Read about electrical engineering | 189 Discussions | Page 6

  1. Alex Mercer

    Correct electric charge/current flow & left/right hand rule?

    Hello there, people! I am quite new here; in fact, this is my first post. I am quite strange to this place. Feeling kinda welcome, though. Okay, so short to the point. I am an 8th grader, and my school just started teaching us about electricity. Well, the basics. I knew much about it, much...
  2. P

    Tap Changing (ULTC) Transformers and Reactive Power Control

    So I am trying to understand how a ULTC operates in the Reactive Power Control mode (it adjusts taps to control the reactive power in a line). What equation is governing it's operation, and what variables does it adjust in order to increase/decrease reactive flow? Is it just the simple reactive...
  3. Domenico94

    Diode exercises

    HI everyone. I'm an engineering strudent, looking for online material with exercises on diodes...anyone can send me a link here with explanations of the various exercises? Thank you very much :)
  4. MagnetDude

    Engineering I want to do nuclear, electrical, and mechanical engineering

    Because there are only so many characters I can put in the title I will future explain down here. I want to do design/work on many things... I don't know how likely it is for me to do these things, but I want to work on electric motors, generators, nuclear reactors, Combustion engines, steam...
  5. A

    Fermi energy in metals approximately doubling

    Between Cs and Na, the fermi energy in metal approximately doubles. why doesn't the carrier concentration also double?
  6. A

    Heat simulation in electrical/mechanical engineering

    Hi all, I was wondering if anyone uses simulation software's to tackle the heat related issues in electrical/mechanical engineering? Regards
  7. L

    Electrical Engineering, Computer Science or Economics

    Dear PhysicsForums members, being currently in my final year of Austrian high school I have to decide what to pursue my Bachelors degree in. (Un)fortunately I have three huge interests. Those are Economics, Computer Science and Electrical Engineering. All of which are highly fascinating and I...
  8. C

    Schools Electrical engineering undergrad to physics grad school?

    I am an electrical engineering undergrad student just finishing my first year. I have a love of physics and I was starting to wonder if it would be possible for me to stay in EE undergrad but change to physics for grad school. Is there enough physics in EE that I could make the switch?
  9. G

    Linking Fourier Transform, Vectors and Complex Numbers

    Homework Statement Homework Equations The Attempt at a Solution I tried to attempt the question but I am not sure how to start it, at least for part (i). My biggest question, I think, is how does the multiplication of a random complex number to a Fourier-Transformed signal (V(f)) have...
  10. M

    Importance of QM to EE and CE

    Hello, I recently read that MIT redesigned its EECS program. It redesigned it about 30 years ago to include more mathematics and solid-state physics but this time they are adding more QM. At my university, we study basic QM in freshman year physics and then again in third year in an EE subject...
  11. G

    Fundamental frequencies of square wave and sine wave

    Homework Statement What are the fundamental frequencies for a 50 kHz square waveform of 50% duty cycle and a 25 kHz sinusoidal waveform, respectively? (The duty cycle of a square waveform is the ratio between the pulse duration and the pulse period.) Homework Equations My teacher then gave...
  12. mostwantedmani

    Increase the frequency of AC current

    How to increase or decrease the frequency of AC current linearly? Suggest me some ideas
  13. N

    Home Electrical Service Line

    Pardon me if I stated the title incorrectly/ informally. I just want to say about the title is about the 220 V, 60 Hz source (present in our outlets also) in our house by which comes from nearby electrical post. I have four questions in this post/thread so kindly tell me if I need to edit this...
  14. R

    Ultrasound NDT (non-destructive testing)

    Hi all, I've a question and I hope that I can get some answers here. As what my project has tasked, and what my lecturer had said. He needs me to build a device for NDT Testing. Currently the set up is that I would source for a transducer via olympus coupled with a USB oscilloscope capable...
  15. L

    Cenco Electrical Device Found help needed identifying

    Reader, Forgive me if I break any of forum rules, as I am a newbie posting here. Today, last minute Christmas with my beloved other, I found some sort of vintage electrical device. I understand the basic principles behind what would be happening on the stand with electricity. However I am...
  16. Aamna

    Engineering Mechanical Engineeringmajor with math minor?

    Hello everyone! So, I am a mechanical engineering student but I've recently discovered my passion for electronics and computer science. I would eventually like to pursue a graduate degree in either or both (if that's possible) of these fields. I am thinking to get a mathematics minor to help me...
  17. L

    How do I get a career in Space Technology?

