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Questions tagged [conductors]

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

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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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434 views

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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51 views

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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89 views

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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103 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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4answers
9k 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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67 views

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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3answers
238 views

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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Partial capacitances of a system of conductors - conductor acting as a shield

I have a small question about the following problem. The figure represents the cross-section of a three-conductor system comprising a communications coaxial cable of length l running parallel to a ...
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1answer
129 views

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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1answer
43 views

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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3answers
148 views

Using Chassis as a conductor for DC Power Supply Return

Is it considered a good practice to use the chassis as a return path to a DC Power Supply? I have been given a rack mounted device that switches 480 volt power on/off remotely. The remote feature is ...
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2answers
249 views

Can a capacitor charge and discharge at the same time?

Is it possible to use the stored energy while the capacitor is being charged? In other words, use a capacitor almost as a conductor? My gut says the answer is probably no (and my own experiments so ...
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152 views

PCB conductor spacing high voltage

How much distance I have to create on a PCB between a coated conductor and an uncoated component pin with a voltage difference of 200V? From different websites and calculators I can only get the ...
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1answer
65 views

Is it safe to use individual conductors removed from a multi-conductor cable?

I am working on setting up a research lab at a university as a graduate research assistant. We're working on power electronics in a three-phase environment, which means we'll be using at most five ...
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2answers
209 views

galvanized wire as material to construct a sensor matrix

I did a button matrix using galvanized wires (only one thread, 1 mm thickness) and it works. (But) I don't know, it's a good material o it can melt with temperature? Maybe galvanized metal is a "bad ...
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471 views

Is a hole in a conductor the same thing as a positive ion?

The flow of current in a (semi-)conductor is often described as holes and/or electrons moving between atoms. In this context: Is an atom with a hole the same thing as a positive ion (cation), and Is ...
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77 views

What to do when I have energy loss due to distance

I have to connect a total of 15 12 V, 2 A motors in parallel. They are all going to be connected to a battery and I’m trying to bring a line to connect all 15 of them. The distance between them is 25 ...
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190 views

“etching” transparent conductor on transparent plastic film or glass? [closed]

I've put the word etching in quotations as the method to get conductive tracks on a glass or plastic film might not involve a subtractive approach as with traditional PCBs of applying a conductive ...
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1answer
149 views

When high frequency current goes through a superconductor, does it still radiate off like it would with copper?

I've been thinking about the skin effect and that got me thinking... When high frequency current goes through a superconductor, does it still radiate off like it would with copper? Just curious.
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40 views

Different conductors in the electical circuit

Recently my brother has decided to change conductors in the home's electrical circuit. We had aluminium conductors and now we are going to replace it with copper conductors, but my friend told me ...
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1answer
650 views

How nickel plated copper strip can be welded? What is the optimum thickness of nickel layer?

I have a trouble with (resistance) spot welding of nickel plated copper strip to 18650 battery. I tried to weld 0.1mm, 0.2mm and 0.3mm copper strips with 5 micrometers and 10 micrometers nickel plate ...
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1answer
98 views

Boundary conditions of the Electric field of a conducting transmission line

Solving Maxwell's Equations for the Electric Field of a linear-isotropic cylindrical conductor leads to the electric field being proportional to the Bessel function of the first kind (see below). ...
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1answer
71 views

Unlimited electrons?Can a conductor cancel a very strong field?

I started studying about how a conductor behaves once placed inside an electric field E0 . The electrons will move inside the conductor according to the electric filed's direction gathering at one ...
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51 views

Predicting current flow through crosshatched wire

Consider the crosshatched current-carrying wires depicted: The shorter wires have been placed on top of the longer wires. Each wire can facilitate a maximum of 170 amperes of current and contributes ...
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141 views

Can overhead ground wire of major transmission lines prevent induction through solar storms?

As I understand it the overhead ground wire found on major transmission lines is placed there in the event of a lightning strike which prevents a surge in the phase conductors. My question is, could ...
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4answers
1k views

Electrical resistance of two conductors of equal surface area in contact with another?

Resistance of a wire can be determined by the formula R = resistivity*(length/area). What if you have a wire composed of two parallel metals that are in contact with one another? Will the resistivity ...
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Do 2 conductors (1 grounded via resistor) reach equipotential, before surplus electrons drain to earth?

Case I: a negative conductor makes contact with a neutral conductor. Negative donates some electrons to neutral, until there is 0 potential difference. Then they both are slightly negative. This ...
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Why do soldering guns use copper as a heating element?

According to Wikipedia; The body of the tool contains a transformer with a primary winding connected to mains electricity when the trigger is pressed, and a single-turn secondary winding of thick ...
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7answers
543 views

Conductive Adhesives?

