Nodal Analysis Example Problem #1: Two Voltage Sources

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Күн бұрын

This tutorial works through a Nodal Analysis example problem. Nodal Analysis is a method of circuit analysis where we basically just apply Kirchhoff's Current Law (KCL) at each node with an unknown voltage. You can choose to ground any of the nodes, but generally, grounding one with the most branches (especially if they are voltage sources) will make the problem easier. We will end up with one equation per unknown node voltage, and can just solve the system of linear equations to find the branch currents. This example problem features two voltage sources.
This video is part of a full free course on electric circuits. The course covers DC circuits, circuit laws, current & voltage sources, series & parallel resistors, nodal analysis, mesh analysis, and AC circuits.
Links to the course are here:
Website: www.engineer4free.com/circuits
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Thanks for watching, I hope it helps!

Пікірлер: 86

@Engineer4Free 3 жыл бұрын

Scroll up and hit that 👍 button if you found this video helpful! Full Circuit Analysis playlist is here: kzfaq.info/sun/PLOAuB8dR35ocf9Typ1iX9NRmX0V04UYfQ

@bexleynessia7114 Жыл бұрын

I hate long video tutorial and yours is just so brief and simple easy to understand and fast to learn a big topic in less then 10 minutes thank you for this so helpful

@isaacmwangi7038 Жыл бұрын

Thanks, though you have made a mistake at kcL B , because if you multiply -4(2-vB) You are supposed to get ( -8+4vB) So that you get =2vB-VA+vB-8+4vB If you solve further you get vA=7vB-8

@stacybatabe3843 Жыл бұрын

Thank God i wasn't mistaken

@siul2 7 ай бұрын

bro no wonder I was so confused

@spoon4974 9 ай бұрын

This one and the explanation made Nodal analysis so much more understandable

@md.abdullahalrafi6496 2 жыл бұрын

100x better than my university teacher.

@Engineer4Free 2 жыл бұрын

😁😁

@officialfayomi 11 ай бұрын

😂😂😂😂😂

@rs-debjit9350 8 ай бұрын

True brother❤

@user-vu1kg6nq4c 8 ай бұрын

exactly

@MDTuhinReza-qb1lc 8 ай бұрын

Yea 🫡

@antoni3071 8 ай бұрын

You do amazing job! I am going through the playlist and smashing like on every video, cuz you deserve some positive feedback for this work

@santucigod Жыл бұрын

Totally amazing. I really could understand thanks to you.

@sarathybhaskaran7957 Жыл бұрын

This guy made my day, and now i can teach my girlfriend! You get a subscription.

@IceBelly 2 жыл бұрын

Thanks for this video , my guy saving my assignment rn

@user-yg4fn3zy6s 4 ай бұрын

In NIGERIA, lecturers don't teach. They just give course outlines then ask you to go study yourself with brief explanations.

@user-wf6iq5se8p 9 ай бұрын

TQ for this sir..I am able to understand ur calsses easily

@umairawan658 4 ай бұрын

Much informative vid keep it up👍

@user-kj3nv4mr1s 2 ай бұрын

Life made simple thank you very much.. very simplified

@noelleemma3043 2 жыл бұрын

-6 *-Va is +6va

@jamaicagonzaga7887 2 жыл бұрын

Sir thank you so much, you saved my day....I already subscribed your channel....Thank you and God Bless

@Engineer4Free 2 жыл бұрын

You're welcome!! Thanks for watching =)

@wesleytissmah6516 4 ай бұрын

Thanks understood clearly ❤

@shizaalmas 2 жыл бұрын

Exellent .i visit a lot of channel bit your channel is best .you solve my confusion

@micahjessy4736 2 жыл бұрын

Thanks for this video

@electriccircuits19 2 жыл бұрын

*“We learn more by looking for the answer to a question and not finding it than we do from learning the answer itself.”*

@ChiefYOUtuber 2 жыл бұрын

7:02 For the second KCL you did an algebraic mistake. It is not +4 but -4

@rehanahmed4206 2 жыл бұрын

Yes you are correct 😂

@Bech285 2 жыл бұрын

True, although he didn't include it in his answer, as the correct amswer is Va=7Vb-8.

@charlottealfresco4517 Жыл бұрын

Oops 😬

@kennethkngoma1262 4 ай бұрын

Wow, Thank you so much

@tomitonaomy9666 Жыл бұрын

Wow 🎉 thanks so much

@mars8499 Жыл бұрын

Your voice is soothing

@siddharthpg2919 10 ай бұрын

thank you so much !!

