Questions tagged [electrical-engineering]

Study and applications of electricity, electronics, and electromagnetism. Use this tag when someone who has trained as an electrical engineer is likely to be able to answer your question.

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How do I select equipment for a load management system of EV chargers?

In a student project, I need to design a EV-charging system for a domestic high-storey building. As there is not enough loading(the charging stations are connected to tenant supply of multiple floors),...
Esther Liu's user avatar
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40A mcb. 40A per pole or 40A altogether?

If I have a 40A 3 pole Miniature Circuit Breaker ("mcb"), does this mean 40a per pole or 40A altogether? The quality standards made me write some more so I do it.
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How do I calculate the thrust output of a high bypass turbofan engine? (7th grade)

I am trying to create a small version of a high bypass turbofan engine but I can't seem to find any materials that show how to calculate thrust but on a 7th grade level. If anyone here can help me I ...
random dude tryna learn stuff's user avatar
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Connecting logic gates with transistors

I've been trying to create different parts of a basic 4 bit computer with transistors like a 4 bit adder, 16 bytes of memory, and registers but when I tried to make a 4 bit counter I failed to find a ...
reidisabot's user avatar
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Three-way energy harnessing device engineering

I have a question regarding a certain engineering of a such device capable of harnessing energy in such three way. So, what I want to happen is to implement a solar and motion energy harnessing. The ...
William John Otsuro's user avatar
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Total electrical resistance of a material across different cross sectional area and temperature

It is given that the electrical resistance of a material is: $R = \frac{\rho l}{A}$ Where $\rho$ is the electrical resistivity of the material, $l$ is the length of the traversing current through the ...
lems's user avatar
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Seeking Manufacturing Advice: Low-Dose Powder Dosing Device

Hi everyone, I'm working on a project that requires a device to dispense a very small amount of powder (around 1 gram per second) in short bursts. Ideally, the device would "sneeze" the ...
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Seeking Assistance with Solid State Relay and Arduino Nano Power Failure Solution

This is my first time, and I'm looking for guidance on my approach to a particular problem: ensuring that a Solid State Relay (SSR) closes whenever my Arduino Nano loses power. The SSR, powered by the ...
Prabhas Kumar's user avatar
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Error code in the automatic door system

The automatic door lock system malfunctioned due to an electrical surge. Currently, the door is closed but the screen shows the door open. We opened the door by pulling the motor handle and putting ...
Büşra Fatma SUSUZ's user avatar
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Why isn't my valve controller not providing sufficient amount of voltage to my fan?

We're using the valve controller below to control the speed of a (generic) fan: https://products.axiomatic.com/viewitems/valve-controls/can-to-4-outputs-valve-controller Problem: We're supplying the ...
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How to measure the rotation direction and speed of a ring on a finger?

I am trying to create a device that can measure the rotation of a ring on a finger. Basically there's going to be two rings on the finger, one that rotates and one that is stationary. The idea is that ...
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How to calculate the distance between cable supports, considering the weight and other factors?

I am designing a cable infrastructure and have come across the question of calculating the optimal distance between supports for cables. What formula can be used to determine this distance, taking ...
Nineor's user avatar
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Mesh Size and Thickness for Faraday Cage?

I've been considering a double faraday cage of 1/4in 23-gauge wire and 1/8in 27-gauge wire. With this setup would the 1/4in on the outer shell and 1/8in on the inner or the 1/8in on the outer shell ...
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Strange inverter PWM output signal at startup

I’m monitoring the output of a 3-phase inverter with an oscilloscope, the inverter is a Siemens Sinamics V20. I see that when I enable the power output of the inverter, I have a strange sequence ...
NBmaurix's user avatar
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How to calculate the RPM required from a DC motor in order to pull an object that is attached to wheels

I am attempting to make my first project idea of using a DC motor as a winch motor in order to pull an object, I am using string as the rope to pull object I am attempting to "winch" (air ...
 Aidan Docherty's user avatar
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Is it possible to build a radar that is shielded behind one meter of ceramic material and still detect people 500 meters away?

I saw that there are radars which can detect people behind walls, so I wonder what the limitations of radars are when it comes to detecting people while being protected behind thick ceramic shield.
eleanor's user avatar
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What substances have the lowest dielectric strength (volts/meter)?

