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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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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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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Can be Coreless Axial Flux Permanent Magnet Machine (AFPMSM) modelled with Laplace equations for its dynamic performance description? [closed]

I just read in books equations of stator voltages in a dq model of this machine and I want to know if there is any literature with equations in time and Laplace transform applied on them. I don't see ...
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32 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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21 views

Simple dependent source circuit analysis [closed]

Help! Don’t know how to do, only know how to calculate the potential difference between the ports.But for Rth, I need to regard the current source as a open circuit, and is there will have a different ...
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3answers
64 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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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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29 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
92 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
83 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
58 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
32 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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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
49 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
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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
52 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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75 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
89 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
47 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
23 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
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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
63 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
47 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
46 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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0answers
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
43 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
42 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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0answers
21 views

Do all thermoelectric generators (TEG) require two distinct metals?

Most thermocouples that I've seen being sold online consist of two separate metal wires connected at junctions. Many smaller thermoelectric generators consist of a combination of iron and copper or ...
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0answers
18 views

IP2, IP4 relationship with P1 dB of an amplifier

It is well known that the difference between IP3 and P1 dB of an amplifier can be derived and results in a theoretical 9.6 dB difference. Can a similar relationship be derived for IP2 and IP4?
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1answer
54 views

Dynamic model of a two-mass electric drive taking into account the Gear Ratio

Two-mass rotational system has the following form and is represented in following structural diagram. where $\tau_e$, $\omega_1$ and $J_m$ - motor torque, angular velocity and moment of inertia $\...
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0answers
39 views

Can a semi-conductor cooler be powerful enough for a room? [duplicate]

I see semiconductors used for small fridges. I cannot find one large enough to cool a room (in place of a conventional Freon based, window air-conditioner). What engineering problems might a up scaled ...
3
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1answer
45 views

Electrostatic grounding of an electrically isolated concrete floor

I have a question regarding a not-so-common construction setup for a house. In this situation, the concrete slab is "floating"/insulated with a rigid insulation underneath. I understand the ...
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0answers
38 views

ArduinoArduino keypad matrix w/ SPDT

I'm trying to create a keypad matrix with an Arduino. I want do a 5x5 grid but I've run into a problem. I'm using standard momentary SPST push buttons and 2 position SPDT toggle switches (On/Off) ...
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1answer
37 views

Electrical Engineering/Telecommunications/Power Amplifiers VSWR and harmonics

How does VSWR at a power amplifier output affect the level of harmonics? and is there any textbook or paper which addresses this issue?
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2answers
50 views

Demodulation of AM signals in radio broadcast systems

I have a question regarding the demodulation of AM signals in radio systems (like car radio). I know that in order to send the audio signal from the broadcasting station to users we need first to AM ...
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0answers
33 views

Jacobians and Manipulator Dynamics

This is a Stanford Manipulator I started off working on it by initially setting up the DH table Transformation Matrix and then Homogeneous Transformation Matrix I started finding the linear and ...
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1answer
51 views

What does "rigid steel" mean in electrical construction plans and specs

Reference to rigid steel is made in specs with reference to metal conduit. A commenter wanted to add 316 stainless steel as the material but this verbiage with regards to "rigid steel" still ...
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0answers
21 views

What are the IEC IP standards/code for electric vehicles?

What an end consumer should know about the level of IP protection provided for a vehicle against hazards which include but not limited to environmental factors, thermal runaway in batteries, etc.
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1answer
84 views

How do I configure my arduino to use the 628512LP-70 as an external RAM?

I am aware this could cause some serious lag issues. However, I only intend to use that RAM to fill the display buffer for the LCD (240 * 320 pixels). I can't store all of this data in my Arduino's ...
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1answer
64 views

What type of electrical machine component for counting time?

I am looking for the proper piece of hardware to do what I'm looking for on my current prototype machine build. I want a timer to begin counting upwards in seconds when a switch is activated, and ...
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0answers
32 views

Device to measure 3-phase electrical power consumption

For a three phase air-conditioner, what is the easiest way to measure the power consumption? Is there any off-the-shelf device that can get the job done and output the measurements through RS485 (...
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0answers
74 views

Cost effective electronic packaging solution

What would be a cost effective environmentally friendly material to package a simple electronic circuit? The electronic circuit consist of active and passive devices. These electronic circuit also ...
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2answers
73 views

How to drive variable power (up to 1500w) to a grill heating element [closed]

I have a heating element like the following: which is rated to 1500W. I need to be able to drive up to 1500W of power to it, but potentially less. I will be plugging it into a 120V wall outlet. I am ...

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