Questions tagged [electronics]

Electronics is the study of electric circuits and electrical components, and the design of useful devices. Some questions in this tag may be more appropriate for the [Electrical Engineering(https://electronics.stackexchange.com/) SE site.

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Potential difference in a ring

Basically in a circuit there is a cell with a positive and negative end, and current flows through it - electrons are pushed by negative electrode and attracted to the positive electrode. But if say a ...
Questioningmind's user avatar
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1 answer
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Reverse current

I'm getting started with electronics and couldn't help but wonder about this. When the PN junction diode is reverse biased, P connected to the negative terminal and N connected to the positive ...
Santhosh S's user avatar
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1 answer
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Mysterious sound from measurement setup in "zero measurement"

Once a colleague showed me a sound measurement setup in a reverberation room, meant to measure (unwanted) sound from magnetostriction in ferrite cores. There was a problem creating a true "zero&...
Jos Bergervoet's user avatar
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0 answers
35 views

Pulse to sine with the same frequency

I have a pulse signal with frequency f(t) And i want to generate from it a sine signal with frequency f(t) (f(t) doesn't vary a lot in time) Is there a method to do it directly with a function ...
mahboul 3's user avatar
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1 answer
37 views

Force on charge carriers in a simple circuit

Is it true that in a simple circuit where a simple conducting wire is connected to a battery, the force on each charge carrier is same in magnitude ? If yes, then can you explain how? I know that if ...
Hufaiza Hufaiza's user avatar
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1 answer
47 views

Microwave oven efficiency and conservation of energy

Wikipedia says that microwave ovens can be around 50-64% efficient at converting electricity into microwaves. Where does the energy lost at this stage go? And how much of the energy that is ...
Karl's user avatar
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1 answer
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Resistance in series also slows current down so why is resistance connected in parallel in galvanometer ammeter and not in series?

When we convert a galvanometer into an ammeter we connect the resistance in parallel, the only reason we connect a resistance in parallel with galvanometer is so less current passes and the flow of ...
Mathematition_From_Wallmart's user avatar
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1 answer
33 views

For intrinsic semiconductors, is the gap Energy equals $E_c-E_v$ or $E_c+E_v$?

So I have a problem with the intrinsic Fermi Level because by definition it is in the middle of the gap energy, and knowing that Eg=(Ec-Ev), we should have Ei=(Ec-Ev)/2. But when we follow the ...
anass bakour's user avatar
2 votes
1 answer
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How a switching mixer works in this example circuit?

I am reading about lock-in amplifiers and came across this example circuit of a mixer: You have one sinusoidal input signal $e_1$ with a phase $\phi_1$ and the local oscillator has a square-wave ...
NeonGabu's user avatar
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Holes near the junction on the n-side can readily float up the hill irrespective of their energy when the p-n junction is at equilibirum. Why?

Why does it not depend on their energy?
Ismail Warsi's user avatar
1 vote
2 answers
58 views

EM wave emission from earphone wires due to varying current signal

if we listen to some audio signal on a wired earphone, then does the wire of the earphone act as a transmitter antenna to emit the audio signal as radio waves even though its strength might be ...
sab's user avatar
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1 answer
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Saturation region of common emitter BJT

About the saturation region of common emitter Bjt it's written that In saturation mode both of the "diodes" in the transistor are forward biased. That means V(BE) must be greater than 0, and ...
Alex's user avatar
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When forming an n channel in an N mosfet, do the pn junctions of the drain-substrate and source-substrate parts disappear?

When forming an n channel in an N mosfet, do the pn junctions of the drain-substrate and source-substrate parts disappear? Here's what I expected: When gate voltage (higher than threshold voltage) ...
KHJ's user avatar
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1 answer
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Is the direction of base current always constant in a BJT transistor?

Is the direction of base current always constant in a BJT transistor? Excluding the transistor breakdown state, is the direction of the base current always the same in the four modes: active mode, cut-...
KHJ's user avatar
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1 answer
140 views

Voltage across the diode?

Why the voltage across an ideal pn junction diode remains 0.7 volts, even when the applied voltage exceeds 0.7 volts? Shouldn't it be the applied voltage minus the 0.7 V?
Alex's user avatar
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If an atom loses electron, it becomes a cation; it does not form a hole. However, when electron is lost from a bond, it forms a hole and not a cation

If an atom loses an electron, it becomes a cation, and when an electron is lost from a bond, it forms a hole. This is what the professor told the class, but I am not able to find the reason for that ...
Logan's user avatar
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1 answer
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What can cause a spot above my WiFi router's antenna? [closed]

Lately a weird dark spot has appeared right above the antenna of my wifi router. It wasn't there before. I have tried to wipe it and it got a little bit brighter but I don't think it's dust. My guess ...
Szil_K's user avatar
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1 answer
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Effect of Coaxial Cable Length on Capacitive Discharge

Summary: If I have a Capacitive Discharge through a coaxial cable to some load, how does the length of the cable effect the current felt by the load? I believe that the schematic breakdown for this ...
Squatchis's user avatar
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1 answer
30 views

How do changes in a video file during editing relate to voltage levels?

