EEVblog

Dave explains the fundamental DC circuit theorems of Mesh Analysis, Nodal Analysis, and the Superposition Theorem, and how they can be used to analyse circuits using Kirchhoff's Voltage and Current Laws we learned in the previous video here:
• EEVBlog #819 - Kirchho...
The same circuit is solved using the 3 different methods. Will we get the same answer from each technique?
DC Fundamentals Playlist: • Electronics Tutorial -...
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[@Educ8s]

Dave, as I used to be a professor in the past and a student for so many years, I can clearly see that you are a very talented teacher. We are all very lucky to live in this time that the internet allow people to share knowledge easily and even luckier to choose from the best of the best teachers out there. In my opinion you are one of the best I have came across. Please keep it up!

[@AfterMathGreifing]

I wholly agree with you. As a college student myself youtube is an amazing resource. I missed the second lecture of my weekly Engineering Circuits class which made me stumble upon Dave's channel. He's a better professor then plenty of the ones I've had in the past.

[@jeffcard3623]

Dave, I would submit that your ability to present such material in a logical manner, with the maximum clarity and enthusiasm evoking the hallmarks of the best educators and university professors. 👍

[@garythecyclingnerd6219]

I paid $7,500 in tuition + $750 in books this semester yet this video gave a better and more engaging explanation in a little over 40 minutes for free. Thanks for the video! You're teaching style is very good and even entertaining.

[@smrtfasizmu6161]

I listened to my professor in middleschool explain this, I have listened to 2 professors in highschool explaining this, my dad explaining this to me, I have read explanation in highschool and middleschool physics books and I have never seen a better explanation than this one.

[@hhislv582]

Hi there. I would like to thank you for your videos and more specifically for your Friday's. Indeed, it's been two decades since I've put my head through this sort of thing and the refresher was more than welcomed.

[@davidalfonsomixfuentes2776]

Hi, Dave... it's a very nice tutorial. I'll tell you something... Here in Chile teachers spend a whole semester teaching this to the students. You made it in 2 short videos!!... I don't know much english but i really understand it more than all the teachers who was teaching me this things here and IN SPANISH. Finally, the most important thing is to make clear explanations like you do... You must post more fundamentals!!... I love those videos!! Best regards. David Mix

[@EEVblog]

+David Alfonso Mix Fuentes Thanks, glad you found it understandable.

[@davidalfonsomixfuentes2776]

EEVblog Thanks to you, just keep going... You are going too far!...

[@christopherjoseph651]

David, although this is a good video to teach you the basics of these methods there are more complex applications that were not covered including Super-Nodes, Super-Mesh, Dependent Sources, System Gain Matrix (the real reason you apply super position), Referring the Reference back to Signal Ground, so that is why you need an entire semester to teach circuit analysis.

[@davidalfonsomixfuentes2776]

@@christopherjoseph651 hey!... just saw your comment now... 😅 The fact is that we don't cover the topics you mention and the topics explained in the video in a whole semester, even in the career 🙁. Here teachers have to explain all that in a whole year, so as you can see, the learning curve is worse. I am much better than my team mates. Greetings!!

[@rtgf9568740pop]

Since the world is ending, I've decided now is a great time to get back into electronics. Your videos are a great help, and I really wish I could send this video back 10 years into the past. Thanks Dave!

[@USSEntrprise]

Mate. I was 3 weeks behind on circuit analays for my engineering class, what the teacher tried to do in 3 weeks, you did in 30 minutes. did all the homework in one day. thanks! :)

[@cybernaut_ev3106]

Clear, easy-to-understand explanations. You put professional teachers to shame. Thank you.

[@elitesennabubble]

the enthusiasm and energy you bake into these videos makes it so much easier to learn

[@caribbeankpoplover]

Your explanations are sooo easy to understand and you always seem so exited so I never get bored and actually pay attention! God bless you for these videos man. 😄💕

[@littlesilver3]

Great video Dave. Felt like I was in first year EE theory all over again. Its been at least 15yrs since I seen loop analysis in front of me. Oddly enough I was packing up some boxes and came across my first year theory text book and one the tabbed pages was loop analysis. Keep up the great work!

[@MohamedAshraf-xr6zw]

I would like to tell you that, you're the most TALENTED teacher or facilitator I've ever met in life !! I was really upset because of my circuits course but after listening to your tutorial it becomes really EASY PEASY :))) Thanks for your exerted efforts, keep moving forward, you're BRILLIANT (Y)

[@ZwiazeCie]

That's just a really amazing tutorial. Really, you tell all what's needed. And with such clarity. Crazy stuff made as easy as it goes. Thank You Dave!!

