Questions tagged [electrical]
The electrical tag has no usage guidance.
301
questions
0
votes
0answers
34 views
How does your country evaluate power quality (standard procedures)? [on hold]
How does your country evaluate Power Quality? Do you have a standard procedure available online? I'm working on my final engineering project regarding the development of a PQ monitoring, assessment, ...
0
votes
0answers
8 views
Pulsing issue in HV push-pull MOSFET switch
I am trying to pulse a high voltage push pull MOSFET switch HTS-201-03-GSM (behlke make) to drive a non inductive resistor load. The low voltage and high voltage side is galvanically isolated to 30kV. ...
0
votes
1answer
26 views
Does magnetic flux depend on the orientation of the ferromagnetic rotor?
I have attached a picture of a reluctance motor setup. When I turn on the AC source, magnetic flux lines will build up.
My question is, will the magnetic flux will be a function of the angle turned ...
-5
votes
0answers
27 views
Regarding information about GPS receiver [on hold]
I want get gps location data inside room in Linux without using any software by directly using linux commands.
So I am planing to buy some usb gps receiver.It will be helpful if anyone guide me for ...
-7
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0answers
26 views
Role of VDU in Modern Power System [closed]
Role of VDU in Modern Power System operation?Draw and explain a typical layout of VDU
0
votes
1answer
80 views
How to build a programmable LED strip? [closed]
I'm trying to build a home-made LED strip (non-RGB). It will be using single color SMD chips in array. The thought I have right now is to have 3 rows, each with about 15 or 25 same single color LEDs, ...
0
votes
1answer
50 views
3 phase heater to Single phase
I have this big immersion heater which my friend gave this to me. He said that this is originally design to be a 230V 9kW 3ph immersion heater (star).
I am planning to convert this to single phase.
...
0
votes
1answer
45 views
Are these valid transformations, Please guide
Please help check if the transformations in the pink are allowed, when solving a circuit. For the given circuit the goal is to find the current I1 which could be found using nodal without taking care ...
0
votes
2answers
36 views
Voltage gradient in voltage difference across a resistor
If I have a voltage difference V from terminal 1 to terminal 2 of a resistor.
I take an arbitrary point P along the resistor, between terminal 1 and terminal 2, and take terminal 1 as a voltage ...
0
votes
4answers
79 views
Why choose a PMOS over an NMOS or vice versa?
I know it sounds dum and that I sound dum but theres such a large amount of MOSFETs out there, there are N-channel and P channel devices that have extremely similar functionalities, capabilities, ...
0
votes
2answers
101 views
0
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2answers
38 views
Echo in voice to the caller while receiver with headphone hving wire replace [closed]
Hi I just replaced the old wire in my headphone with new one.But while using headphone the caller hears the voices with his own echo but while me having headphone on has no issue of echo can speaks ...
0
votes
1answer
46 views
Help finding voltage between two points
So, how should I proceed to find U_ab (or V_ab)?
I have found I = -0.5mA, U_1=-2.5V, U_2 = -0.5V, U_3 = 2.0V.
How would I even find U_a and U_b separately so I can apply U_ab = U_a - U_b?
Also, ...
-3
votes
1answer
64 views
Please help reduce the following circuit to an equivalent circuit with single resistor and source
Please help reduce the following circuit to an equivalent form as I am unable to understand the given solution in the book. If required I will share the solution later.
Thanks in advance.
@jonk, @...
0
votes
1answer
46 views
Earth Leakage current understanding
In our design used TRIAC to control the load, As per the product field test setup i should short the neutral and earth connect together also the digital GND is connected with chassis.
The input AC ...
0
votes
2answers
92 views
PCB trace width
I am trying to design a PCB circuit in altium designer.
My circuit consists of one ATmega8a, one NRF24l01 and three magnetic relays (mini relay 12V MPR-S-112-A.)
I want to set the trace width to 0....
