# 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.

688 questions
Filter by
Sorted by
Tagged with
20 views

### Getting Energy consumed by using the Gradient of the Power

My goal is to predict the energy consumption in Wh over a time window by using the current power draw and the current gradient of this power draw. In other words, if my power usage is increasing at ...
• 21
42 views

### Would an OLED display work in the vacuum of space? [closed]

A recent EE advertisement for the iPhone 14 features a scene of Kevin Bacon using the iPhone in space: https://youtu.be/3GnpsXtNX3E?t=15s In the film The Martian, Mark Watney destroys his laptop by ...
7 views

### OrCad Capture Lite [closed]

In which library can resistor be found in OrCad Capture Lite?
17 views

### Is there a strategy for reconstructing a circuit given the frequency response? [migrated]

So I recently worked with a problem where I was given a bode plot where magnitude of the transfer function (the ratio between the output and input voltage) was plotted against frequency of the system. ...
• 309
1 vote
13 views

### How do I find value of $I$ using Node Voltage analysis method? [closed]

How do I find value of current $I$, using Node Voltage analysis method ?
• 11
30 views

### How to derive Thevenin Voltage formula using Kirchoff laws?

Here's a simple voltage divider. I'm learning Thevenin Circuits now and we use the formula for Thevenin Voltage a lot (very useful!) but I'm not sure how the formula arises. My professor said I can ...
• 1
52 views

### What are occupied states in a semiclassical context?

I've been reading this question and the answers it received, and I still have some unresolved questions. It is common to use the semiclassical approximation in describing charge carrier transport in ...
• 31
13 views

### Construction of transistor using diode? [migrated]

Construction of transistor using diode? Can we use diode as an transistor, I have gotten a assignment to give a presentation on this, I’m unable to understand the question and would like help from the ...
27 views

### Hole concentration distribution in MOSCAP

For a given p-type MOSCAP energy band diagram, I was asked to sketch the distribution of holes with respect to position. I understand why the hole concentration at the interface is $10^{10}/cm^3$ and ...
81 views

### How does RGB really work with subpixels?

first off, I’d really appreciate any help. I have googled relentlessly to try to understand this, but I’m too stupid to fathom it. Please attempt to explain this to me in plain English if you can. I ...
1 vote
113 views

### How do you solve any partial differential equation using equivalent circuits? How is this possible?

Here's the quote from this wiki: In 1945 Kron suggested an approach to Schrödinger's equation with networks. The same year he used equivalent circuits to solve differential equations. So I've been ...
• 111
17 views

### Modified Bridge full wave Rectifier output [migrated]

In the circuit diagram of the full wave rectifier given, if a diode D is connected between points X and Y, would the Output Voltage vs Time graph be different from that of the unmodified diagram?
• 1
2k views

### Does a Mobius resistor have zero inductance? How would you calculate the inductance?

Wikipedia describes a Möbius resistor as follows, and the Patent for this device gives a similar description. A Möbius resistor is an electrical component made up of two conductive surfaces separated ...
• 559
23 views

### What factors determine the suction of an exhaust fan?

What factors determine the suction of an electric exhaust fan used in kitchens? I thought about fan-speed, voltage, air-pressure, difference in air pressure, circulation.
2k views

### Why is it easier to raise AC current to high voltage than DC?

In my country (and maybe all around the world I don't know) once electricity has been generated, it is then raised to 200k Volts for transportation. I know this is to reduce the loss. Given $P=U.I$ ...
• 201
78 views

### In the equation below for root mean square voltage, I don't understand how the $1/T$ came in, and how that equation was even derived [closed]

$V_\mathrm{peak}$ is the maximum voltage. $V_\mathrm{rms}$ is the root mean square voltage. $T$ is the period, $Φ$ is a shift in phase, and $t$ is the time interval. The other letters have their usual ...
25 views

### Actual power consumption of an irregular measure (GPU/CPU) [closed]

Hello and my apologies if this is off-topic or really too basic. My math and physic days are really far far away.... I want to measure the energy consumption of both the GPU and CPU of a computer ...
25 views

### Why does increased temperature increase resistance but decreases internal resistance?

I read that increased temperature increases the resistance because the lattice of metal ions (if we're talking about a wire) vibrates more and so more collisions occur between the electrons and the ...
26 views

### Does Radon Gas Worsen The Effectiveness or Usability of Consumer Grade Wireless Electronics? [closed]

Some notes: I don't have a Geiger counter. The wireless headset is near my computer. It goes in and out of the audio signal. The audio has audible cracks that sound like a Geiger counter. My family ...
1 vote
35 views

### Regarding Kirchoff's Loop Law

I heard that the reason Kirchoff's Loop Law (also called Voltage Law) works is because of the conservation of energy, or more precisely, as the electromagnetic field is a conservative field, the ...
47 views

### Why do we use tin in extreme ultraviolet (EUV) lithography?

I am in awe of what we have achieved with EUV light, and like to think about it in my free time. One question that I have is: What are the calculations that point us toward tin as the best EUV light ...
• 21
23 views

### Will both electrons in a broken bond move to the conduction band?

Consider a silicon semiconductor at room temperature 300K. A bond constitutes of two electrons. So if a bond is broken will the two electrons in it moves to the conduction band? Or is there a ...
• 91
11 views

### Can a fast ammeter measure the contact current (and associated voltage) between two different metals?

Suppose I have 2 metals with different standard electric potentials. It is commonly taught that, without completing the circuit (e.g., by immersing the 2 metals in aqeous solution and adding a salt ...
• 365
14 views

### What is the relationship between Diode Junction Current and the Fermi-Dirac probability function?

The equation for the Fermi-Dirac distribution function is $$f(E)=\frac{1}{e^{(E−E_F)/k_BT}+1},$$ and can predict charge neutralization. How is this applied to a diode's junction current and can this ...
• 411
1 vote
34 views

