# Questions tagged [conductors]

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

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### Litz Limitations

Litz wire is very old, perhaps 100 years. It was used and still is used on Medium Wave ferrite rod antenna coils. The thinner the wire is the better things are at higher frequencies but more strands ...
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1 vote
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### Needs help understanding this breaker: Chint NB1-63 C50. Confusing (63 or 50)

I'm trying to understand information on this AC breaker.(See picture) Is this Rated for 50 amps or 63 amps? Does the "C50" stand for Current? If you think it's 50 amps, how do you know this?...
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### Magnetic Force Between 3 parallel conductors

I have a problem with 3 parallel conductors carrying currents, as shown in the picture. I need to determine the force per meter length acting on the bottom-right conductor (carrying current I2). I ...
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### Can I load a transmission line to more than 10x surge impedance loading?

Assuming that I use a high temperature low sag line that can withstand 210°C CIGRE. These lines have a thermal limit around 20x surge impedance loading (SIL). If I use such line: Do I still need to ...
79 views

### Complex equations in AC RLC circuits spiralling out of control

I'm trying to solve the following circuit. I tried using superposition to find Thevenin at V_o. First I solved for V_o with the current source and dependant source, then I solved for V_o with the ...
336 views

### Derivative of the current through a resistor in an RLC circuit

I have a circuit where I have to find di/dt at t=0+. At t=0+ the capacitor would have 0V across it and the inductor 0A through it. I was thinking of doing nodal analysis at the top and then ...
1 vote
80 views

### When the depth of a conductor is sufficiently large, is the reactance equal to the resistance? [closed]

Is the reactance in a conductor approximately equal to the resistance in a conductor when the depth is very large? If so, why? I'm struggling to understand the concepts behind this. I believe it has ...
1 vote
101 views

### Thermodynamics of a simple electrical conductor

I derived an expression for the time constant of the temperature of an electrical conductor and was looking for some constructive feedback. Initially there is no current flowing through the conductor ...
26 views

### How to measure the electrical properties to ensure the performance of a thin electrode/insulator stack-up?

I am a mechanical engineer by trade, and I am looking at some basic electrical properties that I need to measure to ensure the device meets the desired performance. The device consists of a two-layer ...
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### How can a wire be influenced by a electromagnetic field?

I have a problem in one of my project. Here are some details: A train is moving on tracks. To know its location, some beacons (transmitters) were placed at different locations in between the two ...
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### Spherical capacitor properties

If we consider a spherical capacitor (having an inner conducting ring surrounded by another such conducting ring), how can charge reside on the inner surface since it's surrounded by another conductor?...
124 views

### Finding resistance between two conductors

For my electromagnetic-field class we are asked to calculate resistance between two electrodes shown as below. The part c(i) is just a simple resistance question using the formula R=pl/a. I don't ...
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### Why is a temperature rise within an electrical component or assembly measured in kelvin?

I came across an IEC standard which uses Celcius as a temperature unit for maximum temperature limit E.g. IEC 60085 states class Y insulator maximum temperature limit to be 90°C, average ambient ...
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1 vote
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### Finding an analytical expression for a current distribution for conductors in parallel

Recently, I tried to set up an experiment at home to study what path the current takes at different frequencies for the circuit below. I think this will be a fun project, but I'll need your help. I ...
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### How to calculate the maximum current a wire can handle?

Is there a formula for calculating the maximum current a wire can conduct without melting? I found one: I = αd^(3/2) in which I = fusing current, d = wire diameter in inches, and α = a constant ...
1 vote
419 views

### How does the electric field inside a conductor remain zero?

I'm learning about current in conductors, and came across the statement that "The electric field inside a perfect conductor is zero", this is frequently explained used Gauss´s Law by saying ...
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### How to properly connect metallic conductors to graphite electrodes?

I want to prepare graphite electrodes for electrolytic experiments. I am therefore looking for good ideas on how to get very intimate, long term stable and low resistance connection between the ...
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### Short circuit behavior in very complex circuits (First Order RL and RC circuit problems)

I do know that a resistor is by passed when parallel to a short circuit or wire with no branches. However what if it was within a complex circuit and not just in the outer loop how does that by-passed ...
279 views

### If there are two electrical conductors in a circuit with differing electrical conductivities will electricity choose the most conductive conductor?

Say you had two parallel wires, one copper and one steel, copper having a much higher conductivity than the steel, will electricity choose to flow through the copper wire, ignoring the steel wire?
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### How can rubber sheathing be prevented from wearing off a shielded, coiled cord?

An electrical device which I own has a hand control with a rubber shielded coiled cord with five conductive wires inside, and another with seven on a different model. When the rubber is old, the ...
83 views

### 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 ...
112 views

### 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. ...
1 vote
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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" ...
139 views

### 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 ...
178 views

### 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 ...
334 views

### 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 ...
1 vote
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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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