Help with Circuits Analysis: V oc & Current Source

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Discussion Overview

The discussion revolves around circuit analysis, specifically focusing on the concepts of open-circuit voltage (Voc) and Thevenin equivalent circuits. Participants are examining a partial circuit diagram to clarify the relationships between components and their contributions to the overall circuit analysis.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant questions whether Voc is equal to the voltage across the current source.
  • Another participant notes that the resistor in the circuit has no current and thus no voltage drop in its current state, but this may change when the circuit is fully connected.
  • A participant clarifies that the problem involves finding the Thevenin equivalent and asks if the resistor to the right of the current source should be included in the calculations, given the assumption of an open circuit situation.
  • One participant acknowledges a previous misunderstanding about Voc and confirms it is indeed the same as the voltage across the current source, while also stating that the resistor should be included in the Thevenin resistance calculation.

Areas of Agreement / Disagreement

There is some agreement on the relationship between Voc and the voltage across the current source. However, there remains uncertainty regarding the inclusion of the resistor in the calculations, indicating that multiple views exist on this aspect of the problem.

Contextual Notes

The discussion does not resolve the assumptions regarding the circuit's configuration or the implications of treating the resistor as part of the Thevenin equivalent, leaving these aspects open to interpretation.

jojoba
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I am new to circuits analysis; just wanted to confirm I am doing this problem right:

The partial circuit is attached to this post.

Is V oc equal to the voltage across the current source?
 

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yeah, but as drawn, that resistor has no current, and thus no voltage drop. once it stops being a partial circuit and is attached to other things, then that will change.
 
I guess I should have made it more clear. This is a problem in which we are supposed to find the Thevenin equivalent. I had omitted redrawing the circuit on the farthest left of the diagram ( which is shown by dotted lines). The farthest right of the circuit (where Voc is shown) is supposed to be V Th. Do I still need to count the resistor to the right of the current source in my calculation? I thought there is no current floeing through that resistor since it is an open circuit situation?
 
You're right about Voc, sorry for the misinformation. Voc is the same as the voltage across the current source. The resistor does need to be counted in the Rth calculation, though. I deleted my previous post so I wouldn't confuse anyone else. Thanks for straightening me out Proton Soup. :biggrin:
 

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