☑️13 - Nodal Analysis involving Voltage Sources (Supernode) 1

[@lindsaygillette2320]

Thank you so much!!! You made this so easy and accessible. I've been reading and searching videos for quite some time. Your video instantly clicked and now I can finally go to bed!

[@SkanCityAcademy_SirJohn]

Aww great, thanks

[@emmanuelacheampong9659]

God bless you very much You really improved my capacity of understanding 👏👏👏

[@SkanCityAcademy_SirJohn]

Thanks for watching too

[@bartukacar5629]

I finally understood supernodes, thank you so much

[@SkanCityAcademy_SirJohn]

You are most welcome. Please where do you watch from?

[@bartukacar5629]

Turkey@@SkanCityAcademy_SirJohn

[@pixy547]

Can i use nodal on a circuit that's already been solved using supermesh?

[@SkanCityAcademy_SirJohn]

Yes you can

[@BalajiKumar-e2v]

What can we do sir if that 10ohm resistor is in series with the 2v source?

[@okzzvil7617]

We have to demand corrections on books and ideas. In real world, there is no such thing as current source without voltage source. A circuit showing only a current source is fake idea. Where can you find a current source? This idea is meant to confuse students.

[@SkanCityAcademy_SirJohn]

😂😂

[@robertbatista50]

He has a point. I have this in my own notes concerning current sources. I think it would be safe to say that inherent within the symbol of the current source there is a Voltage. Since Voltage is a requirement for all circuits, including current sources, current source is just a specialized application of a Voltage source. 😅, did I confuse you more 😂

[@SkanCityAcademy_SirJohn]

Interesting ideas, I love it. Thanks so much for your contribution. I'm grateful.

[@aniabia5875]

Lovely explanations. Thanks a million. Pls which textbook can you recommend for this?

[@SkanCityAcademy_SirJohn]

You are most welcome. Alexander and Sadiku - fundamentals of electric circuit

[@Whowhywhere23]

Thank you

[@SkanCityAcademy_SirJohn]

Most welcome

[@oladimejioluwakayomide4045]

Thanks so much bro♥️♥️

[@SkanCityAcademy_SirJohn]

Most welcome

[@Ogamunesunday]

Many thanks for your Videos. Do you have the Nodal Analysis involving Voltage Sources (Supernode) 2?

[@SkanCityAcademy_SirJohn]

I think I should have, please check the playlist...

[@Ogamunesunday]

​ @SkanCityAcademy_SirJohn I did already but it's not available. You can share me the link in case I'm missing something. Thanks.

[@SkanCityAcademy_SirJohn]

I think I don't have

[@mohamedsillah9885]

Sir please help us with that explanation in another video. Nodal Analysis involving Voltage Sources (Super Node)2.

[@SkanCityAcademy_SirJohn]

@mohamedsillah9885 noted

[@zaidabdulkarim2125]

Please sir, at 9:10 i don't understand why did we take v2 to be negative? and do we always consider at 8:37 that there will be positive up and negative down?

[@SkanCityAcademy_SirJohn]

At 9:10 Ideally the current is supposed to flow from the positive terminal at V2. But since we take 2v as reference voltage and we take the clockwise direction, V2 will move opposite to 2v hence V2 will be negative. At 8:37 Yes, negative is to ground.

[@michaelasilidjoe4862]

Please sir For the first eg. Can there be a case where the 2A is directed downwards or the 7A is directed upwards. If yes ,how are you gonna solve it

[@SkanCityAcademy_SirJohn]

Yes, the difference is where you apply kcl and the node. If one quantity is entering the node and was positive, if the direction changes, it will be leaving the node and this time negative

[@michaelasilidjoe4862]

@@SkanCityAcademy_SirJohn .....Thank you very much.... May God bless you

[@SkanCityAcademy_SirJohn]

Amen, may God bless you too

[@timdavid5638]

Nice class

[@SkanCityAcademy_SirJohn]

Thank you so much

[@Shinzotech23]

How can u remove 10 ohm in 1st question

[@SkanCityAcademy_SirJohn]

Because a supernode is formed at that node

[@prejoleswilvenjayb.6821]

can you solve the v and i in 11:54

[@SkanCityAcademy_SirJohn]

That's exactly what I solved in the video.

[@GregMaquiling]

hi, can I know what is your reference book?

[@SkanCityAcademy_SirJohn]

Fundamentals of electrical circuits Alexander and Sadiku

[@piusoblie2013]

Please in Example 1 why did you ignore the 10ohm resistor that was parallel to the 2V source?

[@SkanCityAcademy_SirJohn]

I think I explained the concept of super nodes there. Do you understand that concept?

[@piusoblie2013]

@@SkanCityAcademy_SirJohn ohk. Thank you. I got the answer now. Love your teaching

[@SkanCityAcademy_SirJohn]

Pius Oblie you are most welcome. Where do you watch from?

[@piusoblie2013]

@@SkanCityAcademy_SirJohn Ghana. University of Ghana, Legon.

[@SkanCityAcademy_SirJohn]

Pius Oblie oh okay, thats nice. Good luck

[@joshuabalena2093]

in the fist problem where did the 10 ohms go?

[@SkanCityAcademy_SirJohn]

When a voltage source is found between two node reference nodes, a supernode is formed. In this case, the element in parallel with the voltage source goes away.

[@razan890]

What textbook you use ?

[@SkanCityAcademy_SirJohn]

Alexander and Sadiku fundamentals of electric circuit

[@ntwisisochauke3495]

Sir, for the second one are the answers not supposed to be v2= -6 and v1=-15?

[@SkanCityAcademy_SirJohn]

No please

[@ntwisisochauke3495]

Then i’m a big confused cause I don’t see where I went wrong😭

[@SkanCityAcademy_SirJohn]

kindly follow my solution carefully@@ntwisisochauke3495

[@oliveamichael1497]

I really did not understand the part were you summed the voltages. Like the sign conversion pls help sir.

[@SkanCityAcademy_SirJohn]

can you please state the time in the video so i help you out?

[@oliveamichael1497]

9:11s

[@SkanCityAcademy_SirJohn]

We assume conventional flow of current which says that current leave the positive terminal of a voltage source, an thats a positive current. Reference source is the 2v. We take the clockwise direction, going round the loop, our reference current opposes that of v2 hence that becomes negative and that of v1 is in line with the direction we took, ie. Clockwise, hence v1 becomes positive.

[@oliveamichael1497]

@SkanCityAcademy_SirJohn thank you so much sir. God bless you ❤️

[@SkanCityAcademy_SirJohn]

You are most welcome. Where do you watch me from?

[@Erickmiregu]

Reason for excluding 10ohm

[@SkanCityAcademy_SirJohn]

Since there is a voltage source in between the two non-referenced nodes, a supernode is formed, hence a supernode is formed and the element in parallel with the said voltage source goes away.

[@BalajiKumar-e2v]

One question. What if the 10ohm is series with the 2v source.

[@TheVideotubo]

The current should be 4.2A

[@SkanCityAcademy_SirJohn]

That is correct