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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16 views

Controlling Motor Rotation

This is my first question / post here. I have just begun researching motors and how they work, as they are necessary for a personal project. I want to know how to control a motor so that it only ...
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159 views

What is the reason behind the alternating polarities in an electromagnetic rail brake utilizing eddy currents?

The design of electromagnetic track brakes has alternating polarities in order to increase the effectiveness of the braking force. What is the fundamental reasoning behind this increased effectiveness ...
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Voltage drop on amplifier signal after LED switches on

Circuit above shows my design for amplifying PIR sensor signal, which I then feed to Arduino and based off this signal I switch a LED on. Both, the LED and PIR sensor, are on the same voltage rail (9V)...
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AVR ATMEGA328 LIS3DH I2C

Attempting to use I2C to read byte from LIS3DH. I'm doing the what seems to be the correct steps and all I get back is the last address I wrote into TWDR register. I check the status register after ...
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1answer
46 views

How to Supply two different DC voltages using High Current

I'm trying to function a 12V stepper motor(>2.5A) and five 6V servos(>3A). Are there any reliable circuits that can output both these voltages and a high output current since there will be some ...
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1answer
49 views

How do mobile phones produce signals?

Normally it would require alternating currents to product electromagnetic waves. Yet as mobile phone is powered by batteries which only produces direct current, what type of mechanism/structure allows ...
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1answer
63 views

Battery size and maximal power output [closed]

Generally how does the size of the battery affect its maximal power output(together with other factors like materials, for instance)? Under the current engineering technology and with any possible ...
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1answer
69 views

What is the maximum distance for eavesdropping? [closed]

There is a closed question https://physics.stackexchange.com/questions/276667/what-is-the-maximum-distance-for-eavesdropping-sound-waves on Physics Stack Exchange and I thought this might fit better ...
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84 views

Devices powered and charged via electricity generated by human body

I came across articles like: https://www.sciencedaily.com/releases/2021/02/210210142049.htm https://pubmed.ncbi.nlm.nih.gov/27836601 and https://www.dailymail.co.uk/sciencetech/article-2004801/Weve-...
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Is fiber to computer(without the use of LAN cables in between) possible?? Are any further developments getting carried out towards this goal?

All of us know well that the fiber to home(FTTH) connections are a trend nowadays. Every nation is planning to replace the existing metal wires with optical fiber cables. But we also see that the ...
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1answer
46 views

Drawing nyquist diagram by hand for a system with time delay

how can I draw the Nyquist diagram of Kexp(-Ts)/(s*(s^2+s+a) by hand for different a and K values and examine the stability of the system depending on T value? I drew for the case with no time delay ...
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1answer
58 views

Type of Engineer [closed]

I am a mechanical engineer by education (master's degree). I have been working for 6 years in industry. However, I am beginning to search for a new job. I work at NASA as an instrumentation engineer. ...
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3answers
71 views

Is electric motor torque determined by Kv or by power (watts)

I'm trying to size a motor for an e-bike, but I'm confused as to what motor parameters determine the maximum torque that it can output (Kv or power in watts); I've found the following formulas: Power (...
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2answers
38 views

how does the rotary motion in a turbine convert into electric energy?

from what I understand ( please correct me if I'm wrong) the turbine is connected to a magnetic thats being surrounded by copper wire and when the tge wire go from being affected by the magnet to ...
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How much electricity does it take to polarize specific types of insulators?

as I hope you know, electric polarization is when you put an insulator in an electric field, and the nucleus and electron cloud go in an opposite direction. https://www.priyamstudycentre.com/2020/02/...
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2answers
409 views

Amp-Hours vs Volts in electric chainsaw specifications

Can someone please explain what I am losing/gaining in the trade-off between Volts and Amp-Hours when buying a piece of equipment such as a chainsaw. I'm currently comparing two items. I'm making this ...
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5answers
72 views

How can I add the torque of multiple gears?

If I have 3 gears meshed with a gear in the center of the 3 gears as shown in the picture. all of those 3 gears are connected to different power sources. They are free to rotate in the same direction ...
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1answer
53 views

Problem with railway crossing, need help! [closed]

I am looking for a solution to my real-life problem that not only affects me but also many other people. I am simplifying the problem to make it easier to understand. My daily commute to work includes ...
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3answers
37 views

AC/DC Laptop adapter power losses

I have a laptop power adapter shown in the picture below. It is written there 170Watt INPUT: 100-240V ~ 2.5A OUTPUT: 20V 8.5A I believe for AC Input they mean Root mean square voltage/current. for ...
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0answers
27 views

Valve solution for mixing external air into a closed loop climate controlled air circulation system

I'm looking for an electronically controlled air valve solution which would provide a way to mix external air into a closed loop air circulation system used for climate control in an enclosure. The ...
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33 views

Circuit analysis

enter image description here I don’t understand what is the Use of ‘Vin’ as its anode connects to the open circuit.So I can’t even solve QA
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3answers
92 views

If a control system is unstable does it mean it will oscillate?

When a plant is known to be unstable, does it mean it will have an oscillation response?
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0answers
30 views

Clarification on number of poles(magnetic) and induced/output voltage

I get that turning a loop of wire across a pair of magnetic poles induces a magnetic field. But I don't really understand how frequency plays a role in this. I've read a bit and saw that frequency is ...
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30 views

Insulated Wire - Radio Signal

I am looking for a relativity inexpensive wire for consumers whose insulating jacket will prevent radio signals from leaking. We are installing a pet radio fence at home. If you are unfamiliar with ...
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0answers
36 views

Help on IR Proximity Sensor Inaccuracy

I want to measure the depth of a burning soil using IR proximity sensor. The sensor will be placed 20cm above the surface of the soil and measures it perpendicularly. Problem #1: I'm quite concerned ...
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2answers
52 views

Hardware device to evaluate several sensors

Two tanks with three continuos, redundant level sensors each need to be supervised so that when a certain total volume is reached, a specific actor is triggered. This could be done via the installed ...
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3answers
99 views

Why not bury electrical cables when laying road?

