Need help finding node equations

[elec_eng]

Need help finding node equations!

[url=http://www.0zz0.com][PLAIN]http://www11.0zz0.com/2012/02/22/06/267083816.jpg[/url][/PLAIN]

I need to find the node equations for node voltages 1 and 3 to find voltages V1 and V3 leaving R3 as a variable!

hope to get help soon!

 

[tiny-tim]

welcome to pf!

hi elec_eng! welcome to pf!

show us what you've tried, and where you're stuck, and then we'll know how to help!

(btw, please don't post such wide pictures!)

 

[elec_eng]

This is what i tried!
(v1-v4)/R1+ (v1-v3)/R4=0
(v3-v2)/R4+ (v3-v1)/R3+ (v3-v4)/R5= 0

 

[gneill]

This is what i tried!
(v1-v4)/R1+ (v1-v3)/R4=0
(v3-v2)/R4+ (v3-v1)/R3+ (v3-v4)/R5= 0

Those equations don't appear to match the circuit. Perhaps you're not correctly identifying everything that comprises the individual nodes? Presumably the first equation is supposed to pertain to NODE 1? If so, what path does the second term describe? Where is the path from NODE 1 to NODE 2?

If the second equation pertains to NODE 3, then the last term is incorrect; it describes a path from NODE 3 to NODE 4 via resistor R5, but this path doesn't exist. Resistor R5 terminates at NODE 0 (Ground).

 

[DeeNos]

I would recommend consulting a textbook or online resources on circuit analysis and node equations. These resources can provide step-by-step instructions on how to find node equations and solve for unknown voltages. Additionally, seeking assistance from a tutor or professor in the field of electrical engineering may also be beneficial in understanding and solving this problem. It is important to have a strong understanding of circuit analysis techniques in order to accurately solve for node voltages and effectively troubleshoot any issues in a circuit. Good luck with your problem!