Which way is the current flowing?

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SUMMARY

The discussion focuses on analyzing current flow in a circuit involving a 5V source and nodal equations. The user identifies errors in their nodal equations, particularly in the treatment of current entering and leaving node v_2. They highlight discrepancies in the provided solution, specifically regarding the conversion of units from kOhm to Ohm and mA to A. The correct formulation of the equations is crucial for accurate analysis of the circuit's behavior.

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  • Understanding of nodal analysis in electrical circuits
  • Familiarity with Ohm's Law and current flow principles
  • Knowledge of unit conversions, specifically between kOhm and Ohm, and mA and A
  • Basic circuit theory, including voltage sources and resistors
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  • Review nodal analysis techniques for circuit analysis
  • Study Ohm's Law applications in complex circuits
  • Learn about unit conversions in electrical engineering
  • Explore common errors in circuit analysis and how to avoid them
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Electrical engineering students, circuit designers, and anyone involved in analyzing or troubleshooting electrical circuits.

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http://img184.imageshack.us/img184/2218/thisoneuf5.th.jpg

I'm having real difficulty picturing how the current is flowing in this circuit with the given solution.

From the 5v source into node v_2 is the current flowing from left to
right into this node?

These are the nodal equations that I would use to solve this problem, however they are wrong. Why?

At node two I would have the current flowing from left to right from the source into this node. I would have the 6mA flowing into this node. Finally I would have a current flowing out of this node from left to right. So I have 2 currents entering this node and one leaving

\frac{V_2-5}{200} + 6mA = \frac{V_0-V_2}{6000}


at node two

\frac{V_0-V_2}{6000} = \frac{V_0-(-6)}{3000}
 
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I agree with your equations

is it just your final result that is wrong? because if so, it's probably that (v2-5)/200 instead of (v2-5)/2000

oh and you converted kOhm to Ohm but didn't convert mA to A
 
Last edited:
if you are considering your equations to be wrong based on the solution that is provided...i believe there is an error in the solution provided

for the node in between r2 and r3, the solution provided said that the current coming into that node was (vo-v2)/r2 but for the previous node, that same current was expressed as (v2-vo)/r2
 

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