Questions tagged [electrical]
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458
questions
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What is the process behind the forming of a low voltage electrical arc?
I am trying to understand the exact process undertaken when forming a low voltage high current electrical arc, such as in a welding scenario.
My understanding at present is that without a high voltage,...
0
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3answers
104 views
Filter passband amplitude ripple and group delay ripple (group delay variation)
Are they completely independent? or does one lead at least partially to the other?
0
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0answers
43 views
Specific Type Of Toggle Switch
I’m needing help finding/naming a specific type of on/off toggle switch, but can’t seem to find it by googling. Basically, I want a toggle switch like in the picture below that I can use to power on ...
1
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4answers
60 views
Posssible Delay for a electric circuit needed
While I know that it is impossible to slow light down I was wanting to delay an electrical response from a diode using either a resistor or a capacitor but I could not remember, which does which. The ...
1
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0answers
40 views
Is there a potential earth leakage or is it something else?
I'm facing an issue in my house since last Christmas. When the lights or appliance with motor in any room are turned off/on the TV would go out and come back on in a short span (as if the power went ...
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0answers
17 views
Tripping threshold question
The tripping threshold is between 0.5 and 0.7 times the rated voltage
I will like to confirm the above statement. If my rated voltage is 215V, assuming we picked 0.5 setting, does this means that the ...
0
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0answers
16 views
Modelling internal fault in a transformer
I am doing an analysis of faults in transformers and i need to model internal faults in a transformer. Please do advise on how to model internal fault in Simulink.
Thanks in advance
1
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1answer
87 views
DALI Lighting (IEC62386-209) and Command-In-Between
Good Afternoon,
I'm having some trouble understanding IEC62386-209 section 12.7.3, which involves sending an "ENABLE DEVICE TYPE 8" command to DALI Control Gear prior to sending an extended (DT8) ...
2
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1answer
198 views
Please help me in identifying surface mount component
So I've accidentally knocked down a computer system used to take kitchen measurements. I've caused a short in the power supply which caused two SMD components to burn in the motherboard. I've ...
0
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1answer
74 views
Can I replace a 32 A switch with a 32 A MCB?
A switch for a water heater in my apartment is broken (image attached).
It is an "Anchor Roma 32 Amp 1-Way Switch with indicator".
Can I replace it with this or this switch?
Would the installation ...
1
vote
1answer
58 views
Floating Nodes Error in Simulation in ORCAD PSPICE
Does anyone have any insight as to what exactly is wrong with my circuit on Orcad/PSPICE?
My name is in the project name so I blurred it out for obvious reasons
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3answers
127 views
Assortment of electrical component for beginner [closed]
As a newbie in electronics when building projects with Arduino, sensors etc. on PCB I often have a problem with electrical components like capacitor, resistor, diodes, switches etc. For different ...
1
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1answer
48 views
Replace everything in the circuit except the 3 A source by its Thevenin equivalent circuit and use the result to find V1
Replace everything in the circuit except the 3 A source by its
Thevenin equivalent circuit and use the result to find V1.
This is my solution but the teacher said it is wrong and i do not know how to ...
0
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2answers
100 views
Male configured 'outlet' [closed]
All I can find is a female configuration like this, but need a male configuration.:
BougeRV 50 Amp RV Power Outlet Box,Enclosed Lockable Weatherproof Outdoor Electrical Nema 14-50R Receptacle,125/250 ...
5
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10answers
1k views
Film/TV question: How to build Foam Cutter from only household items
I'm writing a scene for television and I need to make a foam/rope cutter from household items. I've watched several videos, including this one: https://www.youtube.com/watch?v=cM0lP2WCzY0, and ...
0
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1answer
29 views
What is sample rate of DSO and what if we have a DSO with low value for sample rate?
I bought a USB DSO and its sample rate is only 48MS/Sec. I never had any problems measuring normal signals from a function generator and other circuits. I have seen many DSOs with high sample rate ...
6
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1answer
177 views
Hair dryer fuse too low for spec power?