### Comparison of 2 fans [closed]

I have 2 20" box fans. The first fan draws .65 Amp and claims 1780 CFM. The second fan draws .45 Amp and claims 2300 CFM. The fans are new, and the electric motors are of similar design, so I ...
• 13
33 views

### Solar Cell Power

I'm interested in doing a rough approximation for a solar cell efficiency under different input spectrums. I know the EQE of the cell and the IV curve under AM1.5 conditions (easy to find online). I ...
• 649
1 vote
42 views

### How can I determine how much energy a sensor pixel can withstand before exploding? [closed]

I am trying to design a camera system to image a laser beam. I know the sensor is a Sony IMX226, and I have the data sheet for this sensor. The data sheet, however, does not list a maximum energy ...
1 vote
28 views

### Understanding alpha and beta factors in transistors

I am a student and this is first time we are introduced to semiconductors. During studies I learned about the alpha and beta factor in a transistor. Actually I was doing some numericals were I got ...
• 121
49 views

### What could be the cause of a limit in the voltage supplied to a capacitor?

Recently I built a very basic 2-stage coil gun for a school project. Each coil was powered by an electrolytic capacitor. In order to charge the capacitor, the coil connected to an IGBT (insulated-gate ...
17 views

### Pulse Area Uncertainty for a given Sample Rate and Bit Resolution

I'm recording pulses and want to approximately know how precise I can measure this with my Oscilloscope. I'm recording with 15 bit vertical resolution -> 1/(2^15) and a sample rate of 125 MS/s ->...
27 views

### Potential distribution in MOSFET

Let us assume that an NMOSFET has its source, drain and substrate grounded therefore VDS and VSB=0 V . We apply a gate voltage VGS=2 V and I want to know how this potential is distributed as we move ...
1 vote
86 views

### Trouble understanding physics behind MOSFET body effect

I’m struggling to understand why a negative voltage applied to the bulk contact of an n-type MOSFET increases the threshold voltage. I can see why it happens due to the equations, but I can’t wrap my ...
• 13
12 views

### Good braking system for a mini car that can be triggered by a beam above the car that it will go past

I want to create a braking system for a mini car (essentially an aluminium body around 30cm long with 2 sets of axles with wheels (laser cut circles) connected to the end of each axle on the front and ...
74 views

### What can I give as an example for a dumb instrumentation system? [closed]

I've searched through many websites and textbooks but none of them have given an example for a dumb instrumentation device.
1 vote
29 views

### Why are most solar panel rated at 12 volts or 24 volts? [closed]

Most solar panel come in 12 volts or 24 volts, why?
422 views

### I’m trying to charge a capacitor. Would a bridge rectifier charge it like a battery would?

Since a bridge rectifier converts ac to dc. Will this charge my capacitor to max capacity how hooking it up to a battery would? The positive is charging the anode, while the cathode is grounded. Any ...
56 views

### Questions regarding physical electronics [closed]

I ran into some questions while studying physical electronics. My textbook/lecture note says "An electric field applied to a semiconductor will produce a force on electrons and holes so that ...
• 461
21 views

### Fluctuative current and voltage graph shown by LabQuest 2

I was in physics class and was tasked to measure current and voltage of a circuit using LabQuest 2. The circuit was connected to a battery, which means it's a DC circuit. But when I use the LabQuest ...
• 55
80 views

### Why there is no current when diode ia reversed biased?

I try to understand why, really, there is no current (except for leakage) when a diode is reverse-biased. I studied several texts, and noone really explains, like for instance this otherwise very ...
14 views

### How is ballistic transport detected/measured experimentally?

That is, measuring the current and calculating the resistance for conducting materials of extremely small size and short paths(such as nanowires for example). How is this done in a laboratory?
• 391
54 views

### Is this actually a Group II, Group IV transistor? What should its properties be?

This question is for more than a theory. I would like to disprove that what I'm working on is not a Group II, Group IV transistor. I know they CAN exist. I don't know why they don't exist or what ...
79 views

### In a series DC circuit, how can one show that the current at each point is same mathematically?

This question has been asked more than ten times in this site before, but almost all of the links I Found are based on informal intuitive argument. In this post, I am asking if it is possible to show ...
• 6,080
145 views

### How does putting a resistor change potential difference between two points?

Suppose that we have a closed circuit that consists of a single wire. If we said that the wire has resistance $R_1$, then the electrons would travel through the wire and the potential difference ...
• 818
1 vote
68 views

### Uncertainty of output current in voltage-current converter

I have a problem comprehending some things about uncertainty in electrical measurements. Here is illustrative example from my textbook. We use voltage-current converter for measurement. U1 = 10V, I2 =...
• 111
92 views

### Conceptual doubt about voltage drop in a diode

In the given circuit, I am not sure how to solve it, I know that due to the current the diode is in reverse bias, hence no current should flow through it, But the answer is not given that and a finite ...
• 167
32 views

### How and why does a nonlinear element produce the sum and difference of two radio frequencies?

For a resonant circuit the voltages of the capacitive and inductance reactance cancel and the currents of the capacitive and inductance reactance also cancel leading to a zero reactance. Is there a ...
228 views

### Lamp specifications

So when a lamp has a specification of 24 V, 5.0 W, does it mean that it requires at least 5.0 W to work? Can it still consume more power? Or would it then fail? If for example a power supply has ...
6k views

### How do headphones and earphones produce good bass if tiny speakers can't produce low frequency sounds very well?

It's a well known fact that small/tiny speakers cannot produce low frequency sounds very well. Conversely, large speakers cannot produce high frequency sounds very well. Hence the need for tweeters ...
• 761