Questions tagged [electron]
Anything related to the behavior and properties of electrons, i.e. the elementary subatomic particles accounting for electrical conduction in most solid materials, especially metals.
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Can a photon be modeled using AC driven electron and AC driven wire loop?
Can a photon ("electromagnetic wave packet") be simulated in software as an electron bouncing up and down (for the oscillating E field) and a loop of electrons with neutralized electrostatic ...
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Carrier concentrations versus temperature and doping in Matlab
I am currently self studying structure of semi-conductors and I would like to make a graph in Matlab of the number of carriers as a function of temperature and doping. Let's say that I am testing ...
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Deflection of current in a metal plate conductor
If I have a metal plate (square in shape) and an electric current moves from one side to the other. I understand that most of the current will take the path of least resistance but all paths will be ...
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How to calculate the diffusion length in modulation doping?
I have read a paper about an application of modulation doping in bulk thermoelectric materials. In this paper, the nanoparticles diffuse carriers into the host materials, and I want to estimate the ...
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Why do electrons move in a circuit? [closed]
I am trying to make sense of why electrons move in a circuit.
I did my research and the first answer I got is because of the difference of electric potential between the two points of the battery that ...
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Current in BJT at EBJ and its mechanism about Diffusion and Drift Current
I have seen this post and I'm still confused about what mechanism would be applied on majority carrier, and it seems to me that the post I cite only explain about how the minority carrier move from ...
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How I can use light to control of amplifier?
I want to make a car that I can control by light, and I thought of using a photoresistor and a light sensor to control the amplifier to make it perform two functions.
The first function is to make the ...
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Is it possible to make cathode ray or electron gun without a vacuum?
I stumbled upon this picture on the internet here is the link
https://www.reddit.com/r/ElectroBOOM/comments/16azeq5/cathode_ray_succesfully_shooting_a_plasma_beam_in/
I wasn't able to get info from ...
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Propagation speed and capacitors charging speed of transmission line
I am a bit confused on the speed of voltage propagation in the transmission line and I hope someone can enlighten me. I understand the speed of step up voltage propagation is in the same order as the ...
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Why does the neon screwdriver (phase meter) light on just by touching the phase wire?
I had a question, can you answer it: as you can see in the picture I uploaded, the single-phase alternating current flows in one wire at one moment and in the next moment from another wire as in the ...
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Two power sources
Please consider a circuit with two loops where the two loops have a common part with a single resistor. There are two power supplies (or of it matters say these are voltage sources, like batteries, ...
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Is there a colour code for electron flow notation? [closed]
I'm building a power supply for electro-chemistry experiments. It would make more sense to have the output correctly denote which terminal is 'electro-negative' and which is 'electro-positive' instead ...
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Moving electrons on the surface of a thin metal sheet with high current
I don't know if this is the right place to ask this because my question is a mix of physics and electronics. I'm in 12 grade, and wish to conduct a simple physics experiment.
I would like to observe ...
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Trying to understand electron flow in a rapid start ballast fluorescent light system
While looking into what is required to upgrade a fluorescent tube light to a LED solution, I found that I don't truly understand what is happening with existing fluorescent solutions.
I understand the ...
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Effective Mass of Electrons
In electronics, the fact that mobility of electrons is higher than the mobility of holes is frequently used. How can we explain this using effective mass of electrons and holes ?
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What is the total charge Q of 1 m³ of copper?
I was wondering if I can calculate the total charge Q of 1 m3 of copper, see my calculation in the picture below. Is this correct?
The correct solution (thanks to the community in the comments below):...
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Reasoning behind the density of free electrons/holes being constant with respect to volume of a semiconductor material
Consider a silicon semiconductor material which is having a cuboid shape of dimensions \$2\times 2\times 1\ \mathrm{cc}\$, suppose the atomic density of silicon is \$10^{22}/\mathrm{cc}\$, so in all ...
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How do receiver circuits differentiate between carrier/signal waves?
I've been told and shown that a receiving antenna will pretty much pick up any signals around itself. You can then filter out the frequency you want in order to do something with it.
What I don't ...
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Can electron microscopes record video of electricity?
Since electron microscopes capture electrons, can they be used to capture electrons moving in a circuit, and have they been used for this?
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Conventional current and electron flow in Arduino
On an Arduino there are some pins named GND, some are 5 V, and so on. If electrons flow from the negative to the positive terminal, then does this mean that they are flowing from GND to one of the ...
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Fermi level of metal
Do metals have fermi level? As we know conduction band and valence band are overlaped for a metal. Does it make any sense for metals to have fermi level?
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Can very small currents be accurately measured using only standard analog electronic components on an IC? [closed]
Let's say, for example, that I have a photodiode, which produces electrons in response to the amount of light.
What is the theoretical lower limit that can be accurately measured only using basic ...
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Is it possible to force charges into one plate of a capacitor?
As we know, a capacitor stores energy, but the net amount of charge in it doesn't change. If an electron enters one plate, another leaves the other plate. If the other plate is floating, the entering ...
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Why don't most electrons hit the anode in a cathode ray tube or electron gun?
In a cathode ray tube or electron gun, electrons liberated from the cathode by thermal emission accelerate towards a ring-shaped anode, from the potential difference between cathode and anode.
If an ...
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Do electrons flow from higher to lower or lower to higher potential?
I have seen countless sites saying electrons flow from higher potential to lower potential, but then again I have seen many saying that electrons flow from lower potential to higher.
I have always ...
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Are vehicle electrical components powered from the negative side?
still trying to get my head around electron flow as opposed to conventional current regarding automotive electrical circuits. There seems to be a ton of conflicting information/advice out there so I'm ...
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How is current the derivative of charge
If electric current is the time rate of CHANGE of charge. Then if I have a DC fixed current flowing into a resistor, same amount of charge is always flowing to that resistor, hence the derivative of ...
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The probability that an electron occupies the fermi level at 0K
I was trying to find the probability that an electron occupies the Fermi level at 0K.
Fermi function: {exp[(E-Ef)/kT] + 1}-1;
(k = 8.314 J/mol/K)
According to my calculations, the answer would be 0.5.
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3 Phase Motor to DC Output
In a standard car alternator there is are 3 diodes that keep each of the phases from ever pulling electrons.
There is then a capacitor to smoothens it all out.
However how is it possible that the ...
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KCL when rate of electron flow is given ; To include electron sign or not
Q) We have to determine the I. Magnitude of electron charge is 1.6 x 10^-19C.
I have fundamental confusion in this problem. Should we consider the negative charge of electron while doing the problem. ...
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