So I'm tearing down this hair dryer for a school project where I need to make it have variable heat and variable motor speed which can be controlled through an Arduino. I'm currently looking at where ...
0
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0answers
17 views
Noise Temperature to Noise Factor
If I have a noise temperature of (I'm not sure how to do subscripts) Te = T1 + T2/g1 and since Te = (fn-1)To. I believe that fs = f1 + (f2-1)/g1
But I'm not sure what the steps in between these 2 ...
6
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3answers
3k views
Operating principles of a sawtooth wave generator bootstrap circuit
In one of my assignments, I was asked to explain the working principles of the sawtooth wave generator shown below. The input voltage is a spiked waveform obtained from a differentiator circuit.
I ...
0
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0answers
41 views
wiring for my timer switch
I'm trying to wire as per the following wiring diagram.
I completed wiring as below, and timer is switching on, but at the programmed time, light is not switching on, anything wrong with wiring.
See ...
0
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2answers
75 views
5v relay not working from GPIO [duplicate]
I have a 5v relay which is not working on my esp-32 dev board. I understand that there logic levels are different but i checked the seller and they say it works with 3.3 logic level. When powered by ...
4
votes
2answers
158 views
How do you differentiate between rms and peak voltage?
In the circuit above I've been asked to calculate the average power absorbed by the 10 Ω resistor. I managed to calculate a value for \$V_0=40\sqrt2\,\angle{-25}\$.
But I'm not sure if this is peak ...
1
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1answer
60 views
How to effectively avoid current drops while stepping down the voltage?
We are using a PC power supply to power our project, which is a Robotic arm. Since our power supply has a 12V output voltage, can anyone please advise how to step down the voltage (12V) to 6V.
Using ...
0
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4answers
150 views
I'm building an H bridge and I'm stuck at some point
Here's the H bridge I'm building
Vcc = 9v
10 k resistors for the pullup
1k resistor for the transistor
2 PNP BC557
2 NPN BC547
2 push buttons
It should have a DC motor but I'm using LED and a ...
0
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0answers
30 views
i wonder about scott connection's phase shift like a 90 degrees [duplicate]
first of all it is necessary to refer this link.
https://circuitglobe.com/scott-t-transformer-connection.html
In this link u can know scott connection and i wonder about V2t and V2m's phase ...
2
votes
1answer
78 views
i wonder about scott connection [phase shift] [closed]
something like wye-delta and delta-wye connection.
we can originally know wye-delta connection is step-down transformer and second side voltage phase is being to -30 degree. And also delta-wye ...
0
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1answer
62 views
Circuit design when using batteries [duplicate]
I'm new to making any electrical desings that don't have a manual.
I have six 12 V 20 Ah Lead-Acid batteries connected in series.
Can a 12 V 14 Ah or/and a 12 V 6.5 Ah battery(ies) be connected in ...
0
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1answer
249 views
Extension cord to Power strip in old house [closed]
I live in a old house that has very old wiring. We got a small upgrade so we now have grounded outlets. I need to plug in a lot of devices into this outlet such as speakers, monitor and a gaming ...
0
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1answer
307 views
Find the Thevenin's equivalent of a circuit between nodes A and B
My class had come to discuss the Thevenin's theorem and we stumbled upon this particular problem which quite confuses me in a way that what I found is different than what my lecturer taught us. So, ...
0
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2answers
111 views
What's the difference between µF and µFD?
A datasheet is referencing "CAP SMD0603 CERM 1.0UFD 16V 10% X7R ROHS" which is calling for a UFD. But I have a uF cap C1608X7R1C105K080AC which is "CAP CER 1UF 16V X7R 0603". Should that work fine? Is ...
0
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0answers
122 views
How can I use pull up and pull down resistors in an H-bridge?
I have to build an H bridge out of the following components
2 PNP transistors
2 NPN transistors
battery 9V
4 resistors for the transistors
a DC motor
I connected the above equipment but, I also ...
0
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0answers
189 views
Can we use a ground plane and a VCC plane in a 2 Layer PCB?
