Circuit Analysis: Node Analysis (Part 2 - Example)

http://www.FreedomUniversity.TV. A series of videos on circuit analysis with initial focus on DC. For questions, contact, Professor Santiago at john@e-liteworks.com or visit the above URL for other videos and technical topics.

Category:

Education

Tags:

• circuit analysis
• dc circuit analysis
• kirchoffs voltage law
• kirchoffs current law
• KVL
• KCL
• node analysis
• nodal analysis
• how to do nodal analysis
• how to do
• ohms law
• resistance
• conductance
• Chapter 3-1

[CharlieBurke]

Thanks a lot man you saved my life ! BTW you have like an email if I wanna ask you about an specific problem?

[riceboi911]

@syedhaniraza he said the incoming current is 0 because nothing is is going in. You can actually leave out the zero if you wanted. Just look at node A and specify if current is going out then it is negative and vice versa. Since it is give that io,i2 and i3 are leaving node A, he simply put -io-i2-i3=0. you put that equal to 0 because that is KCL's rules. You look at a node and identify which are leaving and entering and set it to 0.

[dralseth]

this is fantastic! do you fancy replacing my lecturer at university?

[halflife1994]

@ 2:24, how did you get G1 at the equation "R1= G1(VA-0)?

[syedhaniraza]

at node A how u said that incoming current is zero..??? u made me sick !!! how u write kcl at node A @drjctu

[xXxAlyssaLynaexXx]

@faizanstate Im not sure about that. Because at node B, one of the currents are leaving, but the other is entering. The only thing we are assuming is that leaving currents are negative, but you dont have to assume if a unknown current is leaving or entering a node because you can just look at the circuit and tell.

[xXxAlyssaLynaexXx]

@amirantenna Its not really an assumption or anything. When you look at the circuit you see that Io was going towards Is. (Is is going clockwise, Io is going counter-clockwise). And since we also see that Is and Io are equal, we can just say that Io is opposite (or negative) whatever the Is value is.

[faizanstate]

@lssam100

in nodal analysis we consider that every unkown current is a leaving current.....

[amirantenna]

Apart me DR. J but..

Why did You Assumed "Io" in the opposite direction of "Is"?

[lssam100]

you said all these currents coming out of a node !! a node is current generateor ?

l am really confused what a node is after the first second of this video.

[saudlive]

Thank U so much :)