1
vote
0answers
28 views
LCD Dimmer with Variable Resistance Circuit
essentially I'm trying to make a very basic circuit where a 3.7 volt battery is wired to a liquid crystal display, (or LCD), and the brightness of said display is controlled by a pentiometer to ...
0
votes
2answers
106 views
Is there a way to trade off amperage for voltage? [closed]
I was planning on buying a motorcycle battery or some other large battery to charge my laptop, but most of the batteries I found are 12v or lower, and I need around 20v to charge my laptop. Is there a ...
0
votes
1answer
35 views
Flyback Converter Transformer Leakage Inductance
We are in the process of designing an inverter , in which designing a step up flyback converter is crucial.
The problem, we initially faced was there were more step down transformers available than ...
0
votes
3answers
79 views
What happens when we connect battery to a circuit?
Example setup:
I have a piece if metal and I have 12v battery. When battery is connected to the metal current flows through the metal.
So, my question is, does electrons from battery move through ...
0
votes
1answer
67 views
Isolation transformer Confusion
I’m hoping someone can clear up some confusion.I understand how an earth reference transformer works and how if there was an earth fault there would be a large rush of current through ground and back ...
0
votes
0answers
26 views
How to develop Differential Conductance dI/dV measurement setup?
I have a Lock-in as sinusoidal Voltage source, DC Current source and Multimeter.
Can you please help me to develop a functional setup for dI/dV measurements.
How can I design the circuit?
What ...
0
votes
1answer
38 views
How to Measure differential conductance dI/dV experimentally?
Numerical derivation of IV curve is always a possibility to deduce dI/dV graph.
How to measure it directly in voltage bias mode?
What concept is required for it?
What instrument are required to ...
0
votes
3answers
92 views
Wind turbine charger controller
I need help on my design which includes a wind turbine, charge controller, battery and load.
The question is, what will happen to the load if the wind turbine is charging the battery and while it is ...
0
votes
2answers
36 views
Looking for Connection Ideas for 12V Battery Pack
I'm working on a project that's requiring the use of a battery pack made from 18650s. 3 of them in series connected to a BMS. It's a 12V supply that is housed in a 3D printed part, length wise of the ...
0
votes
1answer
41 views
SPI pins logic level issue [closed]
I have ESP32 and the popular dot matrix module MAX7219 8*8 module to interface. It is connected through SPI pins. After a sample word printing on the maxtix it shows garbage outputs. Is it happening ...
0
votes
2answers
60 views
Why we see a spark when we connect a plug into an already switched “ON” socket?
Why we see a spark when we connect a plug into an already switched "ON" socket? But I've also noticed that this isn't the case always, ie. sometimes when connecting a plug into a socket which is ...
1
vote
1answer
54 views
Does these terms consider the same Voltage, electric potential, and potential difference
What are the differences between these terms ? do they are considered the same
1
vote
1answer
29 views
Gain of a Dual Gate MOSFET
simulate this circuit – Schematic created using CircuitLab
This is the schematic of the circuit but tried to find the gain of this circuit, assuming 50 % of the Duty Cycle for the LO, and M2 ...
0
votes
1answer
62 views
Can not recognise this piece of equipment. It is attached to the mains
It is normally quite noisy, but has gone silent.
1
vote
3answers
102 views
Testing and safety requirements for selling homemade electricals
I am currently researching and designing electrical audio equipment, example devices:
Tube and solid state guitar amplifiers
Guitar effects pedals
Mixing / filtering units
Synthesizers
Some of these ...
0
votes
0answers
38 views
Ballast Power Draw
I am trying to calculate the current draw for 6 florescent bulbs and ballasts. There is one ballast per 36W bulb.
I know that the current draw for each bulb would be 36/240 =0.15A (0.6A total)
How ...
0
votes
3answers
64 views
220V/1ph/60Hz equipment to operate on 208V/3ph/60Hz
Can an equipment built for 220V/1ph/60 Hz be connected to a 208V/3 ph/60Hz grid by using only two lines of the 110V each across the load?
