# Recent content by Granger

1. ### 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. ### Engineering Parameters of transformers: open and short-circuit tests

@gneill can you help me? please?
3. ### 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
4. ### 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
5. ### Engineering Parameters of transformers: open and short-circuit tests

Can someone help me please? :(
6. ### 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...
7. ### 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...
8. ### 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 ->...
9. ### 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...
10. ### 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 :)
11. ### 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 :/
12. ### 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...
13. ### 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...
14. ### 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?
15. ### 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?