Opir of the copper conductor. Opir of the medny drotu
When designing electrical tethers at apartments in private booths, the wires and cables are cut. To carry out the calculation of victories, there are such signs, as the meaning of tightness, which is calming down, and the strength of the stream, as if you will pass along the measure. Opir is not taken to respect through a small length cable lines. However, this indicator is necessary for the great old LEP and voltage fluctuations on different plots. Of special significance may opir honey dart. Such darts are more and more often vikoristovuyutsya in modern merezhakh, to that it is the physical power of the obov'yazkovuvatsya in the design.
Understanding that meaning of support
The electrical opir of materials is widely recognized and insured in electrical engineering. This value allows you to set the main parameters of the wires and cables, especially when the cable is wired. We are being installed in front of the exact line of the laid line and material, vikoristany for carrying out the drone. Calculate the amount of data, as much as possible for the cable.
Porіvnjano іz zvichaynoy elektrichnoy wiring, in elektronіtsі parameters support is supposed to be of paramount importance. It is looked at and put together with other signs present in electronic circuits. In these cases, incorrectly picking up an opir drotu can result in a failure in the robots of all elements of the system. Tse mozhe statisya, as for connecting to the block of life of the computer, it must be speeded up with a too thin dart. There will be an insignificant decrease in the voltage of the conductor, which will cause incorrect computer operation.
Opir at the middle dart to lay rich chinnikiv, and at the first black in the physical authorities of the material itself. In addition, the diameter is guaranteed or the diameter of the conductor, as it is determined by the formula or by a special table.
table
Opir copper conductor add a sprat of additional physical quantities. The temperature can be reversed dovkilla. Everyone knows that when the temperature of the conductor increases, the support grows. At the same time, a decrease in the strength of the struma is observed due to the reversed proportionate fallow of both values. It is important to consider metals with a positive temperature coefficient. The butt of the negative coefficient is tungsten metal, which is stuck in the heating lamps. In this alloy, the strength of the struma does not decrease to strike for an arc of high heating.
How to unravel opir
For rozrakhunkiv, the support of the copper dart is a sprat of methods. To the simplest, there is a tabular option, de showing mutually dependent parameters. To that, crim support, the strength of the strum, the diameter of which crossed the dart, is recognized.
Another type of vikoristovuyutsya rіznomanіtnі. In the skins of them, a set of physical values of the copper core is inserted, with the help of which accurate results are obtained. Most of the similar calculators have an opir midi size of 0.0172 Ohm * mm 2 /m. In some cases, such an average value can affect the accuracy of the calculation.
The most collapsible option is to use manual calculations for different formulas: R = p x L/S, in yakіy p - petomy opіr midi, L - conductor's length and S - pererіz of that conductor. Slid designate, scho opіr mid drutu table vyznaє as one of the lowest. The lower values may be less likely.
If there will be a smaller value, the style will once again decrease opir conductor.
As such, it is possible to change the dozhina of the conductor, who wins in lance. Opіr is directly proportional to the dovzhinі of the conductor. If you shorten the conductor n times, then opir decrease at the style of the times.
Increase the area of the cross section of the conductor. Install a guide with a large cross-beam or connect a sprat of guides in parallel to a bunch of darts. The area of the transverse cross section of the conductor will increase for some times, the area of the cross section of the conductor will decrease, for the style of times it will decrease opir conductor.
You can combine these methods. For example, to reduce opir guide 16 times, replace yoga guide, pet opir in 2 times it is less, it is changed in 2 times of the yogo dozhina, and the area of the transverse cut is in 4 times.
Schob change opir at the distance of the lansyug, come to the new one in parallel opir open the size of which. Insure that with a parallel connection, opir lantsyug's lantsyug zavzhd less than the smallest support, shcho at parallel gіlkah. Pay off your needs opir, which is necessary to arrive in parallel. For whom do you live opir lantsyug R1. Choose those opir, yak maє buti on new - R. opir R2, which is necessary to reach the support R1 in parallel. For which you need to know additional supports R and R1 and add to the retail R1 and R (R2 = R R1 / (R1 - R)). Protect, scho behind the mind R1, get more R.
Opir- for the sake of building the element electric lansyug cross over him electric struma. Їm Volodiyut different materials, for example, mid, gold and nichrome. Zagalny opіr - tse opіr of the whole electric lansyug with a flame. It will win in ohms. It is necessary to know the opir of the lancer for the assessment of strums short hum and choice of switching devices.
you need
- Ohmmeter, vimiryuvalny mist, calculator.
Instruction
On the back of the head, like the connection of the elements of the electric lansyug by extension one to one, the shards are poured into the fireworks of the fire support. Explorers can be listed in the last line parallel connection. The last connection is the same connection, if all the elements are connected in such a way that the station of the lancer, which includes them, does not have a single knot, but parallel to the connection - the same is the connection, if all the elements of the lance Use two nodes and do not make connections with other nodes.
