.
In a way, it is the ‘brain’ of the computer.
The main memory holds the instructions and data which are currently being processed by the CPU.
The peripherals are the physical units attached to the computer.
They include storage devices and input / output devices.
Storage devices (floppy, hard or optical disks) provide a permanent storage of both data and programs.
Disk drives are used to handle one or more floppy disks.
Input devices enable data to go into the computer’s memory.
The most common input devices are the mouse and the keyboard.
Output devices enable us to extract the finished product from the system.
For example, the computer shows the output on the monitor or prints the results onto paper by means of a printer.
On the rear panel of the computer there are several ports into which we can plug a wide range of peripherals – modems, fax machines, optical drives and scanners.
These are the main physical units of a computer system, generally known as the configuration.
Use the appropriate forms of the verbs on the right to complete the text?
Use the appropriate forms of the verbs on the right to complete the text.
The movie and sound - recording changed popular entertainment in the previous century as they 1)(allow) performances to be reproduced over and over again.
But there 2)(be) still another revolution to come.
Today we call it broadcasting, and it 3)(bring) entertainment from public places into the home.
The telegraph was the first invention that allowed transmission of information over long distances, the telephone allowed transmission of voices by wire.
Then the radio 4)(appear).
At first only code signals 5)(send) and6) (receive), but soon voice communication 7)(become) also possible.
Between 1920 and 1927 several million radio receivers 8)(sell) , and radio stations 9)(spring) up in many countries, Radio's golden age 10)(run) from 1927 to about 1950 , the same years as the golden age of movies.
Radio programmes 11)(pay) for by sponsors, who 12)(advertise) their goods.
They hoped that listeners 13)(respond) by buying their products.
Помогите?
Помогите!
Можно перевод текста .
Очень срочнооо.
За ранее большое спасибо) Electromagnetic Relay
Electromagnetic devices called relays are widely used in various
branches of industry.
The main parts of а relay are an electromagnet, а spring and аn ar
mature.
When а current starts flowing in the electromagnet winding, the
armature moves and the spring closes the contacts.
The primary circuit
of а relay is its electromagnet circuit and the secondary circuit is the
оne closed bу the contacts.
When there is по current in the relay's primary circuit, the spring
puHs the armature and the contacts оpen.
Fig. 18 shows how а relay is used to control the work of an electric
motor.
The relay is placed close to the motor which is connected to its
secondary circuit.
The armature closes the contacts of the secondary
circuit, and the motor starts operating ; it will stop when the relay opens.
Without а relay, conductors with а large crosssection would have to
be brought to the motor.
This would be very uneconomical.
The current in а relay is tens and even thousands of times smaller than that used to
power the motor.
Therefore, the connecting wires сan have small cross
sections.
СОКРАТИТЕ ПОЖАЛУЙСТА : The radio stations entertain the students by playing all the latest music and chart hits?
СОКРАТИТЕ ПОЖАЛУЙСТА : The radio stations entertain the students by playing all the latest music and chart hits.
They also review bands, films and new CDs among other things.
On a more serious note, the radio station informs the students about all the news on campus and in the local area.
A radio station needs several people to run smoothly.
Firstly, there's a DJ who presents the show and plays the music.
There is a journalist who writes and then reads the news.
A technician or engineer is always nearby in case the equipment breaks down.
Lastly, the producer organises everything and controls the show.
Working for the radio station is good for the students involved.
They gain useful practical experience that may help them find a job in the future.
Переведите пожалуйста без переводчика?
Переведите пожалуйста без переводчика!
The United States of America is the 4th largest country in the world after Russia, Canada and China.
It lies in the central part of the North American Continent between the two oceans : the Atlantic Ocean in the East and the Pacific Ocean in the West.
Canada in the North and Mexico in the South are the only countries that have borders with the USA.
The total area of the USA is about 9 million square kilometres.
The country is washed by 3 oceans : The Arctic, the Atlantic and the Pacific.
The country has many lakes, including the Great Lakes and many rivers, the longest of which are the Mississippi, the Missouri, the Columbia and others.
The highest mountains are the Rocky Mountains, the Appalachian, the Cordillera and the Sierra Nevada.
The highest peak, Mount McKinley, is in Alaska.
The climate conditions are rather various.
The country is rich in natural and mineral resources : oil, gas, iron ore, coal and various metals.
The USA is a highly developed industrial and agricultural country.
The main industrial branches are aircraft, rocket, automobile, electronics, radio engineering and others.
Nowadays the USA is one of the leading powers of the world due to its economic, political and military influence.
The United States of America is a federal state and a parliamentary republic, headed by the President.
According to the US Constitution the powers of the Government are divided into 3 branches : legislative (the Congress), executive (the President), and judicial (the Supreme Court).
The Congress has two houses — the Senate and the House of Representatives.
The Supreme Court is the highest court in the country.
There are two main political parties in the United States : the Democratic Party (their symbol is a donkey), and the Republican Party (their symbol is an elephant).
The president is elected for a 4 - year term and not more than two times.
The electric current intensity to find the third conductor resistivity and the first and second ends of the conductors?
The electric current intensity to find the third conductor resistivity and the first and second ends of the conductors.
/ проверьте пожалуйста состав предложение /.
Используйте правильную форму прошедшего простой пассивный или настоящего совершенного пассивного?
Используйте правильную форму прошедшего простой пассивный или настоящего совершенного пассивного.
The radio.
(invent)at the beginning of the 20th century .
In the First World War , radios .
(use)to communicate with soldiers.
Since the 1960s, many radio signals.
(send)into outer spaces.
So far, no answers.
(receive)from other planets.
It's possible that the signals have arrived on other planets, but the messages .
(not understand ).
Сделайте объектные или в личные местоимения1) Is Emma reding the newspaper?
Сделайте объектные или в личные местоимения
1) Is Emma reding the newspaper?
2) The children are playing with the ball.
3) Do not touch the wires.
4) Mother is talking to Simon
5) Are Peter and Tom listening to the radio?
Нужно составить вопросы?
Нужно составить вопросы.
The telephone and the telegraph are means of communication.
They will use the radio to announce the winners of the competition В пассивный залог?
They will use the radio to announce the winners of the competition В пассивный залог.
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1 Who worked out the theory of radio receiving devices?
2 What did A.
Popov invent?
3 How did the invention affect radio devices?
4 What are the main parameters of radio receivers?
5 Does sensitivity mean a measure of the receiver's ability to receive weak signals?
6 Which parameter means the ability of the receiver to reject undesirable signals?
7 What does fidelity mean?
8 The principle of operation of the radio receiver is not very difficult understand, is it?
9 Are there various types of receivers?
10 Where are used communication receivers?
11 Are broadcast receivers used in radio, telephone and telegraph service or in sound and visual programms?