Finding Initial Current and Natural Response in an RL Circuit

[csmix]

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.

 

[berkeman]

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?

 

[Maxwell]

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.

 

[csmix]

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.