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Hi this question asks what resistivity depends on.
If p=RA/L, I don't understand why the answer isn't length or cross sectional area.

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Hi,
Im curious as to why the magnitude of the impedance is still plus the imaginary term (even though j is squared).
for example, I expected :
if Z_L=R +jwL
|z_L|= sqt (R^2 - (wL)^2)

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Hi,
I've got a question regarding the final part of this question, where we need to find the capacitance if the power factor is 0.9.

I'm just a little unsure as to why the imaginary component of the impedance equation (from Q3, chapter 7) is taken without the denominator.  I would really appreciate some clarity.
Thanks!

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Hello. I am trying to do QB1 on the 2019/2020 exam. I am doing the circuit analysis for only the 15A current supply (in the picture)but cant see how they have gone from the original circuit to the simplified one. Why is the top 15 Ohm resistor in parallel and the 6 Ohm resistor in series with the 15 Ohm paralell combination? how would you approach the problem

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Hiya,
In a couple of questions in sheet 10 you give a Field Winding Resistance. I'm not sure I understand what this means or how to deal with it in the context of the questions.
Thanks!

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I am still a bit confused about how the module is going to be graded. Is it just 2 parts(AC lab and an online assessment in January) or three parts (AC Lab , online assessment chapters 1-3 and an exam in January)?

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Unfortunately you won't be able to improve anything from this feedback, but I just wanted to say how impressed I am with the videos.
It is clear to see you put lots of time and effort into them, and really do try and make this course as best as it can be.

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Hi,
Will we have to memorise/derive the equation for impedance in parallel (eg. and inductor and a resistor) when doing our exam? I had a look through the provided formula booklet but couldn't seem to find it.

This is the equation im talking about:
|𝑍| = 𝜔𝑅𝐿/ √𝑅^2+𝜔^2𝐿^2

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Hi adam, just wondering why for the second part of q 7 you use the pure resistive part of the impedence calculated before. surely now that the circuit is resonant, the capacitor and inductor cancel one another, leaving just the physical resistances left to consider. ie just a simple parralel combination of the 15 and 20 ohm resistors to find the current? doing this gave a slighlty higher current than what the soloutions gave.

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Hello,
Week 6 - First order seires LR circuits:
For the worked example with the frequency as 10kHz, when working out the magnitude of impedance, did we not need to convert the frequency to angular ie 2 * pi * 10000?

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In the post lab of Lab - Workstation Familiarisation, there are two questions by clicking the picture. I think there may have some probelms with clicking range accuracy since I lost 10 marks for one of them which I think I've done it correctly.

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Week 5b Slide, Week 6a Slide Impedance (2 questions)

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Week 5b Slide, Week 6a Slide Impedance (2 questions)

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Hello,
Week 5b question:
In the slide we defined Ip=C Vp w for Pure C, and Ip=Vp / w L for Pure L. Why can we define them as this? I tried to proof this but failed eventually.

Week 6a question:
The equation for Impedance is Z=R+jX.
Why do we multiply X with a complex number j? I do know the concept in Slide 5d but not sure how it is related to Z.

Thank you very much! :)

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I've had a few attempts with question 3 on this sheet, but I can't get to the right answer, could you point me in the right direction where to start??

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(2nd Chapter, Network Analysis, page 24, Kirchhoff’s 2nd Law)
In the first example, why is V2 negative? It's in the opposite direction of the current flow and, therefore, there is an increase in potential. Right?

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In the weekly content for week 1 folder, it is mentioned to look at the introduction videos if we haven't already. Was this just a recording of the in-person seminar, or are there some others, because I can't find them on blackboard.

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Nice first session, I'm actually interested in this EEE course now 😆

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Nice first session, I'm actually interested in this EEE course now 😆