Questions tagged [conductors]

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

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1answer
36 views

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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2answers
70 views

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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0answers
43 views

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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1answer
49 views

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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0answers
37 views

Conductor loop magnetic field in the middle

Why I have to take in the formula \$ H = \frac I l \$ the diameter and not the radius of a conductor loop when I want to know the magnetic field-strength in the middle of it. I have a conductor loop ...
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0answers
26 views

Is there any difference between grounding bus bars and bus bars in general?

My intuition says no, there is no difference, other than ground bus bars are bonded to the grounding reference. As a followup, can any busbar be used as a current-carrying conductor by using ...
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1answer
60 views

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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9answers
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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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2answers
58 views

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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4answers
114 views

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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1answer
46 views

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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2answers
398 views

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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1answer
83 views

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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3answers
1k views

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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7answers
301 views

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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1answer
41 views

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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2answers
3k 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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1answer
185 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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3answers
98 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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2answers
154 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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2answers
68 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
552 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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1answer
143 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
64 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
421 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
739 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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2answers
278 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
71 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
784 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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5answers
1k 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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4answers
86 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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1answer
216 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
45 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
2k 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
132 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
85 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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1answer
57 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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1answer
147 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
2k 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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2answers
50 views

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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2answers
1k views

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
578 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
3k 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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1answer
325 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
2k 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
81 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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7answers
461 views

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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5answers
3k views

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
759 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 ...