[@jisupark9606]

Just wanted to say I cannot thank you enough Dave. Great video and Keep it up!!

[@RTD553]

Nicely done Dave. Students get confused about these analyses because educators don't use reasonable, consistent and intuitive conventions. All of those you adopt are clear and reasonable. You wouldn't believe the complete hash some 'experts' make of these explanations on KZbin. Your explanation of voltage multipliers is also excellent. Nice work.

[@todarfclips]

Wow, looking back at my problems and figuring out what you did vs what my teacher did, your method is much simpler and saves a lot of skippable steps. It also reduces the amount of errors I make. I feel like my teacher thought he should explain everything from the very bottom but it's just too complicated in the end. Thanks !

[@yousef1419]

I’m now managing to work through these examples by myself and getting the correct answers. When I first saw this stuff a couple of years ago I thought it was quite an effort to learn and I’d just use a simulator instead. I can say now that even if I don’t ever use this stuff it’s given me a real idea of what’s going on in a circuit and things are starting to ‘click’. That definitely wouldn’t have been the case for me without learning this stuff so it really is well worth the effort. I draw up a schematic on paper then find all the voltages and currents then check it against a simulator to verify my answers, very satisfying when the answers match up. These videos are such a big help!

[@ArifulIslam-qw6lf]

Just started circuit analysis at school, and got a little frustrated with how my textbook approached everything. But this video did the trick. Massive thumbs up.

[@StateofElectronics]

Really great explanations of circuit analysis Dave. The last time I heard most of this was in Physics and Maths B at High school back in 1986! I loved this stuff back then and realise I still do!

[@toast_recon]

I'd been looking forward to you doing something like this for probably a couple years now. Of course, you come out with it just a month after I learned and was tested on it in university. Thanks anyway for the video! I'm sure it'll help a lot of the "young players".

[@JB-kh7vg]

great video!! i've learn so much that i probably have to watch it 3 times more before i remember it all!

[@aidan3734]

This would have to be one of my favourite videos by far!

[@PeterCCamilleri]

Wow! Simple clear presentation. If only other educators were as interested in teaching. I suppose it goes to the core competency or rather incompetency.

[@wejoji2955]

7yrs ago and still a big help for students who's struggling to learn this. Thank you

[@silverior]

Excellent explanation as usual Dave. This will go to my bookmarks for future reference.

[@montreadormontrez9378]

Love the fundamental Friday vids, Dave. Excellent teacher! Hopefully some more next week?

[@chitlitlah]

We just covered this in physics and I have a test on it in about 30 hours. What impeccable timing!

[@cepwin]

I’m taking an online class on DC Circuits and really struggled with the mesh/ node analysis assignment...this video and the previous video are very helpful!! It also shows why you have to be so precise working the algebra....very easy to make a sign or calculation error and get a totally wrong answer.

[@AlexanderBrevig]

Nice video Dave! As a programmer with no formal education I always love the fundamental Friday videos :)

[@markusherrmann9681]

Hy Dave, another very good fundamental friday video. Please go on making more of this.

[@LassiLehtisyrja]

This is perfect. I'm currently going through these exact models in my EE minor at uni (technical physics major) and I'm having a hard time getting a grasp on them, especially on the nodal theorem. Thank you for this video, Dave!

[@ickipoo]

Nice one, Dave. This stuff was one of my favourite bits of first year electrical engineering. Suddenly I realised the point of all the stuff I had learnt in high school - algebra, complex numbers, matrices - and I started thinking about writing my own simulator, until someone said "yeah, it's called Spice".

[@rcleveacp]

Love it. Great return to school. I might have to find my old test books. Oh the memories. Great job.

[@Sterno3742]

You've got perfect timing, Dave! I just got home from my semester 1circuits midterm in my Electronic Engineering Technology program which covered Mesh, Node, Superposition, Delta-Wye, Thevenin, Norton and capacitors in DC circuits. Keep making tutorials, Fundamentals Fridays are some of my fave videos.

[@fyfoh]

Add me to the list of people who really needed Dave's explanations when I was an EE freshman.

[@agheermarial9882]

thank you for the help. i couldnt understand these methods in text books but you funnily help me out. no longer fearing my circuit exam next month

[@alexisel1793]

wow.... you are by far The Best teacher I`ve ever seen. One big Thank You!

[@fierymongoose9945]

If anyone is wondering how to solve the nodal equation at 9:00 without using decimal approximations, the method would be to multiply both sides of the equation by 60 (the lowest common denominator of 10, 20, and 30). This yields 6Va - 6 + 3Va + 2Va - 20 = 0, 11Va = 26, Va = 26/11 (~ 2.3636).