I’m trying to understand the relationship between video editing and voltage levels. For instance, if I trim the first 10 seconds of an MP4 video file or add an audio track, how are these changes ...
Madden Crush's user avatar
3 votes
1 answer
67 views

Can two laser diodes of the same type and wavelength, be synchronized to emit light in the same phase, while working in a CW mode.?

Can two laser diodes of the same type, power and wavelength, be synchronized to emit light with lightwaves in the same phase, while working in a continuous wave mode (CW) ?
Jimski's user avatar
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1 answer
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Why we are using coupling capacitor in AC amplifier? [closed]

Why we are using coupling capacitor in AC amplifier?
Akshai PS's user avatar
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1 answer
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Why my DC thick charging cable is slower than a thinner one? (having same power rating & adaptor)

Does that means thick wire cause more current loss than thinner one?
Aarav Raj's user avatar
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0 answers
11 views

Angular Velocity measured by a UGV on a curved path is equivalent to Angular velocity of UGV on a straight path

Pre-Condition An FOG IMU is mounted on a high speed Autonomous Vehicle to track linear acceleration and angular velocity of the vehicle under dynamic conditions, Here FOG Z axis (accelerometer + ...
Akash Sagar's user avatar
22 votes
12 answers
8k views

How do computers store sound waves just by sampling the amplitude of a wave and not the frequency?

All of this just doesn’t make sense though. I mean, doesn’t the amplitude represent the loudness and the frequency the pitch? Aren’t they completely independent from each other? Is the book just ...
RedP's user avatar
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1 answer
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Impact of photodiod's active area density on quantum efficiency?

The quantum efficiency is a factor, telling me the ratio between optical input and electrical output. So I wondered, how does the efficiency depend on the density of the photodiod's active area? I ...
iwab's user avatar
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0 votes
2 answers
118 views

Resistors in high frequency

My question is this: Can we use ordinary resistors like those we use in labs(1.2K ohm), in high frequency (like 4GHz)?
Hamidreza Moosavie Arsenal's user avatar
-1 votes
1 answer
169 views

Working of transistor

For the operation of the transistor, the base-emitter junction is forward-biased and the Base collector junction is reversed-biased. Due to the concentration gradient, electrons from the N side (...
Akshat Shrivastava's user avatar
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0 answers
49 views

Help understanding why built in voltage in PN junction created?

I was reviewing basic semiconductor physics and need some help understanding where my logic is incorrect. For a basic PN junction, the process of forming the depletion region is described as follows: ...
fordanjen's user avatar
-1 votes
1 answer
97 views

In four probe experiment why the graph looks like in low temperature

I found a graph between the log of resistivity vs inverse of temperature like this So in region 2, why is the graph going down?
Joy's user avatar
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-1 votes
2 answers
72 views

From the physics standpoint, how should I align a USB Internet stick relative to the nearest cell tower in order to have the best signal? [closed]

I use this USB Internet stick: (Huawei E3372h-153) To connect to the Internet, I simply insert a SIM card into this stick and then insert the stick into a USB port of my laptop. Based on my ...
Mitsuko's user avatar
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-1 votes
1 answer
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Isn't heating insulator enough for sufficient electrons to escape valence band and conduct electricity?

Diamond has about 5.5eV of energy gap, So If I heat diamond it will get atleast 1J energy which is enough to excite about 10^18 electrons, But Diamond still not conduct electricity, Why?
Knowledge Seeker's user avatar
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0 answers
42 views

Potential effects of magnets on a Police Taser?

I couldn't find any similar topics and was curious if anyone had thoughts on the following: Could a magnet (ceramic and/or neodymium etc.) have an adverse affect on a Police Taser, if held to the ...
Joe Vegas's user avatar
4 votes
4 answers
672 views

Load Lines and Characteristic Curves

While studying electronic circuits involving diodes, I came across the concept of characteristic curve, which relates the voltage drop in a diode with the current through it. However, I was also ...
V Govind's user avatar
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0 answers
22 views

Why do we still consider a doping concentration in undoped MOSFET devices?