@nusratnoor8440 Жыл бұрын

May God bless you 🙏❤ bro

@onyxtechnologyx Жыл бұрын

I love u so much dude

@nacht3894 8 ай бұрын

Thank you sir

@cosmos8366 2 жыл бұрын

I like how you used the fraction multiplied by 7 for less rounding issues

@atiqnajmi1163 2 ай бұрын

Nice video

@AlexTheTech 5 ай бұрын

5:05 Its supposed to be -18+6va, because negative times negative becomes a positive.

@almiaangelol.9059 2 жыл бұрын

Hi how to solve if the 2 ohm's is unknown? Hope you notice

@tormentor2285 2 жыл бұрын

love you man

@Engineer4Free 2 жыл бұрын

@mohammadhoseinrivandi5657 3 жыл бұрын

Hi,I have a problem and i can't solve it.Is there a way to send the problem so that you help me out?

@amandragon8919 6 ай бұрын

But how do you get KCL A -6 to -18 after simplify? may i know?

@merrysanjenbam603 3 жыл бұрын

Hi, I like your teaching but i have one doubt in this video. I want to know why i3 goes on right side? can't it go to left too? Please reply! much appreciated

@Engineer4Free 3 жыл бұрын

I just assumed a direction for i3, in this case it was to the right. When I drew it, it was an unknown, and I could have assumed either direction. If i3 ended up being a negative vale, then that would have told us that it was in fact pointing the other direction. However, in this example, we calculated i3 to be positive, so our assumed direction was correct.

@merrysanjenbam603 3 жыл бұрын

@@Engineer4Free Thanks a lot . Subscribed your channel. I hope your channel will help others a lot too Keep it up

@HardwareNinja 2 жыл бұрын

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@lagunacorona Жыл бұрын

Can you do one based on wheatstone bridge? also it seems from other comments on other videos that professors leave specific details out to "appreciate how to get the right answer" people don't have time to mess around.

@sereypanhanuth5788 Жыл бұрын

i absolutely hate professors like that.

@lagunacorona Жыл бұрын

I dont understand why i3 on one side is traveling in and is respresented as a positive ? and on the other set on node be as a negative ??? what is going on??

@kozuta8858 9 ай бұрын

what if the voltage source is flipped and negative sign is above?

@cosmos8366 2 жыл бұрын

In KCL - A you multiplied -6 by -va which you have as -6VA which should be +6VA . If it was -6VA you would not have 13VA but instead just have 1VA.. to get 13VA it has to be positive.

@bibitei8935 Жыл бұрын

Thanks i thought i was tripping

@cordelllitus2630 Жыл бұрын

distribute the negative first then it would be -3+VA

@ankitnigam4261 2 жыл бұрын

at kcl b the final equation is wrong

@user-vu1kg6nq4c 8 ай бұрын

How to know the currents are out or in in direction please reply me soon

@FatimaZohra-hn3vi 2 жыл бұрын

What if we have only one voltage source

@officialfayomi 11 ай бұрын

Am i the only one who noticed that he made a mistake in KCL B, while subtracting I5 from I4 and I3. He changed I5 sign from minus to plus.

@seth2039 2 жыл бұрын

huge

@Pragmatic80 Жыл бұрын

I'm boggled a little bit on 7:51 How is 2VB + VB - 4VB = 7VB Shouldn't it be -VB?

@zackify187 Жыл бұрын

VB counts as 1. Same as how X counts as 1.

@mightygod-bw3cn 2 жыл бұрын

4:11 how to you know what to multiple with like when u did with 12

@maliktalha9136 2 жыл бұрын

Through LCM

@Incomplete_artist 3 жыл бұрын

How we find common dinominator?

@augustussinclair1626 2 жыл бұрын

it's quite easy, actually! it's elementary level maths; basically you single out all the numbers on the bottoms of the fractions, line them up and start dividing with numbers in hopes of getting each number to a 1. for example, if you have 1, 2, 4 like in the Vb portion of the video - you ignore the 1 because it's already a one, so you have 2 and 4 left. both are divisible by 2, which - when divided - leaves you with a 1 and a 2. then you divide them again with a 2 and the end result is three ones, with two twos you used to divide them with. then you multiply the numbers you used while dividing (aka 2 and 2 here) with one another, and the end result is your common denominator (4 in this case). hope i was able to help!