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Homework Help: Energy in an inductor

  1. May 2, 2010 #1
    1. The problem statement, all variables and given/known data
    the current through an element is i = 2t^2 - 1 Amps. if that element is a 4H inductor, what is the energy delivered to it from time t=1 to t=3.

    2. Relevant equations
    energy in an inductor is dw = Li di

    3. The attempt at a solution
    i = 2t^2 - 1
    di = 4t dt
    w = L integral[ (2t^2 - 1)(4t) dt ] from 1 to 3 seconds

    i just want to confirm it with someone if i did it right or not. i felt like i did. thanks.
  2. jcsd
  3. May 2, 2010 #2


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    Homework Helper

    yeah, that's right
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