Questions tagged [conductors]

A conductor is an object or type of material which permits the flow of electric charges

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Why is the potential drop across a perfect conducting wire zero?

The reason I feel this isn't right is V=-dE/dr so, when there is an electric field in the wire, there is a potential drop across it too, however, I've been taught that the potential drop for an ideal ...
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Converging Electric Fields on Metal Plate

I have a question, but I'm not a trained engineer, just curious. So bear with me on my explanation. Let's say I have a metal plate. I have DC power supply and I connect the positive electrode on one ...
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Negative to chassis or separate wire?

In automotive applications typically battery negative is connected to the chassis, right. This makes the chassis be at the same potential as battery negative, but when completing a circuit, ultimately ...
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What does it mean to assign a conductor?

I am reading about SATA power here. They say the following: The power cables for the SATA interface are of similar construction as the signal cables, but have 15 conductors. They supply power to the ...
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Resistance vs capacitance of conductor

Suppose we have a wire which transmits power. Is there a direct relationship between the resitance (or conductance) of the wire/m and the capacitance of the wire/m? Or they are independent of each ...
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Using nichrome as a conductor?

Can we use nichrome as a conductor by connecting it in parallel with a small resistor such as 1 ohm resistor to lower its resistance?
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Charging by electrostatic induction in a new way. Will it work? Instead of connection to Earth I am connecting to another conductor

I am adding the figure of a conventional setup for electrostatic induction. The drawn setup on paper is the special setup. If you don't want to read whole description then just read the summary. ...
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How can a conductor have voltage without charge on it? Taking in electrostatics [closed]

What does it mean if the potential of a conductor is Kq/r which is at r distance from the charge q? How can a conductor having no real charge have some potential (which is here KQ/r)?
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Any idea if a 2/0 3C teck cable will have fitment issues through a 1-1/2" Metal LB?

I need to feed a 45 kVA transformer and I need to use an LB to pull the conductors through. Will I have issues with the bend radius of the 2/0 conductors? It's a 3C cable. the conduit is 1-1/2" ...
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Does current flow from earth connected conductor in uniform electric field?

If we place a conductor inside of uniform external electric field then opposite charges will get induced on the both sides of conductor. What if we connect two earth wire to each side, will continuous ...
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How do I size conductors to a three-phase induction motor to account for voltage drop?

Suppose I have a 480-volt nominal electrical distribution system, and a 460-volt nominal motor. Assuming +-5% variation in the source, it could get down to 456 VAC. I've seen references to motors ...
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Voltage drop calculation

The impedance of a single phase load with a supply voltage of 120 Volts AC is 2.80+j2.076Ω. The load draws 30 amps at 85% lagging power factor. Determine the size of the conductor used to supply power ...
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stranded wire resistance compared to solid wire

Why is it that a stranded wire has higher resistance than a solid wire? Although the area of the stranded is more which means more skin? ""The resistance of the stranded conductor is ...
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PDN Analysis of PCB - Max Conductor Current Density and Max Via Current Density

I just started using the PDN Analyzer tool of Altium and am getting acquainted with it right now. While the tool with its visualization windows is quite useful, I am confused about what values of ...
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Calculating field due to induced charges at exterior of conductor

We have an arbitrary hollow shaped conductor, with small thickness. Suppose we place a charge q at any arbitrary location within the hollow shaped conductor. By Gauss's law there will be a total ...
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the actual no. of diameter of stranded conductor

I have ordered a .G.C. CU. COND. 3 CORE XLPE/SWA/PVC 50mm² 11K.V. ( no.of diameter of wire before stranding 7/3.02) but unfortunately I received (no. of diameter of wire after stranding 7/2.754) after ...
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Why can't conductors be used in making ICs (integrated circuits) instead of semiconductors? [closed]

I really wanted to ask why we can not control flow of electrons in conductors. Can I not say if a current is flowing in a conductor it is 1 and when I disconnect the supply it is 0. Can you elaborate ...
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Phase difference between electric and magnetic fields of EM wave in a conductor?

When an EM wave travels inside a conductor , we see that there is a phase difference between the Electric and magnetic fields within the conductor. The magnetic field lags behind the E field and this ...
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Counteract joule-heating

I've got a project where I have an intricate structure made of fine wire, through which a comparatively large current will be sent. Unfortunately, the conductor itself respons poorly to heat, and if ...
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Derivation of formula for temperature coefficient of resistance

https://www.electrical4u.com/temperature-coefficient-of-resistance/ Referring to this article, I'd like to compile two key formulas for the temperature coefficient of resistance. First is the formula ...
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Derivation of resistance of coaxial cable

As given here, the derivation of Resistance for Coaxial Cables Consider a coaxial cable of length \$L\$, consisting of a cylindrical conductor of radius a surrounded by a cylindrical conducting shell ...
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Charge on parralel cylindrical conductors with reverse current

Suppose one has two parralel cylindrical conductors with a distance \$d\$ and an radius of \$\rho\$ while \$\rho \ll d\$. The currents through the conductors are reverse, but the absolute current is ...
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Is there a name for this type of connection? [closed]

I can't think of a time when I've encountered this, but I think that this is a thing: you have two conductive paths that, when connected, become one path. How they become connected is through tension/...
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Refractive index, wavenumber, and wave impedance of the PEC that a plane wave is normally incident on

I am trying to find the refractive index \$n_t\$, wavenumber \$k_t\$, and wave impedance \$\eta_t\$ of a perfect electric conducting medium t. Here is my work so far: The conductivity of the PEC is \$...
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Distribution of charges in an electrostatic study