[@Lasseu]

@me calculating with AC network analysis and i found decimals to be hard to use with polar complex plane, so i just simplified it straight to have Va as output. So i had to use method you suggested here, but i had symbols instead of decimals => even better ;) . KZbin is just amazing tool for learning.

[@alexdevincenzo4048]

I love your tshirts! Great videos by the way! Very easy to understand and I like how you have points where you can pause the video and do the calculations yourself.

[@elendilion]

Nice! I was strugling with nodal analysis and began to watch a few videos on it. After watching a video with a guy who didn't seem to enjoy talking very much, a german lady, and a korean kid, I was pleased to find out that Dave had made a video on the subject. His videos always leave me satisfied, beause you can tell by his body language and his voice that he really enjoys doing these videos. :3

[@StellarMoig]

I JUST HAD MY MID-TERM ON THIS TODAY. I stayed up all last night trying to wrap my head around Nodal Analysis! Wish I had your video then! Hopefully I did OK. Great video! Should be helpful for the final!

[@robbs96]

hahaha. Nice BTTF reference at 34:00 anyway... you explain things so well! you make me really GET IT. your Fundamental Friday about op-amps helped me ALLOT too. I like your teardowns and mailbags, But PLEASE OH PLEASE bring us more Fundamental Fridays! Love your channel and the Amp Hour too. thanks Dave!!!

[@moolikethecow1172]

I love this man. Also the Australian accent is icing on the cake. Great tutorial, thanks!

[@michaelcox3745]

You sir made this so much easier to understand. I do hope you may consider doing a video with at least another loop, using matrix/determinates to solve.

[@MrMuahahahahaha]

These are so handy for a first year EEE student, thanks Dave!

[@cobrasvt347]

Thank you for taking the time to explain. thumbs up !

[@10NA89]

Man i am glad i found your videos, node analysis was not getting anywhere for me till now haha.

[@Mystickneon]

I would say that you've missed your calling as an educator, but you're missing nothing. Great job, Dave!

[@bharathb.p1506]

I had forgotten all these concepts..,.. thanks for this video.Very helpful!!

[@TheMRGHOSTKILLER]

Thank you very much! Best regards from Romania!

[@stage666]

I have never studied electronics and have no idea what hes talking about, yet I can't stop watching this

[@shanuddin6876]

love your enthusiasm mate makes learning this alot more enganging

[@PwrElec]

Great video! My experience says that students like to see the polarity across the load. I understand, helps with the understanding of conventional current flow.

[@dariuszgoebiowski9216]

Big, huge bloody thank you, Sir!

[@chemtype]

I literally wrote a college exam on this 5 hours ago. WHERE WERE YOU WHEN I NEEDED YOU!?!?!

[@duggiewest8181]

Thanks for sharing Dave. Good stuff.

[@mayenmakuoldeng7306]

Thanks all away from Suez University. I had suffered understanding these due to Arabic since I am from English educational background. I hope you could be my professor. looking forward to learning more from you.

[@Arni142]

You saved my life with this episode!!!

[@Hilaly888]

Thank you sir! We need videos like this.

[@dixingxu]

Amazing tutorial! Thank you for uploading this video! :)

[@BLUFFIRL]

it's crazy I'm part of the first semester of students to be able to watch this video while learning it, who knows how many people this will help in the future

[@analogueelectronics5067]

That was a whole lot of fun and nostalgic to. Thumbs up all those who did all this at Uni and have never ever used any of it in their career. ;-)

[@clodoaldorodrigues]

Thank you for the explanation, you turn the things easy.

[@tongordebeke1355]

Dear Dave, Thanks for the lessons, now I get it. magic Ton

[@lpcustomvs]

Oh my god, you are a Saint! I just started electronics engineering college. You explained it 100 times better than my lecturer! And having your accent :D just messin' with ya', been watching your videos for 2 years :)

[@EEVblog]

+Tomasz Górka Glad to hear, thanks.

[@biggrey54]

Great video Dave

[@henningschaferhoff1533]

Although this was nothing new to me i hope you will continue making more fundamental Friday Videos!

[@dalriada842]

+Henning Schäferhoff It's great for refreshing the memory.

[@gamccoy]

Good video. Takes me back to my school days.

