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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.

0
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2answers
34 views

Is it correct to say that a smartphone cable is only a “1A” cable?

A store owner said that some lower quality smartphone charging cables are only "1A cables", so if you want 2A, those cables won't do the job. Is it correct to say a cable is only 1A? Does the metal ...
-1
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1answer
33 views

Why can I hear the treble sounds through a speaker, such as on my phone, better than I can with headphones?

I'm not sure if this is related to my hearing loss, or if anyone else has noticed it, but I find it easier to hear higher frequency sounds coming out of a speaker that I hold up against my ear versus ...
0
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3answers
49 views

Non-ohmic conductors

Non ohmic conductors are said to be the conductors that do not obey Ohm's Law. The V-I graph for them is not a straight line unlike ideal ohmic conductors. According to me Ohm's Law states: The ...
0
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0answers
10 views

Possible to develop touch screen material in wrap form? [closed]

Does anyone know if it's possible to find/create the same material found in capacitive touch screen in bulk form? I'm looking to wrap a number of inanimate objects completely in touch screen capable ...
0
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1answer
23 views

How does a sound box amplifier work?

I read in a few places that in a guitar for example, the vibrations are passed through the connectors to the wood and the wood with its bigger surface is more efficient as a coupler to the air, ...
0
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0answers
22 views

Determination of read/write lifespans of NAND drives [migrated]

I check around and there are various numbers for different manufacturers solid state drives as read and write life terms. At the very fundamental level input/output speeds of these devices are pretty ...
0
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2answers
17 views

Principle of potentiometer

I could not understand why the emf of the main cell (labelled E) in the circuit (can be a battery eliminator) should be greater than the emf of the cells (E1 and E2) used in the secondary circuit. ...
0
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0answers
6 views

BJT as a switch: what am I doing wrong? [migrated]

I'm studying the following circuit The image is explicit but as you can see the input measured in the upper terminal is a square wave with $E_c$ and $-E_c$ as levels. Now I also had no trouble ...
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0answers
17 views

Capacitors in Amplifiers [migrated]

I am reading about single stage CE Amplifiers and I don't understand how the capacitors work here. 1) Coupling Capacitors: "The coupling capacitor is used to isolates the d.c. of one stage from the ...
1
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0answers
16 views

How to produce Sratic RAM using 10nM technology [closed]

If I want to produce 2GB SRAM module using 10nM or smaller than 10nM technology, what should I do? Please state step by step and also how much would it be?
1
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2answers
53 views

Why can’t light induce a current while microwaves can? [duplicate]

Microwaves can induce current in a coil of wire why cant visible light do the same?
18
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0answers
2k views

How is it that two electric currents can travel in opposite directions on the same wire, at the same time, without interfering with each other? [migrated]

I asked this same question on electronics.stackexchange, but the answers either don't clearly and directly address my question, or are seemingly conflicting or greatly varying to the point that it is ...
2
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0answers
40 views

Is there a physical limit to memory reading and writing speed?

Is there a limit to the speed at which a memory, quantum or classical, can be read or written into? I've seen this interesting question : Is there a physical limit to data transfer rate?. Here I'm ...
0
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1answer
22 views

Defining potential of the ground

In electronics, it is customary to define the potential of ground (thinking the Earth as a large conductor) as zero. Is this consistent with the fact that the Earth has a net electric charge that is ...
-1
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0answers
18 views

Speed problem in inductance calculus

I made following two routines to calculate mutual inductance of coils in the same axis. The first uses the first and second kind elliptic integrals (uses boost or C++16) and the second uses AGM ...
1
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0answers
11 views

Why is the maximum voltage applied to the coil different when disconnected from the battery?