I have a question concerning the capacitive coupling between two conductors. The capacitance C between the two is only a function of the diameter of the 2 studied conductors, the insulation thickness ...
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Skin effect - decreasing AC current part

The image provided by wikipedia (the black marks are mine) explains clearly the skin effect when AC cirrent increases - the current I increases, thus H increases, and because of lenz law the eddie ...
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Need of semiconductor instead of conductors for changing conductivity

Is changing conductivity is one of the reason to use semiconductors? When we can change conductivity of metals(by some means) then why do we need semiconductors instead in most of the electronic ...
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Charge transfer in conductors of different metals by touching

when we touch two metallic conductors one is neutral and other has excess of charges, Case 1- Both metals are of copper, then we can calculate actual charges on them at steady state by capacitance ...
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If wire was thread

I have a small paper lantern that is hung on a thread. The lantern only weighs 20 grams, but it pulls the thread taught. I want to light the lantern with a small LED. Despite the increase in weight ...
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What is the relation or advantages or reason about these advantages of bundled conductors?

The book show me the advantages of bundled conductor Decrease the loss from electronic corona Decrease the reactance and voltage drop and increase the efficiency of power transmission Decrease the ...
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Ethernet cable with largest conductor diameter

For a Power-over-Ethernet type of project, I'd like to use cables with low resistance. It seems a higher category (CAT5, CAT6, CAT7) does not necessarily mean the conductors used are larger in ...
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What material should I use for the plates of my homemade mica capacitors?

I recently acquired some mica as i want to build my own high voltage (50 kV if possible) capacitors. The problem I am encountering right now is that the surface of such a crystal isn't perfectly flat ...
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Resistance of wire

I am currently studying Practical Electronics for Inventors, Fourth Edition, by Scherz and Monk. Chapter 2.5.1 How the Shape of a Conductor Affects Resistance says the following: The resistance of a ...
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Resistor ratings for inductor fly-back suppression

I am building a circuit for user to interface with relays, and I am trying to build a protection to the circuit against fly-back from the inductor coil of the relay. Since there is no specific relay ...
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Voltage on a Transmission Line with Ideal Conductors

Let's consider a transmission line with Perfect Electric Conductors. We know that if an external AC source is applied, we get a voltage waveform between the conductors which is function of the ...
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Voltage drop in a conductor

My textbook, Practical Electronics for Inventors, Fourth Edition, by Scherz and Monk, says the following in section 2.3.1 The Mechanisms of Voltage: In regard to potential energies of free ...
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How to determine cross section of cable [duplicate]

I'm looking at this table that suggests a 0.5mm2 cable could withstand 720W at 3A. At the same time I used a cable size calculator online to determine the size of cable I would need to use for a ...
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Is Mica non-conductive?

Are mica flakes like ones found in makeup and body lotions completely non conductive and should I be worried if it gets inside the components of my computer? Or should I be more concerned about ...
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Which is a better conductor, a very thick rubber wire or a very thin copper wire?

I read somewhere that very thick wires are generally better conductors than very thin ones. Is this true? If yes, then would a very thick rubber wire be a better conductor than a very thin copper wire?...
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Two short circuits

I wanted to ask a concept but couldn't guess how to explain so I'm taking help from this example. This is not a homework problem. Now my doubt is all the current will go through the horizontal ...
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Is it right to define ground as a pool of surplus free electrons, like a metal?

In a dipole antenna or any other pole like antenna, there is supposedly a ground on one side causing the current to flow away and towards the ground towards the feed, but if the whole antenna itself ...
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2 answers
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What is signal ground

I encountered signal ground symbol while studying 555 IC Please explain why isn't a simple ground connection used and how does signal ground differ from normal ground. I am a first year undergraduate, ...
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Parasitic Inductance

when we say that in a wire there is a parasitic inductance, what is its cause? Is it the skin effect of the wire, the magnetic flux (generated by the current) through the surface of the total circuit ...
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Current Flow in conductors [closed]

How current flow remains continue in a conductor when all the free electrons reach from negative terminal to positive terminal?
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2 answers
420 views

How current and potential propagate through electrical circuits?

I have something of a theoretical question. In any given electrical/electronic circuit there seems to be an electric field developed inside (and outside the conductors?) to push the electrons in the ...
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29 votes
5 answers
11k views

I've become an electrical conductor for my headphones... but how?

So I have a pair of Bose noise-cancellation headphones that I plug into my keyboard every night to charge them (via my keyboard's USB port). My keyboard happens to be a metallic Apple keyboard. You ...
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Can you turn two inductively coupled conductors into a transformer?

So I'm working on a school project, and to be honest. Don't know a lot about electromagnetism. I want to make a wireless charging station that could be plugged into the outlet. Of course I don't want ...
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Coaxial cable: how is it possible to define a conductance?

I have a coaxial cable with internal conductor of radius r1 and external conductor of radii r2 and r3. The material of the conductors has a conductivity \$\sigma_1\$. Between the conductors there is a ...
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earthing conductor

I'm studying the subject Electrical Safety in Engineering and a special term really drew my attention. When I tried to google it, no any option was suggested but Protective conductors. In the ...
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Ohmic power loss due to electric field

Recently I read in the basic EM theory course , that the Ohmic power dissipated in a conductor is directly proportional to the conductivity and the square of the electric field intensity , but we know ...
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