Natural response and step response

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Discussion Overview

The discussion revolves around the concepts of natural response and step response in electrical circuits, specifically in the context of a circuit containing a current source in parallel with an inductor, resistor, and capacitor. Participants seek clarification on the definitions and distinctions between these two types of responses.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions whether a circuit with a current source in parallel with an inductor, resistor, and capacitor is considered a natural response or a step response, suggesting that a step response occurs when a switch is activated and a source is added.
  • Another participant expresses uncertainty about the definition of "natural response," proposing that it might refer to the steady-state behavior of the circuit, while affirming that a step response aligns with the described sudden changes in voltage or current.
  • A different participant asserts that the scenario does not fit neatly into either category, stating it is simply a circuit, but notes that if the current source includes a step, then a step response would occur, and if there are nonzero initial conditions, a natural response would be present.
  • One participant defines natural response as the behavior of a capacitor or inductor discharging over time until the voltage and currents approach zero, while describing step response as the process by which a source charges the inductors and capacitors, potentially leading to discharging if initial conditions are higher than the source's output.

Areas of Agreement / Disagreement

Participants exhibit varying interpretations of natural and step responses, with no consensus reached on the definitions or applicability of these concepts in the given circuit scenario.

Contextual Notes

Definitions of natural response and step response appear to depend on specific circuit conditions and initial states, which remain unresolved in the discussion.

2slowtogofast
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ok i need some clarification if you have a circuit where a current source is in parallel with an inductor a resistor and a capacitor is this considered a natural response or a step response. I guess i thought a step response is if a switch is switched and a source is added then it is a step response not if it was there the whole time.
 
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Not sure what a "natural response" is... Perhaps it means the steady-state behavior since "step response" is pretty much what you describe: how the circuit behaves when a sudden change in voltage or current is applied.
 
2slowtogofast said:
ok i need some clarification if you have a circuit where a current source is in parallel with an inductor a resistor and a capacitor is this considered a natural response or a step response.
Neither. It's just considered a circuit.

If the current source contains a step then there will be a step response. If there are nonzero initial conditions then there will be a natural response.
 
natural response means the a capacitor/inductor is discharging such that after a long time, the voltage and currents approaches 0

step response is when a source will try to charge the inductors capacitors such that after a long time, the capacitors/inductors connected will be charged. if the capacitors/inductors have high initial voltage/current than what the source has to offer they can discharge until it reaches a steady charged state with a lower voltage/current. please correct me, this is how i understand step and natural response
 

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