Search results

  1. G

    Courses Electrical Engineering: what study path would be better?

    Hey guys! So basically I'm still finding hard to decide what my specialization field should be next year. I'm really torn between a major in Electronics with a minor in Power Systems with some programming additional courses OR major in Power Systems with minor in Electronics. My favourite...
  2. G

    Engineering Parameters of transformers: open and short-circuit tests

    I expected to get 27,6 mH By doing what you guys said I get to a turns ratio of 2 (dividing the voltages voltages). That means the current I2rms is 2 times current I1rms equals to 10V. That means L22 = LM/2 = 15.9 mH
  3. G

    Engineering Parameters of transformers: open and short-circuit tests

    Thanks for your contribution but that is wrong :/ It makes me obtain a wrong value for L22
  4. G

    Engineering Parameters of transformers: open and short-circuit tests

    1. Homework Statement Ok I have the following circuit and data (when the subscript is "ef" it means "rms" values): I am asked to determine the parameters of the transformer r1 L11, L22 and LM with the given experimental data. 2. Homework Equations 3. The Attempt at a Solution I had...
  5. G

    Balance of forces: confusion

    1. Homework Statement 2. Homework Equations So I basically have to establish the non linear differential equation that governs the movement of this robot (relates d and theta): 3. The Attempt at a Solution So I know that we should have the sum of torques equal to...
  6. G

    Dot convention inductors in series: equation confusion

    1. Homework Statement So I'm really confused with mutual inductors and dot convention. If your answer is going to be a link to any website I can assure you I read them all and that only left me more confused. So here are my questions: 2. Homework Equations 3. The Attempt at a Solution ->...
  7. G

    Confusion about the direction of the vectors: motional EMF

    1. Homework Statement I'm working through an example with motional EMF and I'm having trouble understanding the directions of vectors so that I can apply induction law. The magnetic circuit seems complex because the circuit is used to analyze other situations but the air gap 3, the coil 3 and...
  8. G

    Mutual inductance coefficient with so little info

    Holy cow I just checked the document with the books mistakes and yup it should only be a symbolic result. Well at least all this time made me understand the dot notation which I wasn't really understanding so thanks :)
  9. G

    Mutual inductance coefficient with so little info

    I'm only told that I have a sinusoidal current but not a single value is provided... There must be another way :/
  10. G

    Mutual inductance coefficient with so little info

    Ok, so I looked on some tutorials on the internet and I'm more familiar with the concept now. This leads me to obtain: $$ \frac{\psi_1 \psi_2}{I}=L_1 + L_2 - 2 |L_M|$$ Where I take the absolute value to reinforce that we have discordant coupling (because of that the value of the mutual...
  11. G

    Mutual inductance coefficient with so little info

    No I haven't :/ That's why I'm missing something here. I came across the formulas for coupling inductors: $ L= L1 + L2 + 2M $ $L = L1 + L2 - 2M $ And didn't understand where they came from and the meaning of them. Maybe it has something to do with that dot notation? Do you know where I can...
  12. G

    Mutual inductance coefficient with so little info

    I meant that B is directed to the right on the windings on the right and to the left on windings on the left! I'm sorry I'm not getting there, what does place the dots even mean?
  13. G

    Mutual inductance coefficient with so little info

    For what I understand it is leftwards on the left windings and rightwards on the right windings, correct?
  14. G

    Mutual inductance coefficient with so little info

    1. Homework Statement I have the following circuit: The two inductors are connected in series are characterized by internal resistances R1 and R2 and self-inductances L11 and L22. The magnetic coupling factor between the inductors is k = 0.75. The inductors carry the same current i. What...
  15. G

    Two voltmeters in parallel measure these different voltages

    1. Homework Statement I'm currently studying induction law and circuits with inductors. I came however with the following circuit: [1]: https://i.stack.imgur.com/ghaiE.png 2. Homework Equations 3. The Attempt at a Solution Now my text says the following: "Unlike what your intuition...
  16. G

    Modeling a third order system

    1. Homework Statement Determine the parameters of the PI controller such that two of the closed-loop poles of the transfer function Gclr(s) correspond to the poles of a second order LTI system with the following specifications: i) overshoot S% = 25%; and ii) settling time ts(5%) = 120 s. 2...
  17. G

    Transmission line: leakage current differential equation

    Really can't anyone help me? I've been around this problem for an entire day I'm losing my mind with this, it must be a simple math trick I have no freaking idea about...
  18. G

    Transmission line: leakage current differential equation

    1. Homework Statement I have a coaxial cable with internal conductor of radius r1 and external conductor of radii r2 and r3. The material of the conductors has a conductivity ##\sigma_1##. Between the conductors there is a imperfect dielectric of conductivity ##\sigma_2##. Consider the...
  19. G

    System of multiple conductors: image method

    1. Homework Statement The following figure represent the traversal cut of a system with two cylindrical equal conductors of radius r0 length l at a distance d from one another and at the same distance h of a plane conductor (conductor zero). The dielectric that surrounds the conductors is the...
  20. G

    Partial capacitances of a system of conductors

    Hey berkeman! Thank you for trying to help. Yes partial capacitances are a little bit different than "regular capacitances" (i.e. the capacitances that figure out on a capacitance matrix). What my book says is " An alternative method – the so-called partial capacitance scheme – consists of...
  21. G

    Partial capacitances of a system of conductors

    1. Homework Statement I have a small question about the following problem. The figure represents the cross-section of a three-conductor system comprising a communications coaxial cable of length l running parallel to a conducting wall (reference conductor). Determine the partial capacitance...
  22. G

    I 2 definitions for voltage, how are they equivalent?

    U is the voltage between points a and b. Exactly that's my doubt, are both expressions correct?
  23. G

    I 2 definitions for voltage, how are they equivalent?

    My question is that in both cases the expression is presented as "the potential difference between points a and b". However if I use both definitions will I obtain the same result or will I obtain symmetric results? I'm thinking the later is probably the correct one but now that leaves me with...
  24. G

    I 2 definitions for voltage, how are they equivalent?

    So I'm studying electrostatics and I came across to two different definitions of potential difference/voltage (because we're in stationary regimes) and I'm having trouble understanding how the expressions are equivalent. They are for a voltage between point A and point B $$U=V_a - V_b...
  25. G

    Studying How to improve in engineering exams

    Hello! Thanks for your reply. This semester I was taking 8.02 Physics (Electromagnetism) and tried to revise every problem I do, to check if I was really understanding the physics of the problem and I think it helped. However yes on tests I freeze when I come up to some "different" problem. It...
  26. G

    Studying How to improve in engineering exams

    I don't know if this is the right place to put this, but here it goes... I'm here to ask you what advice can you give me to achieve better results in engineering. I'm currently on my 5th semester and I'm still not managing to get good results. I really put effort on things, prepare myself...
  27. G

    Magnetic energy stored in a cylindrical conductor

    The goal of the exercise is to do the opposite e.g. determine E and then use that formula to get L. I didn't post that last bit because it was not relevant for the question I guess.
  28. G

    Magnetic energy stored in a cylindrical conductor

    1. Homework Statement So I came across with following problem: > Consider a cylindrical conductor of infinite length and circular section of radius a and that is traversed by a stationary current I. What is the magnetic energy stored in the conductor. 2. Homework Equations 3. The Attempt...
Top