[@nickhill9445]

Dave, love this sort of thing. The math is so important, and this importantly underlines it. I did take up your challenge of solving it without Kirchoff's laws. My approach was to consider E2 and R3/R2 as a power supply. Therefore having a supply voltage and impedance. then R1 and E1 effectively as a resistor in series with a 1v zeener connected to the power supply. Another area of interest may be the interaction of resistance, and capacitive and inductive reactance. The AC voltages across the components of an RC or LC network don't sum to the measured voltages but sum to a pythagorean formula.

[@GmPaladium]

I would have needed this tutorial around a year ago to not switch my classes. But anyways great tutroial and basics :) Continue your great work!

[@harrydudley-bestow5222]

Gee thanks Dave for making these tutorials ABOUT ONE WEEK AFTER MY ELECTRICAL EXAM!

[@markbell9742]

By George, I think I've got it! Great tutorial, thanks. And, 'whilst', hadn't hear that for a while. Cheers, Mark *****************************

[@rodolfodavid188]

Big THANK YOU from México!!

[@stevenweir76]

So you made a circuit to overheat and blow up the battery on the left. Good job! I appreciate the video, good refresher. :)

[@davalrichardson5901]

great video! big up from Jamaica.

[@elandrildoendur1579]

Great video, Dave! I'd just like to point out that the mesh analysis already uses the superposition principle (on R2 in your example). What you explicitly named as superposition method is actually just the same as the mesh method with slightly shifted mathematical terms. For more complex circuits most simulation software programs actually use the pure Kirchhoff's laws and construct a equation system, which then can be solved very quickly by matrix inversion. With this systems with hundreds of components can be solved in fractions of a second. Also the equation system has the advantage that they can be used for sources with AC and even arbitrary waveforms.

[@souravnag7334]

thanks a lot sir for the videoes............it has cleared all my confusions on KCL and KVL.......please do post some more.

[@buckbrown823]

Very great stuff for a VSL ( very slow learner). Thanks!

[@boarnoah]

Cheers, a little late for me, can't wait to see more fundamental fridays hopefully on more AC related stuff (phasors etc..)

[@sonniethuynh]

Please do thevenin equivalent circuit!

[@AdhityaMohan]

Literally saved my semester thanks man :)

[@anthonycalia1317]

Nice job explaining!

[@wpherigo1]

“I’ll give you one guess!” Hilarious! Well done, Dave.

[@kumaresankumar4070]

Excellent teaching sir.

[@alexmiller6534]

that super position thingy is actually awesome

[@rejierecto1031]

Thank you for making it easy ❤

[@MichaelLloyd]

Outstanding video

[@ESPPsycho]

Nice! About two years too late in my case :P Will be nice for people starting EE classes in school.

[@jakejakeboom]

+Flylikechris Same here, how about some BJT/MOSFET analysis tutorials?

[@brabhamfreaman166]

Hmmm, yeah except 1/3 is not 0.333 or any finite string of 3’s. Be careful when translating fractions to fractions. The cleanest route from your nodal analysis equation is to multiply the entire equation through by 30 to eliminate the fractions. It’s not too scary since the RHS is 0. Btw, I love ur down-to-Earth teaching style - it’s so accessible and unintimidating. My background’s in Mathematics, but naturally also studied Physics too, including Electrical circuits. Your passion is infectious!

[@westsidejatt2]

great teaching, thank you!

[@SebastianVJ]

Thank you,very helpful tutorial

[@strajee]

Thank you Dave!

[@rlamb51]

Third term, VA/30 = 0.0333VA, Use Kirchoff's Voltage law to test your answers. Belay may last you caught it at about 14:16. Dang I thought I had you. By the way, it is refreshing to see something besides a mail bag or another equipment teardown. Takes me back 47 years to high school.

[@ericcartmann]

Thats right. Teach us this 3/4 into the semester. Literally wrote a test on this last month.

[@sidaliadjou]

same here

[@DavidTelesPortugal]

+Eric Cartman Yes made a test about this 3 weeks ago.

[@edwarddjan8319]

Thank you so much for the video.

[@EDFUNKID]

This video help me a lot ,thank you so much

[@SatyajitRoy2048]

LTSPICE simulation gave the same result as it supposed to. Everywhere its just repeater :) Its brilliant video as always. Hope to see more fundamental things especially for the real world kind. Such as more deeper aspects of OP Amp with validation with your advanced gears that you have. You already have many opamp series, but need some more. Also sme RF communication stuffs would be great things to watch. You have tear down Tuesday and fundamental Friday so Wednesday could be good day for sharing design ideas or how to enhance the designing skills etc.

[@iNDREI_Ro]

:V The R2D2 part was magic. Good one!

[@probablystalkingyou]

This is why I'm subbed.

[@skycarl]

Thanks Dave, these were great......Carl