What Went Wrong with My Laplace Circuit Problem?

  • Thread starter Thread starter NewtonianAlch
  • Start date Start date
  • Tags Tags
    Application Laplace
Join the discussion
Registration is free. Ask a follow-up in this thread, or start your own.
2 replies · 2K views
NewtonianAlch
Messages
453
Reaction score
0

Homework Statement


http://img836.imageshack.us/img836/9994/27794040.jpg

The Attempt at a Solution



Here is the circuit I re-drew:
http://img403.imageshack.us/img403/6752/dsc0048ga.jpg

Working out:

http://img857.imageshack.us/img857/5633/dsc0049mo.jpg

I got the denominator correct, but my numerator isn't. Which means I got something wrong with the sources in the circuit, but I'm not sure where.
 
Last edited by a moderator:
Physics news on Phys.org
It's hard to read your paper. I can only offer you what I do in cases like this where initial conditions exist:

1. Change the Laplace equations to differential equations, ignoring the initial conditions.

2. Change the differential equations back to Laplace domain, using the Laplace transform rules for including initial conditions, e.g.
if F(s) = L{f(t)} then L{f'(t)} = sF(s) - f(0+) etc.

3. Then do the inverse transforms term-by-term.

This is probably equivalent to what you're trying to do, I can't tell.