In this RL circuit, the time to reach the point V=0 (after the switch was turned to (a)) was about the same as the time after switched to (b). But my teacher says, (in the experiment) peak voltage ...
0
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1answer
18 views

Error of capacitnace measurement using a multimeter

physics stack exchange Many multimeters have a setting for measuring capacitance. The multimeter I have has a precision of four significant figures, or in other words, it returns the value in the ...
1
vote
1answer
33 views

mechanical analogy to signal propagation on coaxial cable

EDIT: The analogy is wrong if we think of voltage propagation, I confused and in the eletrical signal, it actually happens contrary to what the analogy predicts. However, for current, it holds. I am ...
0
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1answer
34 views

How do multi-meters measure capacitance?

Many multimeters have the ability to measure capacitance along with the ability to measure AC voltage, DC voltage, current, resistance ... The only equations I am aware of that determine capacitance ...
1
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2answers
43 views

Need of LED Modulation

I have an experiment of calculating the velocity of light by using phase difference produced (link of the experiment is at the end). The experiment has a control unit which has an LED installed to ...
1
vote
0answers
40 views

Why the product of hole and free electron density is constant in semiconductor?

I have learned from a text book of electronics that the free electron density, n (which is equal to that of hole, p) of intrinsic semiconductor due to thermal excitation is a function of temperature ...
1
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0answers
48 views

Calculating length of stretched wire (before and after) based on resistance

For a university project; I'm interested if I can accurately calculate the lengths of a wire (or any electrical conductor) before and after stretching. I understand that there are multiple factors ...
0
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2answers
56 views
0
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1answer
47 views

Accelerometer readings

Good Night. I have a implemented a accelerometer, a gyro and a Magnetometer in raspberry pi. I want measure the linear acceleration (acceleration without gravity) but i don't know how to do it or if ...
1
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1answer
47 views

Imprecision in experiments

When dealing with breadboards, and electronic circuits in general, in my case finding the total (equivalent) resistance using an ohmmeter, what are the factors that make the experimental value not ...
-3
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2answers
431 views

Confusion on AC in LIVE & NEUTRAL WIRE

So if an AC current means the elctrons are alternating or changing direction in a given time, how does this apply to live & neutral wire, don't they flow in one direction only? Please answer it as ...
0
votes
1answer
26 views

What does ground in low voltage electronic circuits mean?

I have been confused a lot by the word "Ground". The ground that I've usually heard about is connecting a wire of appliances with the rod buried under earth but what does the word Ground mean when it ...
1
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2answers
62 views

How could a bulb light up if aĺl the voltage is lost in the resistor?

I recently came up with this slight confusion about voltage loss in resistors/resistance. So for example My circuit has a 12V battery, a 2 Ohms resistor and a Bulb. If we use the V=I.R formula then a ...
2
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0answers
25 views

Conductivity of a heavily doped semiconductor at Absolute zero temperature

As the Fermi level moves toward the conduction band in an n-type semiconductor; when heavily doped, it moves into the conduction band of the semi conductor. So, will the semi conductor behave as a ...
-2
votes
1answer
46 views

Bjt configuration

In common base configuration,we know that alpha is almost 1 which means that the base current is almost zero.But what is the physics behind this base current almost equal to 0?And similarly in common ...
-2
votes
1answer
50 views

Ohm's Law in Practise [closed]

When the AUX pin of a stereo is connected to my mobile phone's audio female port, I just measured the voltage at the end of this AUX pin (No load is connected) approximately 2mV using a DMM. But when ...
4
votes
2answers
651 views

Why does sticking a knife into an operating toaster give you a shock?

I understand why sticking a knife into a toaster produces an explosive phenomenon. It completes the conductive connection between the two holes in the electrical outlet and the 250 volts or so that ...
1
vote
1answer
61 views

How can depletion region be formed at the center?