All the tables of dielectric strength I can find are lists of materials that engineers use as practical insulators, and air is usually the least insulating thing on the list. Where can I find a more ...
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What will happen if you attach the negative pole of welder to the rotor of the motor or the body , will that cause problem?

I have built a machine that rotates a cylinder to weld it, I have to attache a negative pole to the cylinder which is connected directly to the rotor of motor, the motor is controled by an Abb vfd ...
Alyamin Smail's user avatar
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Truncation operator

I'm currently working on this question, and I'm unsure how to determine if it is time-invariant or not. When I perform y(t-t0), does it shift even the time at which the step is defined? Furthermore, ...
philip ribeiro costa's user avatar
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69kV insulator identification

Rather Specific question, is there a way or could anyone figure out what this clamp-top 69kV multipart insulator came from like who makes it or the technical name etc these are transmission lines in ...
JJMclean's user avatar
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Using Relay and contactless water level sensor to switch on or off motor pump

I have no prior experience related to electrical projects and I am having confusion about which type of relay and how to connect relay, contactless water level sensor and motor pump. So basically I ...
Basmati_Reis's user avatar
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Principle of RF MEMS switches

I am studying mechanical engineering at university and am trying to design an RF MEMS switch. In "RF MEMS Switch Li-Feng Wang, Qing-An Huang, and Lei Han" says "When an adequate voltage ...
Yuu's user avatar
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Electrical Charges

I have been doing some research on different textile materials and electrical charges. If I wanted to change a negatively charged material to a positive one, would that be possible? Thinking I could ...
HDrum's user avatar
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Why aren't Dielectric Elastomer artificial muscle actuated robots more common?

Well, while searching for dielectric elastomer actuators I can find that they normally have efficiencies around 80% or more (source page 38), they are cheap and easy to build. But the more I search ...
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Electromechanical connection for lamp

I need help with a project and would appreciate any advice or recommendations you can provide. I'll do my best to explain my concept and the issue I'm facing. Concept: I have a pad with a heavy ...
WAus's user avatar
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Machine with Multiple Motors and Fusing?

We have some old machines that I'd like to overhaul the electrical on. They are wired like in the schematic I provided. L1, L2, L3 come from a fused disconnect on the machine with a set of 30A fuses. ...
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PV solar panel is producing more than is possible according to its datasheet?

I have a client in Belgium that has 16 DM400-M10-54HBB on his roof. On Saturday the 2nd of December 2023, the PV output was 3.95 kW, according to the log of the Huawei SUN2000 4.6KTL-L1 5 kVA inverter....
fromwastetowind's user avatar
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1 answer
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How do I electrically charge a sheet of plastic strongly enough that it firmly sticks to the wall?

electrostatic whiteboards I have a bunch of these special dry erase sheets. Someone gave them to me as a gift about a year ago; I see they are still available for purchase on the Internet — you can ...
Ignat Insarov's user avatar
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1 answer
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Light Switch Problem

I have a problem that I believe there is a solution to but I'm lacking in the knowledge on how to do so. There two switches in a building. Both are single pole single throw switches and cannot be ...
denismoc's user avatar
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High voltage wires

We have bought a house near high tension wires (at a distance of around 20m). Will it be noisy during the rains, and more importantly will the ionization increase the risk of cancer?
Shrey Iyer's user avatar
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Modern consumer unit, old wiring. What's left that could go wrong?

An elderly relative of mine had her fuse box professionally replaced with a new consumer unit that conforms to the 18th addition IET wiring regs. This work was done about 2-3 years ago. Nothing ...
ConanTheGerbil's user avatar
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1 answer
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Homopolar motors - a curious realisation

So I've been chasing down devices with unique operational characteristics looking for potential in energy generation and I ran into these things: homopolar motors. About 9/10 of these things are a ...
Instrumentation-Tech's user avatar
2 votes
0 answers
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Are two solars panels more efficient than only one of twice the power output?

Is there any advantage to use two 50 W solar panels in parallels instead of one 100 W panel? As we know, the effect of partial shadow on a solar panel can make the whole panel ineffective. We want to ...
Charles's user avatar
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1 answer
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Controls architecture for stepper drivers

I am working on a project which deals with a large number of stepper motors and other devices. A key feature I want to achieve is create a modular/ expandable system, so that new devices can be easily ...
rob's user avatar
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Inductor calculations helper script and motor idea

I have an idea for a motor involving the use of a flyback transformer to recycle EMF in a custom designed pole-to-pole repulsion-attraction DC motor. I wrote a script to help with setting design ...
Instrumentation-Tech's user avatar
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2 answers
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So even though the raw materials of semiconductors are cheap why is their cost so high and why don't we use conductor for the same job?

