ELEC 202/01 - Complex Numbers in Electrical Engineering

[@anescaid]

me 5 years later from another country that didnt understood what was my professor was talking about , man i feel this video was made for me huge thanks to you.

[@DucatiMTS1200]

Superb explanation - I wish I had a teacher like you 30 years ago. Now I see purpose and logic for use of complex numbers. Sincerely thank you very much sir for taking the time and effort to impart this knowledge!

[@miketony2069]

This was AMAZING!! Like some of you I was taught this many years ago and it never really "stuck". I see so many of these wonderful lectures on KZbin and realize so much of higher education is flawed - it's a form of throw it against the wall and see what sticks. This teacher takes the time to connect the dots In a non-threatening, non-egotistical manner. Many times I wanted to ask questions as a youth in class and was made to feel embarrassed, stupid, or I was just interrupting them. I, like so many other viewers WISH my professors were this thoughtful and clear during my studies.

[@rolinychupetin]

WOW! I would blush at the compliment if I were some years younger. Many thanks for your enthusiastic support.

[@abdalqaderathamna3147]

Wonderful lectures . I'm a fresh graduate energy engineer and we didn't learn these concepts in this very clear way , Thank you very much for this effort.

[@rolinychupetin]

Thank you, Mr. Athamna. I invite you to watch the other five videos in this mini-series, ELEC 202. I just finished the series this morning. I joined them in the playlist kzbin.info/aero/PL1-PpkqcSWX52MulYcJ2V_GBjTVbb-S-5

[@ProfessorMastermind]

Loved the lecture . Very engaging . Such teachers are a rare breed .

[@timothyjudson9191]

Lol, I wish I had read the description a few hours earlier. Great video though, this is helping me so much in circuits; hands down the best channel I've come across for ECE so far!

[@mavaddat]

Hey! L.R. Linares was my electrical engineering prof at UBC! Great teacher. I just happened to google this topic to remind myself how complex numbers are used in circuit analysis. I am a software engineer now, so I don't do circuits much. I just like to remind myself about things that I used to know. Thank you Prof Linares!

[@rolinychupetin]

Glad to hear from you, Mr. Javid, my colleague.

[@adaonielsen6143]

This is the greatest accent of all english language

[@MickeyDJ1]

It has been almost 20 years since I completed my BSc. (Electronic Communications), which I never really used directly. However, whilst revisiting for curiosity, I find your lectures and teaching personality/style very much a joy! Unfortunately, I could not have said that about the vast majority of the lectures I attended. Typically very dry information dumps for us to go away and make sense of. I'm not naturally academic and so learning was painful much of the time. Had I attended lectures/tutorials such as yours, I feel sure I would have certainly found much more "Joy" in learning. Best wishes from the UK. :)

[@rolinychupetin]

Whoa! Thank you! That is really high praise, coming from a seasoned colleague. I had the fortune of sitting in the class of very gifted researchers, the late Prof., Szponka and Prof. Martini (whose names you may hear in some of my lectures, particularly the one on the use of Bode plots to explore the frequency response of circuits). Happy New Year 2018, please have a toast to my good health!

[@stanleychytla3786]

Greetings from Illinois, USA. I am pleased to see you back on KZbin with excellent tutorials. Looking forward to more videos as your course progresses. Thanks.

[@rolinychupetin]

Thank you, Mr. Chitla. It is good to be back. I have two more videos in the oven, and other two still in their embryo-stage. I hope to "shoot" one of the "oven-ones" sometime soon. Greetings and a Happy New Year from Vancouver, B.C., Canada.These comments on KZbin are a bit like QSL cards to me.

[@stanleychytla3786]

rolinychupetin While your videos are intended to assist your students, I believe they have a much wider appeal among those of us who appreciate science and physics. Your methods for teaching are exceptional in their clarity and efficiency. Thanks again for all of the effort that you must put into production of these videos.

[@rolinychupetin]

Thank you kindly, Mr. Chytla. Most appreciated. Truly.

[@Cu_Ty_Pro]

I subscribed to your channel just because of how your voice sounds. I'm taking electrical engineering courses, and the very first 202 seemed a bit out of this world for me, but with this lecture, I'm halfway through your video, and already felt like I'm getting it. Thank you. I'm going to check out all your videos about EE in a couple days. Thanks :)

[@TechTins_Projects]

Did the Oracle really say to Neo "Know thy complex numbers?" cool if he did. This is a lovely teaching video! I know this stuff but still enjoyed it very much. Your videos are so entertaining. Makes me smile.

[@rolinychupetin]

Heh, not really! What the oracle did was point at a wooden sign on top of his kitchen door with the aphorism "Temet Nosce", a Latin version of the original which according a Greek historian as written in the forecourt of the temple of Apollo, "Know thyself", in Delphi (it's a great circular reference that the brother Wachosky make of the oracle referring to itself, the Oracle of Delphos.). Some people associate this saying with Socrates who expounded on its implications, but that seems to have happened at a later date.

[@rolinychupetin]

Blah! Wachowski brothers. Sorry!

[@TechTins_Projects]

How weird! I am reading plato's republic at moment!!! Are you Greek as well?

[@rolinychupetin]

My belief is that the same way as there is a little Irish in each one of us, there is also a little Greek in each one of us. If not in our bodies at least in our minds.

[@RanLevi]

Excellent explanation! Thank you very much, so much appreciated :-)

[@isacdaimary9908]

Just wow !!! Thank you for uploading

[@rolinychupetin]

It's my pleasure

[@hasnounimohamed4710]

good wather comes from good source Excellent thank you

[@rolinychupetin]

You are welcome

[@crazzanthictlabbar1056]

If you were my professor in 1998, I might be a robotics engineer right now. I'm grateful for what I am, but it's not exactly what I wanted to be.

