Английский язык | 10 - 11 классы
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И ответить на вопросы ALTERNATING CURRENT Current is defined as increment of electrons.
The unit for measuring current was named in honor of A.
M. Ampere, the French physicist.
Thus it is called ampere.
The symbol for current is I.
The electric current is a quantity of electrons flowing in a circuit per second of time.
The electrons move along the circuit because the e.
M. f.
Drives them.
The current is directly proportional to the e.
M. f.
A steam of electrons in a circuit will develop a magnetic field around the conductor along which the electrons are moving.
The strength of the magnetic field depends upon the current strength along the conductor.
The direction of the field is dependant upon the direction of the current.
If the force causing the electron flow is indirect, the current is called direct (d.
C. ).
If the force changes its direction periodically the current is called alternative (a.
C. ).
Alternating current is the current that changes direction periodically.
The electrons leave one terminal of the power supply, flow out along the conductor, stop, and then flow back toward the same terminal.
168 A voltage that caused current reverses its polarity periodically.
This is properly called an alternating voltage.
The power supply that provides the alternating voltage actually reverses the polarity of its terminals according to a fixed periodic pattern.
A given terminal will be negative for a specific period of time and drive electrons out through the circuit.
Then, the same terminal becomes positive and attracts electrons back from the circuit.
This voltage source cannot be a battery.
It must consist of some types of rotating machinery = 1300.
[email ; protected] Answer the questions : 1.
Why do electrons move along the circuit?
2. What does the strength of the magnetic field depend upon?
3. What is alternating current?
4. What is an alternating voltage?
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ПОМОГИТЕ ПОЖАЛУЙСТА С ПЕРЕВОДОМ!
Meters Among the most common meters used there are the ohmmeter, the ammeter and the voltmeter.
The ohmmeter is used to measure the value of resistance.
It consists of a milliammeter calibrated to read in ohms, a battery and resistors.
The meter is connected in parallel and the circuit is not opened when its resistance is measured.
The readings on the scale show the measured value.
The ammeter is used to measure the value of current.
When the ammeter is used the circuit should be opened at one point and the terminals of the meter should be connected to it.
One should take into consideration that the positive terminal of the meter is connected to the positive terminal of the source ; the negative terminal - to the negative terminal of the source.
The ammeter should be connected in series.
The readings on the scale show the measured value.
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Помогите с переводом!
Пожалуйста!
Electric shock In all manual arc welding operations, the principal risk is from electric shock, most likely from contact with bare live parts of the welding circuit.
The arc voltage is within the range 10 to 40 V, but, as the voltage required to strike the arc may be substantially higher, power sources have an open circuit voltage (OCV), typically up to 80V.
Although these voltages appear low compared with the 230V domestic mains supply, work by the International Electrotechnical Commission shows that only voltages below 50V AC or 120V DC are unlikely to be dangerous to healthy people in a dry working environment.
In other conditions such as restricted conducting locations or wet surroundings, potentials of 80V AC have been the cause of fatal electric shocks.
Devices are available which reduce the open circuit voltage when welding is not being carried out.
These voltage reduction devices (VRD) should meet the requirement of BSEN 60974 - 1.
Appropriate protective clothing such as gloves, boots and overalls will protect the welder from electric shock.
Stray welding currents A different kind of electrical hazard can arise from stray welding currents which return to the welding transformer by paths other than the welding return lead.
For example, although the return is disconnected, welding is possible when the return current flows through : • protective earth (PE) conductors of other electrical equipment, or the power source itself • wire ropes, slings and chains • metal fittings and pipework • bearings in motors Damage to the PE conductor in particular could mean the equipment is no longer being earthed.
Stray currents may be substantial and comparable with the welding current level where there is poor or faulty insulation of the return lead which may be short - circuited by other conductors.
When welding on building structures and pipework installations, the welding return lead should be placed as close as possible to the point of welding.
The exception is where the metallic grid, support structure or metallic ship hull is used as part of the welding return circuit.
There is an increased risk of stray currents when welding on structures which have an inherent connection to earth such as ships or pipelines.
There could be an unacceptable indirect current return path with damage to conductors if, for example, the current return lead is detached and the circuit becomes open.
The recommendations for the electrical distribution systems and earth connections in various situations are described in HS(G) 118.
Safe practice and accident avoidance Welding equipment should conform to the appropriate standards ; electrode holders that are insulated overall are recommended so no bare metal can be inadvertently touched.
Welding leads and return leads should be insulated and thick enough to carry the current safely ; connectors should also be insulated to avoid inadvertent access to live conductors and adequate for the current being carried.
The welding return lead should be connected as near as practicable to the welding arc ; metal rails, pipes and frames should not be used as part of the welding circuit unless they are a part of the workpiece itself.
Check the workpiece earthing requirements.
When using a double or reinforced insulation power source, stray currents can be avoided by not earthing the workpiece or the welding output circuit.
The welding leads, connection devices and electrode holder or torch should be checked at regular intervals for 'fitness for use' ; repair or replace damaged or worn components.
Определить видо - временную форму глагола?
Определить видо - временную форму глагола.
1. As fusion takes place, energy is radiated out to the walls of the tube, thus heating them.
This heavy flow of current heats plasma enormously.
For this reason, great interest is being directed to methods for turning the light and heat of the sun directly - into electricity.
ПОМОГИТЕ ПОЖАЛУЙСТА Перепишите следующие предложения, содержащие разные формы сравнения, переведите их на русский язык?
ПОМОГИТЕ ПОЖАЛУЙСТА Перепишите следующие предложения, содержащие разные формы сравнения, переведите их на русский язык.
