KCL Nodal Analysis & Power to Resistor (Need help)

Click For Summary

Discussion Overview

The discussion revolves around a homework problem related to Kirchhoff's Current Law (KCL) and nodal analysis, specifically focusing on the application of these concepts to analyze a circuit involving resistors and voltage sources. Participants are seeking clarification and assistance in solving the problem.

Discussion Character

  • Homework-related, Technical explanation, Debate/contested

Main Points Raised

  • One participant expresses uncertainty about their initial solution and requests help to continue with the problem.
  • Another participant identifies a potential issue in the original equations, noting that adding different units (voltage and current) indicates a mistake.
  • A subsequent reply reiterates the concern about unit inconsistency and questions whether the voltage at a specific node is equal to the voltage source, suggesting a need for clarification.
  • A further response counters this by stating that there is a resistor and a voltage source between the nodes, indicating that a 'supernode' approach may be necessary for nodal analysis.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the correct approach to the problem, as there are differing views on the relationship between the voltage at the node and the voltage source, as well as the necessity of using a supernode.

Contextual Notes

There are unresolved assumptions regarding the circuit configuration and the definitions of terms like 'supernode,' which may affect the analysis.

hdp12
Messages
67
Reaction score
2

Homework Statement


Here is the homework problem I was given:​
SS 2015-09-20 at 3.51.03 PM.png


The Attempt at a Solution


IMG_5338.JPG


Above is the work that I began, however, I have an overwhelming feeling that I am incorrect and also I don't know how to continue to the next part/parts. Would someone please help me?
Thank you
H
 
Physics news on Phys.org
I haven't checked each part, but I do see an issue: note that in your second equation, you've got a voltage plus a current. Any time you're adding different units, something has gone wrong.
 
Last edited:
axmls said:
I haven't checked each part, but I do see an issue: note that in your second equation, you' a got a voltage plus a current. Any time you're adding different units, something has gone wrong.
You're right, I can't do that..
Is the Voltage at the second node equal to the Voltage source, since there's nothing in between the Voltage source and the node?
 
hdp12 said:
You're right, I can't do that..
Is the Voltage at the second node equal to the Voltage source, since there's nothing in between the Voltage source and the node?
no. there is a resistor AND a voltage source in between the two nodes. If you want to do nodal anlysis you'll need to use a 'supernode'
 

Similar threads

Engineering Why Is Nodal Analysis Confusing in This Circuit Example?
  • · Replies 7 ·
Replies
7
Views
2K
Engineering Why is the voltage source high potential into node 1 at -12 V in this op amp problem?
  • · Replies 15 ·
Replies
15
Views
3K
Engineering Solving a Circuit with Nodal Analysis
  • · Replies 6 ·
Replies
6
Views
2K
Engineering Solve this Circuit using both Nodal Analysis and Mesh Analysis
  • · Replies 15 ·
Replies
15
Views
4K
Solving Voltage Source Nodal Analysis: Find Vo
  • · Replies 3 ·
Replies
3
Views
2K
Find V1 & V2 with Nodal Voltage Analysis
  • · Replies 1 ·
Replies
1
Views
2K
How Does Nodal Analysis Determine Currents in a Circuit with Multiple Resistors?
  • · Replies 3 ·
Replies
3
Views
2K
Engineering Thevenin's equvalent circuit of the network?
  • · Replies 2 ·
Replies
2
Views
2K
Use KCL and KVL to find the power supplied by the two ideal sources
  • · Replies 2 ·
Replies
2
Views
3K
Nodal Analysis with Dependent Voltage Source
  • · Replies 9 ·
Replies
9
Views
6K