RL circuit natural response

  • Thread starter csmix
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  • #1
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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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  • #2
berkeman
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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?
 
  • #3
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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.
 
  • #4
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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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