EEVblog

[@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. 👍

[@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.

[@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.

[@elitesennabubble]

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

[@cybernaut_ev3106]

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

[@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.

[@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!

[@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!!

[@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.

[@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! :)

[@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.

[@wejoji2955]

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

[@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.

[@fyfoh]

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

[@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!

[@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 !

[@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.

[@rjfontenotiii]

I've been trying to understand this stuff for two weeks now and after watching about a quarter of this video, it all clicks now. Perhaps I should send my tuition money to EEVblog because you are outdoing my university!

[@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!

[@stage666]

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

[@chitlitlah]

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

[@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

[@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)

[@alexisel1793]

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

[@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.

[@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.

[@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. 😄💕

[@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.

[@chemtype]

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

[@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!

[@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!

[@Mystickneon]

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

[@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".

[@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

[@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

[@MrMuahahahahaha]

These are so handy for a first year EEE student, thanks 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".

[@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!

[@jisupark9606]

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

[@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.

[@whydoineedtosignin5615]

An easier way is to always start in the lower left and take the terms as they come. -E1 + R1*I1 + R2(I1-I2) = 0 R2(I2-I1) + R3*I2 + 10 = 0 Same results with less jumping about. Either way still isn't as much jumping about as google made me do just to leave a simple comment.

[@Nordic_Mechanic]

+Why Doineedtosignin sometimes, google wont let me comment to my subscribers on my OWN video. What kind of workaround are you using ?

[@JB-kh7vg]

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

[@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!

[@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.

[@alexmiller6534]

that super position thingy is actually awesome

[@silverior]

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

[@aidan3734]

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

[@AlexanderBrevig]

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

[@harrydudley-bestow5222]

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

[@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!!

[@jmolesworth]

Va/30 0.333Va, it equals 0.0333Va.

[@jmolesworth]

OIC you corrected yourself at 14:05. 👍🏻

[@rcleveacp]

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

[@bharathb.p1506]

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

[@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.

[@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.

[@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.

[@annas7853]

I have ADD, but you hold my attention! I loved your video, thanks!

[@TheMRGHOSTKILLER]

Thank you very much! Best regards from Romania!

[@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.

[@kobusswart]

Very good vid series. Had to brush up on KCL and KVL to help a freshman student with homework. Not a biggie, but 0.1 + 0.05 + 0.333 = 0.4833 not 0.1833 so the final VA value is 1.13V and not 2.36. Thanks Dave for the great stuff you do so well.

[@ecospider5]

He was correcting a previous mistake. VA/30=0.0333. Not 0.333 If you put that in, his numbers are correct. He just didn’t correct his mistake earlier in the video he just fixed the math at the point you mentioned.

[@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.

[@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.

[@markusherrmann9681]

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

[@buckbrown823]

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

[@WeAreGRID]

I am really enjoying this, i was never taught anything about kirchhoffs laws, but it seems like it would be pretty easy, at least in my head, to do superposition theorem in my head, both at once: Starting at E1, 1 volt travels through 10 ohm resistor, so divided by 10, so .1 (similar to nodal analasys) then starting at E2, 10 volts, travel through 30 ohms, so .0333 volts, then half of .1 add to half of .0333 and go down through R2, so .0665 volts go through 20 ohms, so .0033325 Then, doing the rest of the paths, that .1 from R1 splits, .05 travels through R3, so divided by 30, .001666, meets up with the .0033325, making 0.0049985... then half of .0333 goes through R1, meets back up at the bottom... Then there is 0.4333 at the top of R2, and 0.0066635 at the bottom... Actually, this is way more complicated i think.

[@dariuszgoebiowski9216]

Big, huge bloody thank you, Sir!

[@10NA89]

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

[@shanuddin6876]

love your enthusiasm mate makes learning this alot more enganging

[@stevenweir76]

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

[@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!!!

[@boarnoah]

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

[@uwezimmermann5427]

The last method to analyze this circuit would be to replace the two Thévenin sources to the left and right with their corresponding Norton equivalents, calculate the parallel connection of the three resistors and the sum of the two current sources.... Or in order to just calculate I2, the current divider formed by the three resistors.

[@EEVblog]

+Uwe Zimmermann I deliberately didn't go into Thévenin and Norton in this one.

[@EEVblog]

+Aodhan Murray Probably, they naturally follow on.

[@williamhazelwood8288]

+EEVblog Yes please, keep it up!

[@uwezimmermann5427]

+Alter Kater, we use the Thévenin/Norton-equivalence all the time when working in analog electronics - when we use the hybrid-pi model for transistors, calculate the output resistance of an amplifier and so on. The advantage in the above described problem is that you can make step-by-step simplifications to the circuit, which only require single-line calculations and some re-drawings of the circuit.

[@tongordebeke1355]

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

[@sonniethuynh]

Please do thevenin equivalent circuit!

[@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. ;-)

[@rodbhar6522]

For the last example, after you calculated I(total) of 0.04545, it would have been simpler to get the nodal voltage. Just calculate the voltage drop across R1, then its super easy to get IR2 with IR2=V(nodal)/R2.

[@souravnag7334]

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

[@Arni142]

You saved my life with this episode!!!

[@cobrasvt347]

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

[@clodoaldorodrigues]

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

[@mikegrupe3694]

I'm in the process of changing universities because of the poor quality of teaching for electronics. I hope my next lecturer will be as half as good as you are Dave.

[@moolikethecow1172]

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

[@montreadormontrez9378]

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

[@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?

[@gamccoy]

Good video. Takes me back to my school days.

[@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!

[@nickguy6820]

I have always wondered how circuit sims worked, and why real-time analysis seemed so computationally expensive. Now I know: A whole white-board full of equations for each node, for every period in time analyzed. I am now also very impressed by my notebook's CPU.

[@markbell9742]

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

[@elizabethsusmann1969]

You made an addition error at 11:57. 0.1 + 0.05 + 0.333 in fact equals 0.483333 not 0.183333. Minor point but might as well point this out. Thanks, great vid as usual! A Bobby Dazzler!

[@KX36]

i use spice as a calculator for even non-electrical subjects.. drawing out equations in resistors, current sources and voltage sources satisfies something in me...

[@rodolfodavid188]

Big THANK YOU from México!!

[@peterke6170]

You saved my day. I dont go to class. Thank you sir

[@RagnarEE]

As some "young players at home" that have tried to follow the math, have shurely noticed the little error at 10:20 in the video. Va/30 is not 0,333Va but 0,033Va. Now all the math will be correct, and it gets corrected at 13:50👍😅

[@aaronlowe3156]

37:35 There's actually a Ti-84 & Ti-83 program available for download that solves resistors in parallel. I recently made one for the Ti-Nspire CX CAS (for a final I had for DC Circuits) and I intend to publish it.

[@kumaresankumar4070]

Excellent teaching sir.

[@Hilaly888]

Thank you sir! We need videos like this.

[@wpherigo1]

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

[@TheTarHeelTom]

How about a couple of capacitor related tutorials. First, a review of all the different types of capacitors, and the strengths and weaknesses of each. The next would be a tutorial about picking the values needed for different uses, especially the filters on power supplies.

[@duggiewest8181]

Thanks for sharing Dave. Good stuff.