Let's consider an electron at the junction in the n-type region. As it moves into the p-type we say it leaves behind a positive ion and hence in this way electrons at the junction in the n-type create ...
1
vote
2answers
76 views

Existence of conduction electrons in pure Si at room temperature

Silicon has a bandgap of ~1.1 eV whereas the room temperature thermal energy is ~0.04 eV. But we still find electrons in the conduction band for a pure silicon wafer, away from any radiation. I ...
1
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1answer
56 views

Who controls completing the circuit in a transistor? [closed]

Consider an npn junction. The p-type semiconductor p has holes which are filled by electrons provided either by the n-type or by phosphorous dopants. The transfer of charge from n to p forms a ...
1
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0answers
27 views

What is the resultant resistance of the circuit [closed]

If all resistants have a resistance of $R$, find the resultant resistance between points $AE$. My Try: Since Points AB and AC have equal resistance, There's an equal current flowing through each ...
0
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0answers
16 views

How to decide the resistance required to power a LED using triboelectric nano-generators?

I tried to power LEDs using triboelectric nanogenerators, https://youtu.be/OAmpvhRE4Ws, but found that I was unable to light even a single LED. Do it requires to connect resistors in series with LEDs ...
0
votes
1answer
42 views

Voltage across different power sources and transformers [closed]

Something cause a potential difference between the two poles of a power source. The same kind of 'something' of two different power sources may also cause a voltage between those two different power ...
0
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0answers
11 views

Noise in AC/DC coupling devices

I what is the reason why we perform AC coupling of electronic devices for particle physics. I was told that it is because the noise is lower, but I do not know why this is the case.
0
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1answer
23 views

Limit charge of electronic–hydraulic analogy of a compartment

I am doing a mathematical model of an hydraulic system and I am using an electronic-hydraulic analogy. Normally a compartment is simulated with a capacitor. But in my system I can apply a big ...
0
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0answers
14 views

What are major differences in band like electron transport and hopping transport mechanisms ?

How can we differentiate between the transport mechanism for a molecular system through theoretical calculations ?
0
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1answer
52 views

How does the centre tap of a **centre tap transformer** at zero volts?

As per my knowledge, the secodary coil will have one terminal at positive and another 0(zero) at one instant, and at another cycle, the other terminal becomes positive and the first one become 0(zero)....
2
votes
1answer
66 views

Why are the active noise cancellation headphones subjectively better in reducing “periodic” noise?

According to experience of mine and of my friends using active noise cancellation headphones, the technology is much more efficient in reducing "periodic" noise, such as humming of jet engine, fridge ...
0
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0answers
37 views

What are resistive electrodes?

I am reading an article, "Signal, Noise and Resolution in Position-Sensitive Detectors," by V. Radeka. In the article, the author mentioned about resistive electrodes. I have seen the same term in ...
0
votes
1answer
117 views

How does base-emitter voltage affect the current gain of a transistor?

I'm doing a Physics project related to transistor operation. My data shows that as the base-emitter voltage drop increases, the current gain of the transistor rises and eventually plateaus at a ...
1
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0answers
31 views

How do electrons move in an ac circuit? [duplicate]

In alternating circuits, voltage changes polarity very fast. Current is opposite to the flow of electrons from negative to the positive terminal. How do electrons really flow in such circuits? At one ...
0
votes
1answer
55 views

Internal resistance and a resistor as a potential divider

Based on the fact that batteries have some kind of internal resistance, if I had a circuit that consisted of a battery and a resistor of some kind would they act like a potential (voltage) divider? ...
0
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0answers
22 views

Band theory- Is the conducting band the last orbital with a gap between the two bands?

What I understand is in each atom there are conducting and valence bands and the valence band, the minimum level for electrons (is the orbital before the last) Is the conducting band the last ...
-1
votes
1answer
70 views

Voltage drop across an inductor in a RL circuit

for a circuit that has a resistor (resistance R), and a inductor (inductance L), that are connected in series to a source of AC electromotance. How do I find the voltage drop across the inductor in ...
2
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2answers
74 views

What is the need of term 'closed circuit'? [closed]

If a circuit is a closed path in which charges can flow then why do we have the term closed circuit? Doesn't the definition mean that a circuit is always closed.