I am studying cryogenic behaviour of MOSFET devices especially the evolution of threshold voltage with temperature. I mostly measure FinFET and FDSOI devices, all which have supposedly undoped channel....
Heomond's user avatar
0 votes
1 answer
71 views

About electricity flow through a diode

I have read answer of Vintage in 11 July 2011 on Krzysztof Lewko's question Why can electricity flow only in one direction through a diode? I appreciate very much this answer and i vote as "this ...
kraka's user avatar
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1 vote
1 answer
292 views

Carrier concentration on forward biased pn-junction

I understand that when a pn-junction is forward biased minority carriers accumulate and form an exponential charge concentration in relationship to the distance from the junction, as the figure below ...
João Pedro's user avatar
1 vote
0 answers
27 views

Does the built-in potential inside a diode change by making bias?

under thermal equilibrium the pn junction have a built-in field let say it's $E_{1}$ , if we make a reverse bias the external battery provide a permanent field $E_{2}$ , so the total field inside the ...
amin's user avatar
  • 597
0 votes
1 answer
56 views

How does surface area relate to the Seebeck Equation?

I know that the equation is $$V = (S_B-S_A)(T_2-T_1),$$ but surely this output voltage must be proportional to the surface area (and probably thickness) of the Peltier device. What is the formula that ...
neuman's user avatar
  • 1
2 votes
0 answers
38 views

How the potential difference (PD) between two electrodes changes with electrolyte concentration and distance? [closed]

I set up the following experiment I keep the black probe fixed to the left electrode. I moved the red probe at different points. I measure a voltage, basically the potential difference (PD) between ...
Krivan Semlani's user avatar
0 votes
3 answers
64 views

Continuity of current through inductor

I also know that sudden change of current is impossible as $V=L\frac{di}{dt}$, it makes infinite voltage. But is there any other explanation about it?
KHJ's user avatar
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1 vote
0 answers
123 views

How does a simple AC circuit radiate?

Introduction I'm sure a lot of us have seen the controversial video made by Veritasium: The Big Misconception About Electricity Now what I want to ask in this post is not to argue about any of the ...
JY _Decipherer_'s user avatar
1 vote
1 answer
34 views

What are some ways to generate energy in a poi?

Poi are tethered weights used for dancing, which often have battery powered lights in them. Clearly work is being done on the poi, first to accelerate them, then to keep them going at constant ...
Davis Yoshida's user avatar
0 votes
1 answer
66 views

Leakage current in capacitors & the resulting voltage drop

When capacitors are connected in series in a DC circuit, the voltage drop across individual capacitors at and immediately after the initial charging period is inversely proportional to the individual ...
Duke William's user avatar
0 votes
1 answer
88 views

Do aluminum electrolytic capacitors expire?

Aluminum electrolytic capacitors are a type of capacitor that uses an electrolyte as one of the electrodes. The electrolyte is a liquid or gel that contains ions that conduct electricity. The ...
Duke William's user avatar
0 votes
2 answers
48 views

Can computers recieve data wirelessly without being powered? [closed]

I'm not sure if this question totally fits here, but I think this is the best SE for it. Traditionally, to connect to the internet (a server), a computer must be on: powered and running. This means ...
Andrew Baker's user avatar
0 votes
1 answer
47 views

Current Amplification in Common Base Transistor

How does a common base transistor amplify current if a small part of its emitter current gets divided into base current and the rest goes to collector current? If the input signal is applied to the ...
Cyber1ite's user avatar
0 votes
2 answers
67 views

Are wide-range EMPs (that knock out electronics) possible? Or is that just in hollywood/fiction?

In movies like GoldenEye, they talk about how detonating a nuke in the sky will disrupt all electronics. My question is: is disrupting all electronics in a significant area (the size of a small city) ...
chausies's user avatar
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0 votes
0 answers
37 views

Graphene characteristics

I am trying to understand the physics of graphene and was unable to understand its I-V characteristics. Could anyone please explain it in simple terms. I have gone through the papers online but couldn'...
prashanth's user avatar
1 vote
1 answer
134 views

Applying the equipartition theorem to charge on multiple capacitors

I asked this question here on the Electronics stack exchange, but it may be better suited here since the core of the question is about the application of the equipartition theorem to the charges and ...
Halleff's user avatar
  • 197
0 votes
1 answer
24 views

Viability of generators and electromagnetics based solely on ionic liquids

The background to this question lies in the science fiction novel "The Day the Machines Stopped" by Christopher Anvil (1964), where somehow an experiment gone wrong causes the laws of ...
Ron Kaminsky's user avatar

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