Английский язык | 10 - 11 классы
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.
During the test signals(to send) along the circuit?
During the test signals(to send) along the circuit.
Задать 10 вопросов к тексту as it is known the theory of radio receiving devices was worked out by the Russian scientist V?
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.
Переведите пожалуйста текст буду очень благодарен : The transformer A transformer cannot be called a machine for it has no moving parts?
Переведите пожалуйста текст буду очень благодарен : The transformer A transformer cannot be called a machine for it has no moving parts.
We know the transformer to be an apparatus designed for changing voltages and currents by means of magnetic induction.
A two - winding transformer is consist of two coils so arranged that the magnetic lines of force of one coil pass through the other.
Transformers is generally used only with alternating current.
The alternating current in one coil induces an e.
M. f.
In the other one because of the alternations in the value of the current in the first coil.
In order to strengthen the magnetic field passing through the coils of a transformer, a closed core of iron is generally used.
The iron provides a good path for the magnetic lines of force and nearly all the lines of force from one coil pass through the other.
An ideal transformer has no load losses.
It means that all the lines of force of one coil pass through the other, and vice versa.
However, the ordinary transformer is supposed to have no load losses.
The coil on which the current is impressed on the input side of the transformer is called the primary, while the one from which the induced current is obtained on the output side is called the secondary.
In case the secondary has more turns than the primary, the output voltage is larger than the input voltage and the transformer is called a step – up when transformer.
The secondary has fewer turns than the primary the transformer is called a step - down transformer.
If the same number of magnetic lines of force pass through two - coils, the ration of the e.
M. f.
Induced in the two coils is proportional to the ratio of the number of turns in the two coils.
In the transformer this means that the e.
M. f.
In the secondary is to e.
M. f.
In the primary as the number of turns in the secondary is to the number of turns the primary.
Помогите правильно перевести текст пожалуйстаааа и ответить на воапросы?
Помогите правильно перевести текст пожалуйстаааа и ответить на воапросы!
ELECTRIC CURRENT The electric current is a quantity of electrons flowing in a circuit per second of time.
The unit of measure for current is ampere.
If one coulomb passes a point in a circuit per second then the current strength is 1 ampere.
The symbol for current is I.
The current which flows along wires consists of moving electrons.
The electrons move along the circuit because the electromotive force drives them.
The current is directly proportional to the e.
M. f.
160 In addition to traveling through solids, however, the electric current can flow through liquids as well and even through gases.
In both cases it produces some most important effects to meet industrial requirements.
Some liquids, such as melted metals for example, conduct current without any change to themselves.
Others, called electrolytes, are found to change greatly when the current passes through them.
When the electrons flow in one direction only, the current is known to be d.
C. , that is, direct current.
The simplest source of power for the direct current is a battery, for a battery pushes the electrons in the same direction all the time (i.
E. , from the negatively charged terminal to the positively charged terminal).
The letters a.
C. stand for alternating current.
The current under consideration flows first in one direction and then in the opposite one.
The a.
C. used for power and lighting purposes is assumed to go through 50 cycles in one second.
One of the great advantages of a.
C. is the ease with which power at low voltage can be changed into an almost similar amount of power at high voltage and vice versa.
Hence, on the one hand alternating voltage is increased when it is necessary for long - distance transmission and, on the other hand, one can decrease it to meet industrial requirements as well as to operate various devices at home.
Although there are numerous cases when d.
C. is required, at least 90 per cent of electrical energy to be generated at present is a.
C. In fact, it finds wide application for lighting, heating, industrial, and some other purposes = 1650.
Answer the questions : 1.
What is the electric current?
2. Do melted metals conduct current without any change to themselves?
3. Can alternating voltage be changed to operate various devices at home?
4. Does a battery push the electrons in the same direction?
5. What is the alternating current used for?
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 /.
Выделите конструкции с неличной формой глагола :1?
Выделите конструкции с неличной формой глагола :
1.
The impression of bar codes on letters is considered to be of the basic methods of achieving mechanization in the post service.
2. The load is resonant circuit tuned to the frequency of the signal applied to the input of the stage, this resonant circuit being either a single tuned circuit or a band - pass filter.