I am designing a custom PCB of 2 Layer in the eagle CAD with SMD components. It is difficult to route the VCC and the ground for all the planes. I used a ground plane on one side. But for the VCC I ...
0
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1answer
32 views
Solving second order circuits by introducing a new voltage source?
I was looking at some second order questions on the internet and occasionally I see people introducing a second voltage source divided by "s". They also divide the capacitor by "s" and multiply the ...
1
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0answers
200 views
Cable tray width selection as per NEC 392
I would like to ask if anyone know what is the meaning of the letter b used in the formula in the table 392.22 National electrical code 2017 article 392, pic (attached)
1
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2answers
77 views
How does the primary and secondary voltage of a transformer be in the opposite phase in the vector diagram?
simulate this circuit – Schematic created using CircuitLab
According to the polarity marking, the input and the output voltage should be in the same phase. I've included a simulation result ...
0
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2answers
94 views
Circuit using only NAND gates
I am starting to get beyond frustrated with gates and breadboards now in general because of this simple circuit (which is literally experiment #1 in my digital logic class).
Using only NAND gates, ...
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0answers
50 views
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0answers
44 views
Mesh current method problem with voltage controlled current source
I'm signed up recently to this site but i need help for my Fundametal of Electrical Engineering course.I need to find power of the current source. Thank you.
Note: (y is equal to 2)
0
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1answer
42 views
Help identifying electrical components
Sorry if this inquiry is it a little bit basic and boring, but I need some sort of help with this, and I am really not sure where to look online. I need help identifying several different electrical ...
0
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3answers
74 views
Is the iron loss of an iron core transformer twice the mass of the iron core? [closed]
In a mathematical problem related to transformer loss I've found Iron loss = Mass of iron x 2.
If this is true, then how kg is converted into watts.
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3answers
90 views
1
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1answer
115 views
Wide range Ohmic region Mosfet [closed]
I would like to have a N- Channel (Enhancement mode) MOSFET with wide range of Ohmic region for my project. It's like Vgs varies from 1V to 5V (Ohmic region), Vgs threshold should be >5V, Ids ...
1
vote
2answers
46 views
Engine driven EDF
We all know that an electric motor can be reversed to generate electricity. My question is, will it work the same way if I were to do this in an EDF?
The EDF that I’ve been watching, is producing 35 ...
5
votes
3answers
632 views
Hybrid gas electric drone
I have a nitro engine that’s idling at 1600 RPM. As the title says , I also have a BLDC coupled directly to the nitro engine working as a generator. That generator is capable of producing 3.5kW of ...
0
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2answers
49 views
How to determine electrical energy and the convert it to heat?
I've been stuck on a problem for quite some time now. I really cannot get my head around it. It's been a while for me, and I just recently been taking up a class again in electrical
engineering. I've ...
2
votes
4answers
144 views
What happens to a high power inductive motor if you decrease the RPM to half the rated in terms of current, torque and heating?
and what is minimum possible RPM ratio for a high power motor
1
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1answer
35 views
What is all properties of orthogonal axis (dq) axis?
We know about the transformation between abc three phase to dq0 axis which is orthogonal. BUT I am confused about What is the added value and all properties of orthogonality for dq0 axis that help in ...
0
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2answers
481 views
Designing a Moore sequence detector using three always blocks
Trying to implementing a Moore state machine using three always blocks. The Moore state machine has two inputs (ain[1:0]) and one output (yout). The output yout begins as 0 and remains a constant ...
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3answers
56 views
Is it safe and feasible to use a transformer that is not in “good shape”?
First of all, I want to notice that I also posted this same question to the electronics stackexchange site, since I'm not sure if it belongs to here or there.
I want to make my own DIY spot welder, ...
2
votes
1answer
28 views
How to properly calculate current of a variable capacitor?
So the formula i(t)=CdV/dt works for a constant value of a capacitor, but in a variable capacitor, i found the next formula on another site
i(t)=C(t)*dV(t)/dt + V(t)*dC(t)/dt
Is this formula ...