I'm helping with a kid's Maker's project. We need to attach some LED's to some coin cell batteries for part of a holiday project. Are there any conductive adhesives we can use for this? Durability ...
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1answer
2k views

How to calculate total impedance of two parallel conductors

I am trying to calculate the total impedance of two parallel copper wires under the following conditions: The copper wires are thick I want to include all relevant effects, including (but not limited ...
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183 views

Typical resistances of jumper wire and silver foil

What is the typical resistances of the following or how can I go about calculating this approximately? 1) Typical jumper wires used in prototyping with breadboards 2) a silver foil with dimensions ...
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1answer
1k views

Calculate total impedance in circuit with series RL in parallel with C and R

Hi im trying to find the total impedance in this circuit but im having troubles figuring it out. I have calculated the individual impedance for each branch like following: Xc = 46.8 ohm at -90 degrees ...
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1answer
78 views

How does electricity pass through a surface (or more generally, conductive material with complex geometries)?

I was reading this article on how the breaking mechanism of a Sawstop works. For those who might not know, Sawstop is a table saw fitted with at least a conductivity sensor that detects changes in ...
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Will electricity flow in a perfectly conductive medium?

I was just wondering that since resistance is required for a potential difference to build up, what happens when we have a perfectly conducting wire, 0 resistance? Will current still flow through the ...
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What is the metallic coating on these stranded copper wires?

The 5-colored wires's strands looks like aluminium, but it is basically copper wire at centre, with a thin conductive coating (my teacher shown it to me) of silvery-color, so that the copper doesn't ...
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3answers
546 views

Sizing battery cables

I'm confused about the sizing of the battery cables for a UPS system, When the battery is discharging the voltage decrease and current increase to a maximum value (which depend on the end of discharge ...
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3answers
2k views

How can I ensure low-resistance ground contacts to an aluminum enclosure?

I am building an electronics project with an aluminum enclosure. I need to ground it—and very well—for human safety. (The system handles 300 A of current, and I want to be sure that if there is an ...
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2answers
563 views

transformer windings

I have a 900 watts transformer from a microwave, this used to have a secondary voltage of around 2000 volts (for the magnetron) but I removed it. I wonder if by using 15 turn secondary that will give ...
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4answers
2k views

Why skin effect happens at the center of a conductor?

I was reading an article about Skin Effect. I know what skin effect is, but I wanted to know what causes it. Why is the back EMF strongest at the center? Why is it not distributed uniformly at the ...
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1answer
751 views

Two conductors in parallel

If we have one conductor through which current flows, and we place second conductor near it, the conductor with current flowing will induce electron flow in the second conductor. Can we detect the (...
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1answer
95 views

What happens when I put a charge inside a conductor that is already in static equilibrium?

I understand how, when a neutral conductor is charged, the charges will repel each other and after the relaxation time will all be distributed in the surface of the conductor. My question is: after ...
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1answer
85 views

Where can I find a good theoretical treatment of conductor shielding?

Suppose one has three current carrying cylinders lying on the same plane. Some of the electric field of the first conductor ends up on the second conductor, which creates capacitance \$C_{12}\$. But ...
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2answers
844 views

How can I work out if a cable can take a momentary current spike?

In this video here, almost 1000A is being run through a 10mm steel bar, and after a minute or so, it melts. https://www.youtube.com/watch?v=YzZ3aJqmT-M So in terms of charge, 60,000C applied for 1 ...
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7answers
7k views

Using a bottle of water as a resistor

Today, while drinking some water from a \$500mL\$ bottle, I started reading the info about the water and found out that the conductivity (\$\sigma\$) at \$25°\$C is \$147.9\mu S/cm\$. So it came to my ...
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519 views

What are types of connection between metallic conductors and glass part of an LCD?

I know that elastomeric connectors are being used to connect metallic conductors to the conductive paths on the glass part of an LCD but there must be other ways being commonly used. For example in ...
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1answer
322 views

What happens when a conductor gains potential, but is not completing a circuit

I asked this on the physics stack initially, but I think it could also be appropriate here. I am not confused about how a conductor gains the same potential as the lead it is connected to (in the ...
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2answers
209 views

Is it possible to carry over 20MW? [duplicate]

Is it possible for a series of conductors carry massive currents(100 kA) at voltages over 100V? Assuming there is massive cooling. How can power plants carry MegaWatts of power?
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7answers
5k views

Over 10,000 amps?

Is it possible to have a 5 meter wire that has 10,000 amps or more current flowing? I assume this can be done with a step-down transformer and the voltage could be 2V and lower... I assume that most ...
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2answers
251 views

Is a conductor like a capacitor

Sounds a daft question but I got thinking about another question and this cropped-up. Background - In a conductor electrons move seemingly in a random fashion and more so when the conductor is warmer....