    I am an undergraduate Physics major, and I cannot decide if I want to go to grad school fro Astrophysics or Electrical Engineering; I love them both. I want to combine the two, and so my ideal job would be working on the electronics and technology used in space. I would love to work on projects...
  18. FuturePhysicist

    Fusion Reactor Power Supply.

    Hello, I'm 15 and very interested in physics. I'm building a safe nuclear fusion reactor as a science project. (I know how to safely handle high voltage and radiation) I have a question about the power supply. First off, I know that fusion takes around 40 Kilo-volts and it needs to have a...
  19. Sakurasus

    Engineering Electrical engineer & physicist, advice on PhD astronomy

    Hello everyone, I have read a lot of the post here about being engineers and going on into astronomy or astrophysics. Thus, decided to join and ask for advice. I have a similar experience but I have a unique problem. I have an BSc in electrical engineering from a US university with focus on...
  20. Sakurasus

    Hello! I'm an electrical engineer and a physicist

    Hello there, My name is Sara and I have an electrical engineering degree from an American university and a physics degree in the field of nanophysics from a United Kingdom university. I would like to move to the field of astronomy and astrophysics. I joined this forum to learn, share...
  21. B

    Quick Question: Switching Fields in PhD

    I am a senior physics BS student, applying to programs in condensed matter and high energy physics at the moment. However, I have always been interested in doing an MS in EE. Its sort of late this year though, and I can't apply for EE programs now. But that got me thinking: is it possible to...
  22. G

    Engineering Simple Circuit (RL circuit)

    Homework Statement Homework Equations iL = (iL(0) + Vs/R)e(-t/τ + Vs/R The Attempt at a Solution When the switch is closed before t=0, v(t) = 100V as the first 100Ohm resistor is shorted and L acts as a short wire in DC steady state. When the switch opens, v(t) = 50V by voltage divider...
  23. G

    Engineering Simple Circuit Problem (Clarification of doubts)

    Homework Statement Homework Equations The Attempt at a Solution I did a source conversion on the right-most 1A current source to get a voltage source to work with for this question. However, when I tried to work out the solution, my values seem wrong, but I don't understand why...
  24. G

    Engineering Simple Circuits (Electricity)

    Homework Statement Homework Equations ##v1 + v2 + v3 = 0## (KCL) The Attempt at a Solution I don't understand why my solution is wrong. I was taught that if I were to use Node Voltage analysis, I should put nodes with voltage sources into supernodes which was what I did, however, my...
  25. docsxp

    Help with AC Circuit containing a motor

    Hello, this is not a homework question, but is a past year exam question which I'm stumped at. Any help will be appreciated. 1. Homework Statement We're designing a current reduction system for an AC motor which is modeled as an inductor ##L##in series with a resistor ##R##. This motor is...
  26. G

    Autotransformer (Step-up)

    Homework Statement I require some help for part i for now. :) Homework Equations N1/N2 = V1/V2 N1/N2 = I2/I1 The Attempt at a Solution I tried doing the question like a normal transformer, but the result I got was vastly different from my teacher's. I also don't understand how my teacher...
  27. G

    Engineering AC Circuits (RL circuit)

    Homework Statement In the circuit shown in Figure Q2(b), two loads A and B are connected to the source. The cable connecting the power supply to the load is modeled as series R and L of values R = 0.1Ω, L = 0.1 mH as shown in the figure. The loads have the following specifications...
  28. G

    Engineering DC Steady State (RLC circuit)

    Homework Statement In the Figure Q1 (c), the switch S was closed for very long time before it is opened at time t = 0. Find the value of vC(t) and iL(t) at t = 0+ c L i.e. immediately after the switch was opened. Homework Equations V = IR The Attempt at a Solution From DC steady state...
  29. G

    Thevenin Equivalent

    Hi everyone. I need some help with regards to a question on Thevenin's equivalent. I attempted to solve it in 2 ways but I got different answers when I tried to do it another way. However, I am not sure of my answer as I do not have the answer key at the moment. The picture below shows one of my...
  30. S

    Engineering Confused about which field of Electrical Engineering to Go into

    I am a applied physics major with an emphasis in physical electronics (so basically I take a lot of solid state physics classes with my other normal physics classes), and I go accepted into a program where I start taking graduate classes during my last year of my bachelors (current year) and...