The materials used in making semiconductor are cheap and readily available then does the cost of processors so high can't we use metals like copper and iron which very good conductor for manufacturing ...
Sidheswara Sahoo's user avatar
1 vote
3 answers
76 views

Is there a reason many EEE undergrad programms have a Complex Analysis Course?

I know the very broad applications of complex numbers in engineering, although I don't understand the applications of complex functions of complex variables. Things such as the Residues, Cauchy ...
grad8766's user avatar
1 vote
0 answers
16 views

Failed in upload firmware to esp32

I'm having an issue when uploading code to my ESP32. Previously, I had configured the partition scheme to 'minimal,' and I was able to upload code without any problems. However, after I fixed my ...
Tân Nguyễn Minh's user avatar
-1 votes
2 answers
72 views

Electricity generation from sand particles in airstream hitting surface [closed]

I read an experiment which demonstrated that metal filings fired at a surface using air blasts charges the particles, surface and airstream. I understand this is triboelectricity, resulting from ...
El Flea's user avatar
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How could we aproach development of touchscreen with morphing surface or morphing keyboard?

There is this technology of braille e-readers. It is relatively simple and reliable but it never had much commercial success probably because small customer base. In past a company called Tactus tried ...
Martin Pavlíček's user avatar
1 vote
1 answer
57 views

What are the issues with using a general purpose motor on a variable frequency drive?

What happens in this scenario - a modern electrical motor, three phase, squirrel cage, that is not specifically designed for operation via frequency inverter, is in fact operated on an FI? How long ...
mart's user avatar
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RPI Pico GPIO output not producing square wave

I have an RPI Pico that is configured to pulse GPIO 5 every 1000 microseconds to control a stepper driver. For some reason, this pins output does not produce a square wave, instead I am seeing a ...
Jack Campbell's user avatar
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14 views

Pressure Boosting Pump Running Overcurrent

I'm working on an industrial water re-circulating system that is having an overcurrent issue that is baffling everyone involved (design engineer/plumber/electrician/pump and motor Mfg). The system ...
user2059972's user avatar
1 vote
1 answer
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Confusion regarding SI units of K (stiffnes)

I know that stiffness, K is equal to product of moment of inertia and square of natural frequency K = Jωn2 Where K = stifness, J = moment of inertia and ωn = natural frequency SI unit of J is kg m2, ...
DSP_CS's user avatar
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3 answers
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What does 12CC refer to when talking about voltage?

Is it 12V with a connector? For example in the data sheet here: https://www.hydraulicmegastore.com/product/vcf12nc12cc/ Is this related in any way? (A DMP-12CC connector cable) https://www.monacor.com/...
cookingoil2000's user avatar
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Would a conical-shaped solenoid be propelled by its interaction with the Earth's magnetic field?

I am wondering if the interaction between the magnetic field created by a conical-shaped solenoid and the Earth's magnetic field will result in this conical-shaped solenoid being propelled through the ...
user57467's user avatar
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1 vote
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Calculating runtime of battery

I'm a CS guy so I am pretty clueless when it comes to electrical engineering, so maybe you people can help me with this one. I have a Battery with 550 mAh capacity. I also have a small e-paper display ...
Laurids's user avatar
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2 answers
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Using the electrolysis of water to cool a room

Browsing the internet yesterday I came across this very esoteric paper which purports to describe the construction of a device which uses the electrolysis of water into hydrogen and oxygen (a highly ...
Hadi Khan's user avatar
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2 answers
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Methods for precission control of a freezer cooling output

I am doing some experiments in fractional freezing with a modified residential deep freezer. I have programmed my own PID controller on an Arduino setup such that it will not cycle the refrigeration ...
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Tunable phase delay for RF modulation

I've been trying to understand if there's a way to create two RF signals at the same frequency with a fixed, tunable phase delay. The goal is for one to trigger an RF-modulated laser and the other an ...
magnetochiral's user avatar

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