Thevenin equivalent q. (AC analysis)

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Discussion Overview

The discussion revolves around finding the Thevenin equivalent circuit for a given AC circuit, focusing on the calculation of open circuit voltage (Voc) and the role of various components, including resistors and inductors. Participants explore the implications of removing load components and the current distribution in the circuit.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant proposes combining impedances in parallel and then adding a series resistor to find Voc, questioning whether the 10 Ohm resistor is relevant in this calculation.
  • Another participant asserts that the 9.6+j2 Ohm load must be removed to calculate the open circuit voltage and discusses the voltage division between the 10 Ohm resistor and other components.
  • A participant expresses confusion about the current through the 10 Ohm resistor when calculating Voc, suggesting that it might be zero due to the configuration of the circuit.
  • Another participant counters this by stating that there is indeed current through the 100k resistor and the j50 inductor, implying that the 10 Ohm resistor is not without current.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the role of the 10 Ohm resistor in the calculation of Voc, with differing views on whether it carries current during the analysis.

Contextual Notes

There are unresolved assumptions regarding the circuit configuration and the impact of removing load components on the analysis of Voc. The discussion reflects varying interpretations of circuit behavior in the context of Thevenin's theorem.

Who May Find This Useful

Students and practitioners interested in circuit analysis, particularly those studying Thevenin's theorem and AC circuits.

eeuler
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Homework Statement


r94jgi.jpg


^We're asked to find the "Thevenin's equivalent circuit for the source"

The Attempt at a Solution


I'm a bit unsure how to start this problem. What i initially thought was that i'd combine all my impedances in parallel to the point where it's them combined plus the 10ohm resistor in series, then use the voltage divider..however the part of the circuit labeled as 'load', well am i suposed to find the voltage across the inductor and resistor in series (9.6+j2ohms), as in, is that where my Voc is? And thus the 10ohm resistor is useless in calculating the Thevenin voltage (since the current entering it would be zero)?

Is that how i should approach it? Consider Voc to be where the resistor and inductor are? I don't think i explained myself properly, but this is what i mean:
vfui5u.jpg


Just that in other (similar) problems I've done, they either have just the open circuit nodes a and b (with the rest of the circuit being to the left) or they have an arbitrary load impedance (ZL) connected to a and b nodes (with no value). So am i to find the open circuit voltage between terminals a and b (including the resistor and inductor in series)?
 
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The 9.6+j2 Ohm load must be taken off the circuit in order to calculate the open circuit voltage. The voltage is divided between the 10 Ohm resistor and the parallel of 100k and j50 Ohm.
Why do you say that there is no current through the 10 Ohm resistor?
 
^^Thanks for the reply, but i figured it out :)

I thought that there'd be no current through the 10ohm resistor, because when you're calculating the Voc, the component on the horizontal branch that leads to one of the open terminals, well isn't the current through that branch zero..?
 
eeuler said:
^^Thanks for the reply, but i figured it out :)

I thought that there'd be no current through the 10ohm resistor, because when you're calculating the Voc, the component on the horizontal branch that leads to one of the open terminals, well isn't the current through that branch zero..?

No, because there is current through the 100k resistor and the j50 inductor.
 

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