0
votes
1answer
57 views
AC noise to electronic circuitry
I find some random issues that is still unknown. I'm using mean well SMPS 12v, 3A for supply and charging 2 cell battery 7.4v with a charging current 1.2A. The supplies are parallel which is switched ...
0
votes
5answers
124 views
Voltage signal and Current Signal
Please give an intuitive explanation of difference between how a signal or data is carried using voltage and current?
I'm wondering even though current and voltage inevitability co-exist, why do we ...
0
votes
2answers
36 views
Contact on substrate of a MOSFET
Why do we want to have an ohmic contact on a substrate terminal of mosfet? What would happen if we used schottky contact instead?
1
vote
3answers
121 views
why is transformer not considered as an amplifier?
I know that in a transformer the power is conserved on both sides, and hence there's no power amplification as such. That's fine!
But if I instead want only a voltage amplification, then choosing ...
-1
votes
1answer
72 views
Can you connect transistors directly to high voltages or is there precautions neccesary?
I understand that the circuit above will simply work, but what if the voltage input from the battery is significantly higher and the necessary voltage for the motor is high as well? Can you still ...
1
vote
3answers
242 views
Dependent voltage/current sources
I'm so sorry for that questions, but we need to understand what's going on behind the concept/theoretical of using device "dependent voltage/current source"!
My question: Yes, we are using dependent ...
0
votes
1answer
26 views
Choosing the appropriate power plug for a given fan motor
In a fan motor I have, the written specifications are as follow :
"dual power: 110/230v 50/60Hz 22/20w".
I would like to power the motor directly, without electronic parts between any 220V wall ...
1
vote
1answer
30 views
The best way to test a solar panel generation
Is there any way to test how much a solar panel on a given position can generate for let say a day or few days. Like a multimeter that can automatically test the wattage days example? Or create a ...
2
votes
0answers
27 views
Switchgear dielectric testing and impulse polarity
What is difference between negative and positive polarity impulse test? Why Negative only done for internal dielectric strength and positive polarity impulse only for external dielectric strength? ...
0
votes
2answers
44 views
shorting method of current source and voltage source
I'm learning electronic circuit and sometimes we need to short just the current sources and sometimes we want to short source voltage. my question is: why if I want to short the current source then we ...
0
votes
1answer
52 views
Find rotor stator loss in a 3 phase delta connected induction motor?
I'm trying to work out stator input power of a 3 phase delta connected induction motor.
I have the equation Stator Input Power (P1),
where P1= Pm + rotor copper loss + rotor stator loss.
I have Pm ...
0
votes
2answers
93 views
Should startup torque be higher in value than full load torque in an induction motor?
I found out values of my 3 phase delta connected induction motor for full load torque, maximum torque and startup torque.
My maximum torque was higher than my full load torque, but the thing I'm ...
1
vote
1answer
74 views
Torque in a 3-phase delta connected induction motor
I know the equation for torque is
T=[m*(N2/N1)^2/2*pi*Ns]*[s*E1^2*R2/R2^2+(s*X2)^2]
N2/N1 is the effecting rotor-stator turns ratio. I have it written ...
1
vote
1answer
52 views
Finding value of slip in an 3-phase delta connected induction motor
I know the equation for slip is
s= (Ns-Nr/ns)x100
and that to find Ns is
Ns= f/p.
I have been given ...
0
votes
0answers
18 views
How does electrical noise affects signal and distribution power?
What is electrical noise and mechanical noise
How does it interfere with power?
- signal power
- Power distribution/ transmission
0
votes
2answers
67 views
How to apply supermesh to this?
Since there is a current in the circuit, supermesh is much preferred. However, how do I do that as the current source is not in between 2 loops? Do I just open circuit at the current source and I will ...
0
votes
1answer
34 views
Soldering back the disconnected wires from the charger board [closed]
The attached link images are the front and back photo of the board inside my charger. This charger is used to charger my son's toy car. Unfortunately, the wire soldered on this chip got disconnected. ...