[@Vk-gv3sc]

luv ur lectures

[@rolinychupetin]

Thank you. Are you in America, in Europe or in Asia?

[@Vk-gv3sc]

Asia(India preciesly)

[@rolinychupetin]

Thank you for responding, Mr. Kumar, it is important to me to know where my fellow travellers watch me from, on this spherical starship, Earth. I wish you a Happy New Year 2018 from Canada. We are almost done with 2017, it is Dec 30th today.

[@superbros1690]

Do you have videos for digital signal processing, or automatic control system.

[@rolinychupetin]

I am afraid I don't. Sorry. I am convincing my colleague and neighbor, who's been teaching automatic control theory for many years to join me in putting together a video. I would provide the video-making experience. Sadly, he is not too keen to be videoed.

[@superbros1690]

@@rolinychupetin Oh well thank you anyways for the great content you have here, your content is highly appreciated.

[@ddee2501]

You won me at Klingon numbers... you are with honour.

[@rolinychupetin]

nuqneH

[@onueziwembotho1353]

Very much appreciated thank you sir

[@honestman276]

Thanks. From Bangladesh.

[@lillyzegarra8025]

how do you get a lower case j on the hp prime calculator. I can only see the capital J in orange. please respond. Thank you.

[@rolinychupetin]

ALPHA SHIFT

[@lillyzegarra8025]

Not a minute later after I sent you this message and right before i went into cardiac distress, I figured it out. Nevertheless, I still want to thank you for reponding and sharing some of your super powers with me. By the way if you're still not sick and tired of all the compliments, I have to say your videos paint a panoramic portrait of the subject at hand in all its glory. You always seem to have much to discuss and your themes are all for enlightement. @@rolinychupetin

[@joshuahund3124]

Has anyone else had issues getting the shift+multiply to show polar to work? It's not converting the output for me.

[@rolinychupetin]

That works only in "calculator" mode, not in CAS, as far as I know.

[@AnilZonderPunt]

Hi, thank you for your lecture! I was wondering, do you know around what year or by who the utility of complex numbers in electrical engineering got noticed? I'm asking to get a sense for how long complex numbers had been deemed useless, after its early conception by Cardano. Thank you in advance!

[@rolinychupetin]

In Electrical Engineering, it happened when Charles P. Steinmentz, the true father of modern EE published a paper on July 1893. Let me copy verbatim from Wikipedia's article on CPS: "...Steinmetz's work revolutionized AC circuit theory and analysis, which had been carried out using complicated, time-consuming calculus-based methods. In the groundbreaking paper, "Complex Quantities and Their Use in Electrical Engineering", presented at a July 1893 meeting published in the American Institute of Electrical Engineers (AIEE), Steinmetz simplified these complicated methods to "a simple problem of algebra". He systematized the use of complex number phasor representation in electrical engineering education texts..."

[@AnilZonderPunt.]

​@@rolinychupetin Thank you so much! That paper was released more than 300 years after negative roots had first been noticed. That's such a long time!

[@agaelema]

Hi professor, another excellent video. There is some video, material or tip showing how to solve the penultimate problem manually (without this powerful calculator)? I tried to solve here, but the result be wrong. Thanks

[@agaelema]

Hi professor, I think I found the problem. There is a little mistake in the equation of calculator, Is1 was forgotten. Excluding it, the result is the same.

[@rolinychupetin]

That is correct, Mr. Agaelema. The one slide active at 30.22 contains more than twenty screenshots of the HP-PRIME emulator, they got mixed up, my guess. I have reported the typo at the end of the video description, along with the correct numerical value of Vo. The procedure is correct. If you were in my class, I'd give you a bonus-point, one extra mark in one of the ten homework assignments. Accept my symbolic "bonus point". Good work!

[@agaelema]

Hi professor, unfortunately I'm not in your class, but I'm, a fan of your videos and didactic on youtube. Greetings from Brazil

[@maani315]

Sir G tusi great o🙏🙏🙏🙏🙏

[@sohailjanjua123]

Hi Roliny, I your lecture . Thanks

[@rolinychupetin]

I'm going to assume that you meant to insert a heart emoji in there, and click that ... I thank you for your kind feedback.

[@elgatito00]

Loved it ✌️

[@zyt6201]

Great ! thank you

[@TheTariqibnziyad]

Damn... best teacher ever !

[@Josh-xe9ux]

🙏Thank you

[@rolinychupetin]

You are so welcome

[@aagrafio]

Excellent video. Bravo! But... I think it needs an improvement here: You take for granted that an inductive impedance is a positive imaginary and a capacitive impedance is a negative imaginary. But you must show why.

[@rolinychupetin]

Well said, Lone Ranger. However, at this stage, the first lecture of the term, we are only revisiting the arithmetic and graphical representation of complex numbers. The electrical engineering is merely circumstantial. The following lecture, "The Genius of Steinmetz", is where phasors and complex impedances are presented formally. It's a bit of the horse behind the cart, but it seems to work in a classroom.

[@macmarc6661]

I just had to learn about impedance for my electro chemistry class, but after this video I feel like an electrical engineer.

[@rolinychupetin]

*High Five*, sorry no emojis here :) Thank you for the kind words.

[@awolgeordie9926]

This is excellent.

[@nooneknown]

there are as many complex numbers as real numbers

[@rolinychupetin]

Actually, if you come to think of it, there are more complex numbers than real numbers, as per each real number, there is an infinite number of complex numbers with that real part. It is said that even both sets are infinite, the level of infinitude of complex numbers is higher than that of real numbers.