Circuit Analysis: Current flowing from negative to positive?

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SUMMARY

The discussion centers on Kirchhoff's Current Law (KCL) and the correct representation of current flow in circuit analysis. Specifically, the user questions why the current flowing away from Node C is denoted as V2(t) instead of -V2(t). The consensus is that current direction is determined by the reference polarity in the circuit diagram, and if the polarity is reversed, the sign of the current must also be adjusted accordingly. This clarification is essential for accurate KCL equation formulation.

PREREQUISITES
  • Understanding of Kirchhoff's Current Law (KCL)
  • Familiarity with circuit diagrams and polarity conventions
  • Basic knowledge of electrical current flow and voltage
  • Experience with writing circuit equations
NEXT STEPS
  • Study the principles of Kirchhoff's Laws in detail
  • Learn how to analyze circuit diagrams with varying polarities
  • Practice writing KCL equations for different circuit configurations
  • Explore simulation tools like LTspice for circuit analysis
USEFUL FOR

Electrical engineering students, circuit designers, and anyone involved in circuit analysis and KCL applications will benefit from this discussion.

t_jorgic
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Homework Statement



http://images.4chan.org/sci/src/1340320682704.jpg

I am to write KCL equations for this circuit. Why is it that the current flowing AWAY from Node C is written as V2(t). I thought that when a current was flowing AWAY from a node, the current would be -V2(t)??

Homework Equations





The Attempt at a Solution



My guess is this.

Normally a current flows from + to -. If this is true then:
> Current is negative when flowing away from a node and positive when flowing toward a node.

Unless the polarity is switched (like it is in the circuit diagram in which case, the sign if the current is switched? But i don't know if this is true or not. can anyone confirm or deny this?
 
Last edited by a moderator:
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It would be helpful if you would show the circuit you are talking about.

Just listing an entire website is not helpful
 

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