Impedance in an electric Circuit

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Homework Help Overview

The discussion revolves around the concept of impedance in an electric circuit, specifically focusing on a scenario where only resistors are present. Participants are exploring whether impedance can be applied in this context and how it relates to DC circuit analysis.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning the applicability of impedance when only resistors are involved, with some suggesting that it could be treated as simple resistance. Others are exploring the relationship between impedance and DC circuit behavior.

Discussion Status

There is an ongoing exploration of whether the circuit can be analyzed like a DC circuit, with some participants affirming that it can be treated as such due to the absence of frequency dependence when only resistors are present. However, there is no explicit consensus on the broader implications of impedance in this context.

Contextual Notes

Participants are grappling with the definitions and applications of impedance, particularly in circuits lacking inductors and capacitors. The discussion reflects a mix of understanding and uncertainty regarding the treatment of resistive circuits in relation to impedance.

wheybags
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Homework Statement



O1IIO.png


Homework Equations



V=IR ?

The Attempt at a Solution



My main problem with this question is that impedance seems to apply only when inductors and capacitors are involved, but this circuit includes only resistors, so it seems to me like I could just treat it as resistance in this case.
Any help would be appreciated. Thanks,
wheybags.
 
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wheybags said:

Homework Statement



O1IIO.png


Homework Equations



V=IR ?

The Attempt at a Solution



My main problem with this question is that impedance seems to apply only when inductors and capacitors are involved, but this circuit includes only resistors, so it seems to me like I could just treat it as resistance in this case.
Any help would be appreciated. Thanks,
wheybags.

Yes, all of the impedances in this circuit are resistances.
 
Does that mean I can just treat it exactly like I would a DC circuit?
 
wheybags said:
Does that mean I can just treat it exactly like I would a DC circuit?

Yes. The AC voltage sources are shorted out for this analysis, just as you would do for a DC source.
 
My main problem with this question is that impedance seems to apply only when inductors and capacitors are involved,

No, impedance applies as well with R L and C involved.
In a circuit with only resistors, all impadances are real (there's no imaginary part).
 
Quinzio said:
No, impedance applies as well with R L and C involved.
In a circuit with only resistors, all impadances are real (there's no imaginary part).

But can I still treat it like a DC circuit?
 
wheybags said:
But can I still treat it like a DC circuit?

Yes. When it is all resistors, there is no frequency dependence.
 

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