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Homework Help: Laplace Transform for a circuit

  1. Apr 14, 2010 #1
    1. The problem statement, all variables and given/known data
    It's been a while since I've done laplace transforms, but I need some help with one!
    I am supposed to find the laplace tranform for the following signal. This is for my circuits class btw.

    xa(t) = 2u(t-1)

    2. Relevant equations

    Laplace tables. http://tutorial.math.lamar.edu/Classes/DE/Laplace_Table.aspx

    3. The attempt at a solution
    I am guessing that the u(t-a) part is a unit step function correct? From there, I am not exactly sure how to go. I don't see any transforms that fit exactly.
  2. jcsd
  3. Apr 14, 2010 #2


    Staff: Mentor

    #25 is u(t - c). Yes, this is a unit step function.

    And L{kf(t)} = kL{f(t)} because of the linearity of the Laplace transform.
  4. Apr 14, 2010 #3
    Thanks for the reply mark!
    So using 25, I would have 2*e-s/s ?

  5. Apr 15, 2010 #4


    Staff: Mentor

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