Finding Initial Current and Natural Response in an RL Circuit

AI Thread Summary
The discussion revolves around solving an RL circuit problem, specifically finding the initial current through an inductor and understanding the role of a dependent source. Participants clarify that the diamond-shaped component is identified as a current controlled voltage source. The original poster (OP) indicates they have resolved their issue, noting that at t=0-, the inductor acts as a short circuit, allowing the initial current to be determined through a resistor. For t >= 0, the natural response of the inductor's current requires calculating the equivalent resistance using Thevenin's theorem. The conversation emphasizes the importance of showing work and understanding circuit analysis principles.
csmix
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Can anyone please help me slove this example circuit i found.
im having a hard time finding the initial current through the inductor and duno how to deal with the dependent source and inductor after the switch is opened.
 

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What's the diamond shaped thing? Is that a current controlled voltage source or a current controlled current source?

What equations have you been able to set up so far? Is this a homework problem?
 
berkeman said:
What's the diamond shaped thing? Is that a current controlled voltage source or a current controlled current source?

What equations have you been able to set up so far? Is this a homework problem?

Looks like a current controlled voltage source.

To the OP -- you're going to have to show some work, like berkeman said.
 
thanks for feed back but i have figured it out. If anyone else needs help with this circuit i'll get u guys started. to find initial current at t=0- the inductor is a short circuit so Io is just the current through the 4.5Ohm resistor.

After the switch is closed to find iL(t) for t >=0 you will need to use the natural response equation for the current of an inductor which means u will need to find Req for tao. to find Req u need to thevenize the circuit by creating an open circuit at the inductor and finding Voc=Vth then the R in the standard form would be Vth/Itotal.
 

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