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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Resources to learn Digital Design Fundamentals EEE120
I'm looking for some recommendations on the best resources to help me to learn EEE 120 - Digital Design Fundamentals course material?
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Can my charger handle this?
I am trying to put 230 V dc on the ISDT 608dp charger for my FPV drone batteries (I don't know if this is the right form). This is the link: ISDT 608DP. Can my charger handle this? AI says it can but ...
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Which language is used to program a PLC?
I want to learn the PLC and its programming, please let me know which language should be used?
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How to find the charge gradient of a polarized wire?
How would I find the charge gradient or total charge on either side of the wire, given the application of an electrical field parallel to that wire, provided by, say, a negatively charge plate.
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What are the fundamental limits on the accuracy of a railgun in space?
I can't find anything on the fundamental accuracy limits of the system. I want to know how precisely the projectile coming off the rails can be aimed, probably using a plasma contact armature (because ...
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is it possible to negatively charge a wire?
Lets say I charge a parallel plate capacitor.
I then remove that capacitor from the circuit, and then separate the plates, and connect a wire to the negative plate. Will this lead to an influx of ...
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Electric capacitance of a single block
How would I find the capacitance of a single block of copper?
The dimension of this block is 1 x 1 x 1?
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So I am building this mechanism and I need to bring the rotation down without changing speed or direction
Just like the Title said I need to move rotation down without changing speed or direction. I can’t use belts because since I will be using a motor, when it stops the belts won’t.
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Good, reliable, low-resistance electrical connections to an aluminum vacuum chamber
Vacuum chambers for physics experiments and scientific equipment are sometimes made of aluminum, though stainless steel and mu-metal chambers are used as well.
Aluminum forms a thin native oxide layer ...
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Power station design
I have often read that nuclear power stations (or any big fossil fuel station for that matter) are only suitable for base load power generation as they cannot easily be ramped up and down to match ...
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Shell Eco Marathon Hydrogen Prototype Class
I am a part of a team developing propulsion system for the shell Eco Marathon Hydrogen Prototype class. I wat to size the PEM fuel cell correctly. Can anyone provide some resources or detailed ...
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Difference between polarization angle and poling angle in piezoelectric material
I was reading the research article: Demonstration of optimizing piezoelectric polarization in the design of a flextensional actuator, where I had confusion differentiating between poling angle, which ...
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Making Silicone Rubber Surface Conductive
Hey Engineering Community, a physicist this side.
I am tinkering on a project where I need a local deformation of the thin sheet(0.2mm thickness, 25cm*20cm dimension); pressing on the surface from one ...
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Why are there no UPS power supplies that use an external Automotive battery for storage?
What I've learned:
A: UPSs generally use sealed lead acid batteries, which use a slightly higher voltage to charge. Using an auto battery will result in the battery being in a slight state of ...
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How is the city power grid routed and connected to individual locations such as houses?
I'm an electrical engineer but I don't know enough about the power distribution grid or civil. I'm no electrician either.
My initial question is how does a new construction, like a home, get safely ...
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How to check if a USB conector is broken
Suppose we want to check that usb port is working. we can do the continuity test with a multimiter.We connect the positive part of the multimiter to positive part of the connector and we do the same ...
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Fixture to hold and deliver current to crystal cathode in vacuum chamber
At my internship, I have a small crystal (about 5-8mm long by 2-5mm thick) that needs to be mounted in a vacuum chamber (which is 35mm on the inner diameter) to serve as a cathode with 1.0 to 1.5A of ...
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Find the equivalent resistance between the points $A$ and $B$
In the figure shown below, find the equivalent resistance.
I know I should add my attempt but I don't know how to approach these type of problems. This isn't the standard series-parallel combination ...
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Battery thermal loss
A copper bus bar is subject to a short circuit current of 500 A for 10 s. The section of the bus bar, through which the current flows, has a length L = 50 mm and a cross section of A = 20 mm^2. ...
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Will a bare wire encircling a tent and connected to a tall metal rod help to protect the tent from a direct lightning strike?
I am planning to go camping later this month and I am concerned about lightning since the campsite I will be staying at is located on flat terrain in a rural area in Illinois. This campsite is located ...
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What are the criteria for selecting CTs in a power system?
In powersystems how can we select CT's whith dinite sepecifications?
for Metering and protection systems
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RF MEMS (Radio Frequency Micro-Electro-Mechanical Systems) Switches
RF Reflection Damage. What would the artifacts at the contact beam areas looks like under a SEM examine? More like arc damage or diffused or have a burned thermal damage appearance? Thanks Charles ...
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Closed loop motor speed algorithms
TLDR; looking for algorithms to control a motor. I have a near-random torque, a battery current that can destroy my motor driver, and I aim for a stable output speed regardless of torque. My inputs ...
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Can i use a metal gear servo motor to lift a 4kg load and then attach it to an actuator?
I am doing a project if which i am trying to resemble some muscle movements of an arm and i want to attach an actuator to a motor. But i don't know if a metal gear servo motor can lift that much load. ...
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Using a multimeter in the Wheatstone circuit
If I make a Wheatstone circuit and connect it to my multimeter, power supply and strain gauge; I would need to read off the voltage output and then calculate the strain resistance according the ...
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Curious about the math portion of subjects
I am a long time civil engineer. But I am interested in learning electrical electronics engineering and lately have been teaching myself about analog electronics, signals, digital electronics... One ...
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Unable to calculate Thevenin resistance
I have to solve for the Thevenin Resistance for the following question and I am unable to do so. Any help is much appreciated.
When calculating the Thevenin resistance, I shorted the voltage source. ...
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Resistance of a pressure sensor from Wheatstone bridge
How do you get the resistance value from a calibrated Wheatstone bridge circuit?
I want to build a Wheatstone bridge to get the resistance of a pressure sensor. The unknown resistance in the ...
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Converting string vibration to electricity
Is there a device that can use the energy from a vibrating string (i.e. guitar string, etc.) to produce enough electricity to power a small LED?
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Can I perform a hard reset of a USB flash drive?
I don't typically post to engineering but I need help with a USB drive. First off, I have a USB, a Sahara 128mb, that once became unusable on windows machines, and I thought it was dead. Yet I kept it ...
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Double Junction MS Contact
How can I deal with a double MS Junction?
the problem is there are thin Si sample with two metallic contacts on side. and the N type doping at Si is ND=1015cm-3 everywhere. Schottky barrier height of ...
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Relationship between parameters in MOSFET in CS configuration, voltage divider biased
I have this question.
I have calculated ID, since power budget is given, ID is a simple P/VDD.
Using the ID, RS can also be calculated since it's given that there is a voltage drop of 400mV across RS.
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IEEE1451.4 Standard, ConRes + ConRelRes Datatypes
I was wondering if someone could shed some light on the ConRes and ConRelRes data types that are listed in the IEEE1451.4. I am interested in writing a table for a bridge sensor (template 33). So for ...
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Can this new AC motor/generator design work?
I'm currently in the works of developing a vertically suspended flywheel, and I'm trying to figure out the best method to convert rotational energy to electrical energy and vice versa. I don't want to ...
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Is the electrical grid a centralized, decentralized, or distributed network? Which type is most efficient?
Is the electrical grid a centralized, decentralized, or distributed network?
Each dot represents a generating station, consumer, or relay of electricity:
Which type is the most efficient (has the ...
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How to calculate the torque disturbance of an unbalanced flywheel?
I would like to understand how an unbalance of a flywheel affects the dynamics of a simplified mechanical model.
Assuming that the mechaincal dynamics can be modeled as (neclecting inertia of the ...
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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),...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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