As you have indicated that the conductors in the electrical lan- cue are connected in series, it is difficult to know the latest opir. Just store the supports of all the elements. Even if you were not given an opir of a skin conductor, but you were given their strength and the strength of the struma of any element of the lance, then, having combined all the tensions, you recognize hot voltage. Strength of the struma of the skin element at last day Rіvnі, that's why the power of the strum is strong for all lancers, the strength of the strum is like a guide for this lancer. I then, in order to know the latest opir, to divide the total tension of the struma.
If the elements are connected in parallel, then the main opir can be known offensive way: multiply the supports of all conductors and divide their sum. If you are not given the support of the skin element, but given the strength of the strum and the strength of the lancet element, then, having combined all the forces of the strum, you will recognize the strum. The tension of the skin element with a parallel z'єdnanny rіvnі, so the total voltage of the whole lancet is more than the voltage of any conductor of this lansy. I then, in order to know the latest opir, to add tension to the struma's gale force.
To designate a sparkling opir of an electric lance, hurry up with such vimіryuvalnye attachments, like an ohmmeter and vimіryuvalny mist. The stench will help you design electrical active supports.
Obov'yazkovo choose the way of connecting the elements in the electric lance, the shards of the same way to lay the right pidrakhunok of the fire support!
Jerela:
- rozrahuvat opіr lansyug y 2017
Opir droti showing how many faults are passing through the electric jet. Use yoga for the help of the tester, which switches to the robotic ohmmeter mode. Since there is no such possibility, you can develop yoga different ways.
you need
- - Tester;
- - Line or roulette;
- - Calculator.
Instruction
Win Opir droti. For this last time, come the tester, turn it on to the robotic ohmmeter mode. An electric opir will appear on the screen droti in ohms or multiples of them, fallow in installations priladu. The provision for this is to blame for the inclusions in the dzherel struma.
Restore the opir for the help of a tester, which works in the ammeter and voltmeter modes. Yakshcho provіd є dіlyankoy elektrichnoy kol, podklyuchіt yogo to zherel struma. Until the end droti At the same time, turn on the tester, turn on the robotic voltmeter mode. Measure the voltage drop on the rod at volts.
Switch the tester to the robotic ammeter mode and turn it into a loop in sequence. Subtract the struma power value in lances in amps. Vikoristovuyuchi spіvvіdnoshennia, otrimane іz Ohm's law, know electric opir conductor. To add the value of the voltage U to the force of the struma I, R=U/I.
butt. Vimiryuvannya showed that when the voltage drops on the conductor 24 V, the force of the struma in the new becomes 1.2 A. Find out the voltage range to the strength of the struma R=24/1.2=20 Ohm.
Find Opir droti do not connect yoga to the strum dzherel. Find out, from what material the inspection was made. In the special tables, find out the details of the reference material Ohm∙mm2/m.
Unravel the peratin droti yakscho won't be put on the back. For which clean the type of insulation, as well as the insulation, and measure the diameter of the strum-conducting wire in mm. Designate the її radius by adding the diameter to the number 2. Designate the transition droti, multiplying the number π≈3.14 by the square of the radius lived.
For the help of a line or a roulette, win the dozhina droti at meters. Pay for the opir droti, having multiplied the number of reference material by the length of the explorer l. Submit the result to yogo perepiz S, R=ρ∙l/S.
butt. Find Opir Midny droti with a diameter of 0.4 mm of the zavdovka 100 m. Radius droti good 0.4/2 = 0.2 mm. Cross section S=3.14∙0.2²=0.1256 mm². Expand the opir according to the formula R \u003d 0.0175 ∙ 100 / 0.1256 ≈ 14 Ohm.
Jerela:
- opir of the medny drotu
If you close the electric lance, having created a difference in potentials on yoga, then in a new way you can beat the electric stream, the strength of which can be measured with an ammeter. Ale tsya power of variability, as if in lanciug replace one conductor with another. It’s not worth talking about those that don’t only put pressure on the strength of the struma, but the material, from which the conductor prepares. The axis of authority of the conductor to cross the passage of the electric stream and is called a support.
The skin body up to the electric struma is characterized by its support. If you guess the electronic theory, then with it all speeches are made up of atoms and molecules. The number of atoms of the molecule in different speeches can vary in structure. And the stench itself streaks on the path of free electrons at the conductor, if the electric lance goes strum. That is, if a free electron sticks with the ion of crystalline grains to the material of the conductor, it will inevitably waste part of its kinetic energy and become like a bi opir to its own momentum.
Chim more opir conductor, moreover, let the electric strum pass. The electric opir is denoted by the Latin letter R, and 1 ohm is taken as a unit.
The pivotal characteristic of the support of speech is yoga conduction. What is the electrical conductivity of the material, then it is more likely to conduct a strum. Insulators rank among conductors in terms of conductivity at the greatest number of times, which are equal to one against twenty two zeros!
Pitomy Opir. Vyznachennya that rozrahunok
Otzhe, electric opіr lie in the material, from which the conductor was prepared. And then there are two more important parameters- the conductor's core and the area of the yogo transverse section. Obviously, what a former explorer, tim dovshі іоnіy yogo speech zavozatimut the flurry of free electrons.