3. Radio frequency amplifiers in which single - tuned circuit serve as a load are known to be tuned amplifier.
4. Visual communication allows misunderstandings to be instantly corrected.
Запишите предложения, подчеркните глагол, определите его видовременную форму, переведите предложения на русский язык?
Запишите предложения, подчеркните глагол, определите его видовременную форму, переведите предложения на русский язык.
1. When electric energy is produced at the power station, it is to the transmitted over electric wires to theе consumer.
2. Wire conductors offer resistance to the current flow ; the longer thе wire, the greater is its resistance to the current flow.
3. Accordingly, the higher the offered resistance ; the greater are the heating losses in the wire.
4. Тhе strength of current depends on both the voltage and the resis¬tance in а circuit.
5. А current of 50 mА is dangerous for а man and а current of 100 mА and higher is lethal.
Может кто знает правильное произношение на руском языке текст love the spring season when the sun shines on the lake and the snow melts, the birds and green grass, I love spring?
Может кто знает правильное произношение на руском языке текст love the spring season when the sun shines on the lake and the snow melts, the birds and green grass, I love spring.
Решите задание по английски, используя теорему Ома5?
Решите задание по английски, используя теорему Ома
5.
Solve these problems :
1.
How much is the current in the circuit if a 60 - volt source is connected to a resistance of 1, 600 ohms?
2. How much is the voltage in a circuit having a current equal to 25 amp, if a 25 - ohm resistance is connected to it?
3. A 70.
35 - ohm resistance is connected to the circuit.
How much is the voltage if the current equals 4.
5 amp?
Английский, помогите с переводом)The heart is an inner hollow muscular organ placed within the chest and included in the pericardium?
Английский, помогите с переводом)
The heart is an inner hollow muscular organ placed within the chest and included in the pericardium.
The base of the heart is against the third rib.
Its apex is against the interspace between the fifth and sixth costal cartilages.
The weight of the heart is about 300 grams (gr) in the male and about 220 gr in the female.
The heart consists of two separate chambers divided by the septum.
Each of the chambers has two connected parts : the atrium and the ventricle.
The atrioventricular valves separate the atria from the ventricles.
The right atrium is larger than the left one, but the walls of the left atrium are thicker than those of the right one.
The right ventricle is triangular (треугольный) in form and has thick walls.
The right ventricle is in the anterior part of the heart.
The left ventricle is longer and more conical than the right one.
The walls of the left ventricle are three times as thick as the walls of the right one.
The valves are located at the entrance and exit (выход) of each ventricle.
The muscular structure of the heart consists of fibrous bands divided into two groups — the first ones are the fibrous bands of the atria and the second ones are the fibrous bands of the ventricles.
The vascular system consists of three groups of vessels — arteries, veins and capillaries.
The vessels carrying blood to and from the tissues of the body compose the general system.
They are called the systemic vessels.
The pulmonary system is formed by the vessels carrying blood to and from the lungs.
The portal system is formed by the veins passing to the liver.
Most of the arteries are composed of three coats.
The arteries dilate and contract
simultaneously with the action of the heart.
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Электромагнитное реле
Электромагнитные устройства, называемые реле, широко используются в различных отраслях промышленности.
Основными частями реле являются электромагнит, пружина и арматура.
Когда ток начинает течь в обмотке электромагнита, якорь движется и пружина замыкает контакты.
Первичная цепь реле - это цепь электромагнита, а вторичная цепь - цепь, замкнутая контактами.
Когда в первичной цепи реле нет тока, пружина тянет якорь, и контакты размыкаются.
На рис.
18 показано, как реле используется для управления работой электродвигателя.
Реле находится рядом с двигателем, который подключен к его вторичной цепи.
Якорь замыкает контакты вторичной цепи, и двигатель начинает работать ; он остановится, когда реле разомкнется.
Без реле проводники с большим поперечным сечением должны были бы быть подведены к двигателю.
Это было бы очень неэкономично.
Ток в реле в десятки и даже тысячи раз меньше, чем ток, используемый для питания двигателя.
Поэтому соединительные провода могут иметь небольшие поперечные сечения.