Английский язык | 10 - 11 классы
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?
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?
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.
Помогите перевести текст пожалуйста ?
Помогите перевести текст пожалуйста .
WHAT IS AN ELECTRIC CURRENT?
The question is often asked : "What is an electric current?
" No one has ever seen it.
We only know of the existence of a current owing to its effects.
A current can heat a conductor, it can have a chemical action when passing through a solution, or it can produce a magnetic effect.
We can measure currents by observing their heating, chemical or magnetic effects.
The practical unit of current is called the Ampere.
Two things are necessary to cause an electric current to flow : first - a complete circuit, and second - a driving force called the electromotive force (e.
M. f.
). If you put free electrons on an insulated copper ball, what would they do?
In this case they would try to repel each other.
In case you connected this charged ball to another ball of equal size by a copper wire, what would be the result?
The electrons would move along the copper wire until the numbers of electrons on each ball were the same.
This is an example of electromotive force causing a current to flow.
A battery has a surplus of electrons on one of its two plates ; so you say that a battery furnishes an e.
M. f.
If a copper wire is run from one plate to the other, а current flows in the complete circuit thus made.
If a small bulb is placed in the circuit, it will light up, giving evidence to a current flow.
If the battery were disconnected and a generator substituted for it, we should have a typical lighting system.
Both batteries and generators are the most common sources of electromotive force.
The practical unit of e.
M. f.
Is the Volt.
Currents will flow more readily in some substances than in others, that is, various substances offer lesser or greater resistance to the flow of current.
Such substances as porcelain, ebonite, rubber, glass and the like having extremely high resistance are known as insulators.
The practical unit of resistance is the Ohm.
Substances whose properties lie between those of conductors and insulators are called semiconductors.
Let us name but a few most widely used at present, they are germanium, silicon, selenium and copper oxide.
The importance of semiconductors in our life cannot be overestimated.
But for these tiny "workhorses" electronic industry would not have achieved such a great progress.
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 /.
Помогите перевести текст пожалуйста ?
Помогите перевести текст пожалуйста .
WHAT IS AN ELECTRIC CURRENT?
The question is often asked : "What is an electric current?
" No one has ever seen it.
We only know of the existence of a current owing to its effects.
A current can heat a conductor, it can have a chemical action when passing through a solution, or it can produce a magnetic effect.
We can measure currents by observing their heating, chemical or magnetic effects.
The practical unit of current is called the Ampere.
Two things are necessary to cause an electric current to flow : first - a complete circuit, and second - a driving force called the electromotive force (e.
M. f.
). If you put free electrons on an insulated copper ball, what would they do?
In this case they would try to repel each other.
In case you connected this charged ball to another ball of equal size by a copper wire, what would be the result?
The electrons would move along the copper wire until the numbers of electrons on each ball were the same.
This is an example of electromotive force causing a current to flow.
A battery has a surplus of electrons on one of its two plates ; so you say that a battery furnishes an e.
M. f.
If a copper wire is run from one plate to the other, а current flows in the complete circuit thus made.
If a small bulb is placed in the circuit, it will light up, giving evidence to a current flow.
If the battery were disconnected and a generator substituted for it, we should have a typical lighting system.
Both batteries and generators are the most common sources of electromotive force.
The practical unit of e.
M. f.
Is the Volt.
Currents will flow more readily in some substances than in others, that is, various substances offer lesser or greater resistance to the flow of current.
Such substances as porcelain, ebonite, rubber, glass and the like having extremely high resistance are known as insulators.
The practical unit of resistance is the Ohm.
Substances whose properties lie between those of conductors and insulators are called semiconductors.
Let us name but a few most widely used at present, they are germanium, silicon, selenium and copper oxide.
The importance of semiconductors in our life cannot be overestimated.
But for these tiny "workhorses" electronic industry would not have achieved such a great progress.
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.
Перевести предложение : There is taboo truss lying as a border at the memorial building as a symbol of interrupted time in the flow of current life?
Перевести предложение : There is taboo truss lying as a border at the memorial building as a symbol of interrupted time in the flow of current life.
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?
A short circuit occurs when a zero resistance between two points on a wire shortens the path of electron flow?
A short circuit occurs when a zero resistance between two points on a wire shortens the path of electron flow.
This usually results when the insulating material, the rubber or plastic covering the wire, has worn away so that two bare pieces of wire come into contact wih each other.
The current is simply following the path of least resistance.
When a circuit overloads or shorts out.
There is a hazard of fire.
To prevent it, safety devices like fuses or circuit breakers must be built into the system.
There are two kinds of current flow, direct current, usuaalyy abbreviated dc, and alternating current, usually abbreviated ac.
In direct current, the flow of electrons is reversed rapidly over and over again.
This is called electromagnetism.
When Thomas Eison built the first genetating station in New York in 1882, e supplied direct current for his system.
After a long and bitter struggle, however, alternating current came into general use.
Today it is used almost exclusively for homes and industry.
The main advantage of alternating current is thet there is less energy loss when current is transmitted over long distances.
1. Write out from the text threee sentences in Passive Voice and write down them in Active
2.
Write down four kinds of questions for the next sentences
The main advantage of alternating current is thet there is less energy loss when current is transmitted over long distances.
3. Write out from the text four adjectives and write down the degrees of comparison.
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ЭЛЕКТРИЧЕСКИЙ ТОК
Электрический ток — это количество электронов, протекающих в цепи за секунду.
Единицей измерения тока является ампер.
Если за каждую секунду через точку в цепи проходит один кулон, то сила тока составляет 1 ампер.
Символом тока является I.
Ток, который течет по проводам, состоит из движущихся электронов.
Электроны движутся по цепи, потому что их приводит в движение электродвижущая сила (ЭДС).
Ток прямо пропорционален ЭДС.
Однако, помимо прохождения через твердые частицы, электрический ток может протекать и через жидкости, и даже через газы.
В обоих случаях это имеет важное значение для удовлетворения потребностей промышленности.
Некоторые жидкости, например расплавленные металлы, проводят ток без каких - либо изменений для себя.
А другие, называемые электролитами, сильно изменяются при прохождении через них тока.
Когда электроны текут только в одном направлении, ток, как известно, является постоянным, обозначаемым буквами DC.
Простейшим источником постоянного тока является батарея, поскольку батарея все время толкает электроны в одном и том же направлении (то есть от отрицательно заряженной клеммы к положительно заряженной).
Буквы «AC» обозначают переменный ток.
Рассматриваемый ток течет сначала в одном направлении, а затем в противоположном.
Предполагается, что переменный ток, используемый для питания и освещения, проходит 50 циклов за одну секунду.
Одним из больших преимуществ переменного тока является легкость, с которой мощность при низком напряжении может быть преобразована в почти аналогичное количество мощности при высоком напряжении и наоборот.
Следовательно, с одной стороны, переменное напряжение увеличивается, когда это необходимо для передачи на большие расстояния, а с другой стороны, его можно уменьшить, чтобы удовлетворить промышленные требования, а также использовать различные устройства в домашних условиях.
Хотя существует множество случаев, когда требуется постоянный ток, по крайней мере 90 процентов электрической энергии, которая генерируется в настоящее время, является переменным током.
На самом деле, он находит широкое применение для освещения, отопления, промышленности и некоторых других целей.
Ответы на вопросы : 1.
The electric current is a quantity of electrons flowing in a circuit per second of time.
2. Yes, they do.
Melted metals conduct current without any change to themselves.
3. Yes, it can.
4. Yes, it does.
A battery pushes the electrons in the same direction all the time.
5. The alternating current is used for lighting, heating, industrial, and some other purposes.