All Questions
Tagged with electricity conductors
160
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How does 'conservation of law of energy' work in an open circuit connected to a hydroelectric generator?
I am trying to relearn high school physics and having trouble visualizing electricity in an 'open' circuit.
I am going to use layman terms so i don't confuse myself! Apologies in advance if i am ...
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Why is the electron mobility 'irrelevant' in metallic conductors?
This Wikipedia article states in the introduction
Conductivity is proportional to the product of mobility and carrier concentration. For example, the same conductivity could come from a small ...
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What makes electrons 'more free or less free' to move around?
I understand that conductors allow electron flow because their valence electrons are 'free' to move around.. But what exactly determines this 'freeness' and the lack thereof that separates conductors ...
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What is the exact mechanism of flow of electricity? [duplicate]
When a steady current
flows through a conductor, the electrons in it move with a certain average ‘drift speed’.
One can calculate this drift speed of electrons for a typical copper wire carrying a
...
user223406
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Skin Effect Explanation
I do not understand some things about the Skin Effect.
Its Wikipedia definition is:
Skin effect is the tendency of an alternating electric current (AC) to become distributed within a conductor ...
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Why can't free electron flow in water to conduct electricity?
This question is related to how batteries work. In a battery, the electrons can only flow in conductors, because they can't flow in the solution.
my own thoughts on the matter:
I believe it is ...
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How electric current is defined in a metal wire?
How current is defined if in a metal wire both positive and negative charge exist? Isn't the total charge/time 0?
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Is it possible to become electrocuted even if using a Faraday suit on a high-voltage line?
I am a writer. I'm working on a novel (yes, fiction) but want to do my best to present a passage as accurately as possible.
The crux of the question is whether or not someone using a Faraday suit ...
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Effect of electroplating on resistance
How will resistance of a wire be affected if I electroplate it with copper will it decrease ? And if yes then will the decrease be significant?
I need to find a topic for my project I thought it might ...
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Charge accumulation in wire
I came across a question about charge accumulation. It states that if a steady current flows in a wire composed of a copper and iron wire of same area (see fig), will the charge accumulate on the ...
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How does the current become homogeneous within a circuit?
I have two questions:
In a given circuit with resistances of different values connected in parallel, there is a different build up of electrons when the power source is turned on. Then, how is the ...
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Creation of electric field inside a conductor
My book says that as soon as the two ends of a conducting wire touches the two terminals of a battery, it generates an electric field inside the conductor. Why?
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derivative of the electric field along the normal to the surface near the conductor
how to derive the formula approves the derivative of the electric field along the normal to the surface near the conductor is inversely proportional to the principal radii of curvature?
$\frac{\...
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2
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Does electric current create positive ions while flowing through a conductor?
As the conduction electrons are free to move randomly, i.e they are not restricted to a particular atom, then why don't these atoms get positive charge due to loss of these conduction electrons?
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3
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Electric shielding skin depth
I read that lower the frequency,the deeper is the skin depth in conductor.If we are using piece of thin conductor,like aluminum foil for example to shield something from electric fields,it would ...
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Some questions regarding electric properties of materials [closed]
I was reading Chapter 29 on Halliday-Resnick-Krane regarding this but couldn't understand these things.
Suppose you have a conductor in an electric field. In normal conditions the field inside the ...
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Car hit by a lightning strike
In Griffiths' Introduction to Electrodynamics, at the Electrostatics chapter, in particular, in the conductors section, he says this after the stating that within an empty cavity surrounded by a ...
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What is drift speed in electricity and how is it related to the cross sectional area of the conductor?
In fluids dynamics, I learnt that as rate of flow is constant for an ideal fluid, Area(cross sectional area of the tube) x velocity is constant.I had a doubt whether the same relation exists between ...
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Mechanism of electricity in conductors
In mechanism of electricity in conductors my teacher said the free electrons collide with positive lattice and this positive lattice is oscillating about its mean position. Ok for producing current ...
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Capacitance due to accumulation of charge on the interface between resistors
It is well known that the continuity condition for current density necessitates that at a steady state:
$$\frac{\rho}{\epsilon_0}=-\frac{E\cdot \nabla \sigma}{\sigma}$$
Where $\sigma$ is the ...
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What is the cause of opposite electric current direction of flow of current inside a battery?
My question is that why the direction of current inside a battery is different than that of outside battery?Can someone explain how current is even carried inside a battery because free electrons aren'...
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What's happening at a molecular level to the resistance when the temperature of salt water is increased?
What's happening to the electrical resistance at a molecular level when the temperature of a water with a bit of salt is increased? I noticed that the resistance decreases but in metals it is totally ...
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Kubo formula derivation
In the derivation of the Kubo formula for conductivty we write the total hamiltonian as $$H_{\text{tot}}=H_0+H_{\text{ext}}$$ where $$H_{\text{tot}}=H(A_0+A_{\text{ext}}),$$ $$H_0=H(A_0)$$ and $$H_{\...
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Is the speed at which electrons move through a conducting wire binary?
If a voltage differential causes electrons to move through a conducting wire, and no other forces are acting against them, will they always move at the highest possible speed through that material?
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There is no electric field in a metal if the current through the conductor remains constant.
In a chapter of superconductor, I found, "There is no electric field in a metal if the current through the conductor remains constant". My question is, "Why the electric field is zero in such case?". ...
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Can you conduct electricity through a banana peel?
While grabbing a banana for breakfast today I got zapped due to static electricity building up while I was moving on my chair, but the conductor I was grabbing was said banana.
Is it possible to ...
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Tree vs lightning rod: why does one burn and the other not?
I have this simple question, but I cannot find the answer.
I saw this video about a plane getting hit by lightning. In it, Captain Joe explains why people do not get electrocuted. This has a simple ...
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Point resistance
The resistance of a given object is expressed through:
$$R=\rho\frac{l}{A}$$
I'm wondering if there is any quantity like resistance at a specific point. For example, $R$ for a copper wire with l=...
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Is it possible for a conductor to run out of free electrons?
For example, imagine I apply a high voltage to a piece of conductor (copper) and make the electrons jump out of it like a automotive spark plug. Can the copper after a prolonged period of time run out ...
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Dielectric Grease on Electrical Connections
The electrical connection between my truck and our RV trailer was intermittent. When I wiggled the connection the errant light would go on and off, so I bought some electrical grease and problem ...
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