In light of the recent (Sept. 2021) power outages relating to storms and flooding, I've been thinking about a new version of a question that's been asked many times before: why not bury electrical ...
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2answers
86 views

Circuit with Contradiction

What would happen in real life if you made a paradoxical circuit (a circuit whose output is on iff its output is off). Something like this: Would the discrete model break down and the output end up ...
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1answer
77 views

DC motor as generator - some questions

I have been doing some experiments using a small brushed permanent magnet DC motor as a generator. I have it coupled to a similar (as in, exactly the same) motor which is powered by a PSU. thus ...
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1answer
33 views

Full state feedback of a closed loop system

Does Full state feedback gains affect the dynamic or steady state gain of a closed loop system?
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0answers
51 views

How to lock a door using a battery-powered lock, without an outside handle?

Scenario: Door has a flush outside, without any knobs or handles. The door is opened by pushing it. When the door is left un-pushed, the door closes itself as there is a door-closer arm attached to ...
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0answers
50 views

How are NASA's mars rovers able to operate with such little energy?

The latest Mars rover being, NASA's Perseverance, uses the Multi-mission radioisotope thermoelectric generator, which has a maximum power output at the beginning of it's operational life of 125 watts, ...
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1answer
58 views

Do they sell some sort of non-"consumery" GPS trackers?

I have seen these expensive things that you can put in a moving box while moving, to keep track of your stuff in case the moving people drive away with their truck and steal it. I also see expensive ...
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4answers
84 views

How can I map a global spherical position of a central normal vector to the rotation of 2 perpendicular motors?

I have a machine that rotates two concentric frames. The outer frame has a motor that rotates it relative to the global y-axis, and the inner frame has a motor that rotates it about the outer frame's ...
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2answers
55 views

Combining torque of IC engine and electric motor

I currently have a 6hp IC engine which I plan on using to drive the rear axle of a go-kart. I want to increase the torque delivered to the shaft by adding an electric motor in a sort of parallel ...
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1answer
45 views

How this synchronous motor works and how to modify them?

I have the following synchronous motor ripped out from an old range hood in my kitchen. I used new electrician tape to cover up the coils that should form the electromagnet--the old cover is too oily....
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1answer
48 views

Can internal heat reduce significantly a laptop's lifespan?

Some days ago I had an heated debate (pun not intended) with a friend regarding the use of my laptops. Basically he says which I'm slowly killing them by using them for computing intensive tasks which ...
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1answer
35 views

Reading odd dimensions

I am reading a paper and the dimensions for some electrodes are given, but I was wondering if I was reading it properly: 30 × 15 mm2, is this the same as: (30 × 15)mm2 ? To track the published paper I ...
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95 views

Charging a 2020 M1 Macbook Pro from a low-voltage solar array

I'm working on a small project to mount solar panels to a Macbook case which would allow it to charge/offset battery consumption. I noticed that I was able to power the Macbook on public transport ...
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2answers
90 views

Effectiveness of LiDAR in manhole structures?

I'm an intern at an electrical utility and I've been tasked with doing a proposal/cost analysis to evaluate whether or not starting a pilot with a company specializing in robotic inspections is worth ...
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1answer
48 views

Modeling a simple capacitor

Hey guys I am trying to model the performance of a hypothetical capacitor. Capacitance depends on its geometry, but the charging and discharging of the capacitor depend on a resistive load within the ...
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2answers
24 views

Tolerance resistors in CSR

CSR - Carbon composition resistors. P1 :About tolerance resistors , what I have understood is that if a 220 Ω resistor has a color band of silver. Then , it’s tolerance = ± 22%. So , resistance of ...
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4answers
4k views

Extending USB cable makes it not work

I have a camera that uses a USB cable to connect to my computer. I want to extend the cable from 3ft to about 6ft. Originally I just created my own cable, soldering 4 26AWG wires to a blank USB ...
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1answer
64 views

Where to acquire / create LED optics

I'm working on a few projects that require lenses to focus LED light flashes, similar to those lenses used by police lights (TIR lens) and other strobe traffic lighting utilizing Fresnel lenses. I've ...
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1answer
52 views

Equivalent Resistance Between Two Points in a Wye Network

I am interested in learning how to calculate the equivalent resistance between two points in a wye circuit for application to thermal networks (i.e. I'd like to calculate the equivalent thermal ...
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1answer
44 views

How can I integrate a system to track a tractor's movements in a field using GPS? [closed]

I work in agriculture and I'd like to track my tractors "trips". What I'm looking for is a device that will record this data using GPS, and send it to a database to later process it. I ...
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1answer
47 views

Can peltier modules be more efficiant with a medium other than air?

Peltier modules are said to be less efficient than conventional air conditioners. Can a medium like moving cold water over the heat sink increase the efficiency of a peltier module? By how much? ...
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29 views

What is the most efficient way to convert shaking/vibration to electrivity?

What is the most efficient way to get electricity from shaking? I am thinking about something like shown in the picture below (the magnet is going inside the coil), but maybe there is a better design ...
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1answer
49 views

How to calculate power line loss with ohm's law and power equation?

Hello I have a question about electricity. I know that transmitting power over long distance is better in AC. I also heard that the voltage needs to be high to reduce losses. I wanted to calculate ...
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1answer
43 views

In your expercience as an engineering manager, how do you do your strategic planning? [closed]

I am an electronics engineering student and taking up a course on engineering management. One of the activities I have to do is ask engineering managers or general managers of engineering firms about &...

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