And in order to better understand why the opir is deposited in the area of the transverse cut, it is necessary to draw an analogy with water. Give two the same judges, joined in one by a thin tube, and in the other by a tovstoy. On a thin or thick pipe, the water will more likely be transferred from one vessel to another? It dawned on me, what do you think.
Pithomium opir - tse opir of the conductor with a length of 1 meter and a transverse cross section of 1 mm2.
The smallest nursery opir can sreblo that mid.
In this order, in order to calculate the electrical opir of the conductor, it is necessary to speed up the formula:
R = pl/S
de p - pitomium opir, l - conductor's dozhina, S - area of the transverse section of the conductor.
When the temperature of the metal conductor rises, the opir increases. We can explain that the transfer of thermal energy to the body is accompanied by an increase in the intensity of the flurry of atoms in the speech, and it is more important to transfer the free stream of electrons.
With a decrease in temperature in metals, they are created best mind shodo electric strumu. It is necessary to learn such an understanding, like superconductivity, that such a camp of a metal conductor, if it is equal to zero. With every atom, it is practical to catch metal at home, absolutely not overflowing with free electrons. Vіdbuvaєtsya tse for temperatures -273оС.
Jerela:
- School for electrician
If there is a cable re-roofing, then two indications will be shown to the private house-building apartments of a given size: the tightness of the wire is reduced and the strength of the struma, which is to pass through the wire. Opir does not play a different role. All on the right at the small house of wires. And even if the length of the power transmission line is large, then it is impossible to do without the signing of this show. For example, on the cob of the plot, the voltage will be 220-2240 volts, and on the ends, 200-220 volts are already underestimated. Since more and more often in the conductors the copper cables are twisted and wired, then our task in this article is to look at the copper wire support (the table of the wire support will be applied below).
What do we give opir zagalom? In principle, for this additional help, you can determine the parameters of the wire or the material, from which of the preparations. For example, as for the laying of power transmission lines, using the method of tying, knowing the opir lines, one can say for sure that it won’t. Aje often laying is carried out under the ground in an indirect way. But there is one more option, knowing the length of the yard and that yogo opir, you can fix the diameter of the vicor cable, and through this yogo, cut it. Plus, knowing this value, you can recognize the material, from which we conduct the preparations. It’s all about talking about those who don’t varto throw off the rachunkiv of this show.
Everything was worth it electrical wiring But if there are electronics on the right, then in this gallery without a designated support, you can’t do it with other parameters. In some cases, this parameter can play a vital role, to induce the wrong pickup on the support, it can lead to the fact that the attachment simply will not work. For example, as a block of life for a wonderful computer, connect a thin wire. The voltage in such a conductor becomes low, not rich, scarlet vistachatime, so that the computer does not work correctly.
What to deposit opir
Shards are talking about copper dross, first of all, to deposit its physical parameter, ce mid, tobto, syrovinny material. The other is the conductor's ceremonies, or, more precisely, the yogo diameter of the chi peretin (offended by the magnitude associated with each other by the formula).
Zvichayno, є dodatkovі physical quantities, yakі vplyvayut on the opіr of the conductor For example, the temperature of dovkіllya. Adzhe vіdomo, scho when the temperature rises the most drotu yogo opіr zbіshuєtsya. Shards of this indicator are found near the back fallow in the strength (strength) of the strum, in the case of the support moving forward, navpaki, decrease. It's true, it's worth the silence of the metals, as if they were the masters of the positive temperature coefficient. For example, you can bring an alloy to tungsten, which is vicorous for a light bulb filament. For such a material, the change in strength (strength) of the struma is not terrible at high heating, because this metal may have a negative temperature coefficient.
Rozrahunok support
Today everything is ruined for the people. You can create such a simple rozrahunok in a number of ways. Simple, folding. Let's start from simple things.
The first option is tabular. Why does yoga have simplicity? For example, a table for the lower little one.
Here everything is clearly shown and mutually explained. Knowing the songs of the rosemary of the middling dart, you can determine the strength of the strum, which you can see. Abo, navpaki, vaguely in the presence of indications, the support or strength (strength) of the struma, yak, before speech, can be measured with a multimeter, it is easy to determine the perimeter or the diameter of the conductor. This variant is the best, the tables can be found with free access on the Internet.
Another way to make an appointment is to use the help of a calculator (online). Such Internet outbuildings are impersonal, it is easy and convenient to work with them. You can insert into such a calculator the physical values of the copper conductor and take away the measured indicators, or else. True, the main mass of such calculators in their program may have one standard value - the value of the opir midi, which is more expensive 0.0172 Ohm mm² / m.
The first variant of the rozrahunka is to carry out yoga with a hand, vicorist formula. Won axis: R=pl/S, de:
- p – the same pitome opir midi;
- l - dozhina mednogo drotu;
- S - yoga retin.
I would like to show that mid may be one of the lowest pet supports. Lower for more than a few - 0.016.
It is possible to determine the diameter of the conductor through the formula, where the main parameter is the diameter. And the axis of the diameter can be determined in different ways, before speech, such an article on our site є, you can read it and take the correct information.
