LR circuit in parallel, need someone to check answer

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Homework Help Overview

The discussion revolves around an LR circuit with a perfect inductor and resistors in parallel and series. The original poster seeks to determine the currents i1 and i2 at t=0 and as time approaches infinity after a switch is activated at t=0.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the behavior of the circuit at t=0 and t=∞, questioning the treatment of the inductor and the configuration of resistors. There are attempts to clarify the implications of the inductor's presence and the initial conditions of the circuit.

Discussion Status

The conversation is ongoing, with participants providing insights into the transient behavior of the inductor and its effect on current division in the circuit. Some guidance has been offered regarding the analysis of the circuit without the inductor for short-term behavior, while others express confusion about the implications of the inductor's role.

Contextual Notes

There is a noted lack of clarity regarding the initial conditions of the switch and the circuit's configuration, which has led to varying interpretations of the problem. Participants are encouraged to consider the inductor's behavior and the circuit's response over time.

  • #31
what is Thevenin equivalent emf?
 
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  • #32
2nafish117 said:
what is Thevenin equivalent emf?
Back in post #18 , gneill posted the following.

gneill said:
That's where Thevenin's Theorem comes in. You should have covered Thevenin and Norton equivalent circuits in circuit analysis prior to the introduction of inductor and capacitor components.

You want to remove the inductor from the circuit and replace the remaining voltage source and resistor network with a Thevenin equivalent circuit. It will consist of a voltage source and a single resistor. Those are your "E~" and "R~". Then when the inductor is re-inserted you have a simple series RL circuit to analyze.

Here is a link to the Wikipedia entry for Thevenin's[/PLAIN] Theorem .
 
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