I. The greater the load, the tower is the efficiency of the line.
2. This wire is as long as that one.
3. The cost of copper is much higher.
4. The voltage in this circuit is the highest.
ПОМОГИТЕ ПОЖАЛУЙСТА?
ПОМОГИТЕ ПОЖАЛУЙСТА!
VII. Выберите правильный вариант ответа, переведите эти предложения.
1. The ammeter is a) a common meter.
B)an uncommon meter.
2. In order to measure the a) the ohmmeter is used, value of current b) the voltmeter is used.
C) the ammeter is used.
3. A meter has a) positive terminals only.
B) negative terminals only.
C) positive and negative terminals.
4. When the ammeter is used a) the circuit should be opened.
B) the circuit should not be opened.
5. The ammeter should be con - a) in series, nected b) in parallel.
6. One should take into consid - a) the positive terminal should beeration that connected to the negative terminal.
B) the positive terminal should be connected to the positive terminal of the source.
Образуйте от слов, данных в скобках, слова, соответствующие контексту?
Образуйте от слов, данных в скобках, слова, соответствующие контексту.
The current which flows along wires consists of (move) electrons.
Choose the true sentence?
Choose the true sentence.
A) The citizens of Brasilia love their city B) Brazil is the current world champion in football C) The Amazon has 5 percent of the world`s fresh water D) The Amazon gives people important medications.
Translate into russian using чем ?
Translate into russian using чем .
Тем :
1) There more one studies nature , the better one knows laws
2)The longer one learns , the more one knows
3) The higher the armosphere, the less is its pressure
4)The heavier the object , the more work one has to do in order to lift it.
5)The greater the number of free electrons is any metal , the higher is its conductivity.
Переведите текст пожалуйста POWER SUPPLY Power supply is a reference to a source of electrical power?
Переведите текст пожалуйста POWER SUPPLY Power supply is a reference to a source of electrical power.
A device or system that supplies electrical or other types of energy to an output load or group of loads is called a power supply unit or PSU.
The term is most commonly applied to electrical energy supplies, less often to mechanical ones, and rarely to others.
Power supply types Power supplies for electronic devices can be broadly divided into linear and switching power supplies.
The linear supply is a relatively simple design that becomes increasingly bulky and heavy for high current devices ; voltage regulation in a linear supply can result in low efficiency.
A switched - mode supply of the same rating as a linear supply will be smaller, is usually more efficient, but will be more complex.
Circuit Breakers One benefit of using a circuit breaker as opposed to a fuse is that it can simply be reset instead of having to constantly replace the blown fuse.
A circuit breaker works once an overloaded current causes some element to heat and trigger a spring which shuts the circuit down.
Once the element cools, and the problem is identified the breaker can be reset and the power restored.
Power conversion The term "power supply" is sometimes restricted to those devices that convert some other form of energy into electricity (such as solar power and fuel cells and generators).
A more accurate term for devices that convert one form of electric power into another form (such as transformers and linear regulators) is power converter.
The most common conversion is AC - DC.
This is a conversion from the household current AC, to the direct current that is used in your car, and most electronics.
Fuses A piece of wire is connected between two metal ends.
The two metal ends of the fuse are connected by either a tube of glass or plastic which surrounds the wire.
If too much current flows, the wire overheats and melts.
This interrupts the power supply, and the equipment stops working until the problem that caused the overload is identified and the fuse is replaced.
There are two types of fuses, slow - blow and fast - blow.
In a fast - blow fuse, the wire inside the fuse will melt if the current exceeds the rated current, even if it is just for a fraction of second.
This concise process is important in electronic equipment where even a small spike in the current could damage the equipment.
A slow - blow fuse is designed to only melt when there is a continuous overload.
Slow - blow fuses are ideal for motor systems.
Go (towards the?
Go (towards the.
(along the.
(past the.
(into the.
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ПЕРЕМЕННЫЙ ТОК
Ток определяется как приращение электронов.
Устройство для измерения
тока был назван в честь А.
М. Ампера, французского физика.
Поэтому он и называется ампер.
Символ для тока И.
Электрическая
ток - это количество электронов, протекающий в цепи за одну секунду
время.
Электроны движутся вдоль цепи, потому что электронная.
М. Ф.
Диски
их.
Тока прямо пропорциональна е.
М. Ф.
Пара электронов в контуре будет развиваться магнитного поля
вокруг проводника, по которому электроны движутся.
Сила магнитного поля зависит от силы тока
вдоль проводника.
Направление поля зависит от
направление тока.
Если сила, вызывающая поток электронов является косвенным, ток
называемого прямого (ум.
В. ).
Если сила изменяет свое направление периодически
тока называется альтернативной (а.
В. ).
Переменный ток - это ток, который периодически меняет направление.
Электроны покидают одну клемму источника питания, вытекать вместе
проводник, остановить, а затем поток обратно в сторону того же терминала.
168
Напряжение, которое вызвало ток периодически меняет свою полярность.
Это
правильно называется переменное напряжение.
Источник питания, который обеспечивает
переменное напряжение на самом деле меняет полярность его клемм
по данным фиксированный периодический узор.
Данный терминал будет отрицательным
в течение определенного периода времени и электроны привод через цепь.
Затем, тот же терминал становится положительным и притягивает электроны обратно
от цепи.
Этот источник напряжения может быть батарея.
Он должен состоять
некоторых типов вращающегося оборудования = 1300.
[email ; protected]
Ответить на вопросы :
1.
Почему электроны движутся вдоль цепи?
2. Какова сила магнитного поля зависит?
3. Что такое переменный ток?
4. Что такое переменное напряжение?