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This is an easy problem that I don't know why I'm having trouble with it

  1. Apr 13, 2009 #1
    1. The problem statement, all variables and given/known data
    So I've been doing some hw and I came to a problem that I'm not getting. I know it's simple math but what am I forgetting? The question is:
    (R + sL)(1/sC)

    What I did is:
    (R/sC)+(sL/sC)= (R+sL)/sC= (R+L)/C=?

    But the answer is (1/C)(s + R/L). So what did I do wrong and could you show me step by step on how to get that answer?
     
  2. jcsd
  3. Apr 13, 2009 #2
    You can't factor out the s like that, there is no sR term, so you shouldn't be getting (R+sL)/sC= (R+L)/C

    edit: But yes, you really should check you typed the answer/problem correctly...
     
    Last edited: Apr 14, 2009
  4. Apr 13, 2009 #3
    [tex]\frac{1}{sC}\left(R + sL\right)=\frac{R}{sC}+\frac{sL}{sC}=\frac{R}{sC}+\frac{L}{C}=\frac{1}{C}\left(\frac{R}{s}+L\right)[/tex]

    You need to cancel things with every term when you're simplifying fractions. And are you sure you typed the answer correctly?
     
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