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Laplace transform

  • Thread starter ranju
  • Start date
  • #1
223
3

Homework Statement


we have to solve the given circuit using laplace transform for i(t) for t>0 when switch k opened at t=0..
now all I wnated to make clear is the final circuit diagram of this in s-domain..[/B]


Homework Equations




The Attempt at a Solution


as I solved I considered the circuit to be in steady state before switch is opened so , current across inductor is 6A...[/B]
 

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Answers and Replies

  • #2
176
7
Images are not clear.
 
  • #3
176
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What is i(0+) you are getting ?
 
  • #4
223
3
well only the left hand portion is'nt clear.. in 1st pic.. there is 12V voltage source & in 2nd pic it is 12/s in s-domain..
i(0+)=i(0-) = 6A..
 
  • #5
176
7
can you show your working for i(0-).
 
  • #6
223
3
sorry actually I did a calculation mistake..i(0-) =4 A.. and I found the equivalent current of the circuit considering it in steady state before switch is opened.. so the inductor is dhorted so the whole 4 A current pass across the inductor branch..!!
 
  • #7
176
7
Are you sure the current will be 4 A,mine is coming 14 A.
 
  • #8
223
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you are right ..:rolleyes: ..
 
  • #9
176
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Your second image is correct.
 
  • #10
223
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thanks and additional thanks for correcting that mistake.. :p
 
  • #11
176
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You are welcome.
 

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