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Homework Help: DC behavior of an inductor

  1. Oct 20, 2008 #1

    Assume that resistor R has a resistance of 34.2 Ω, inductor L has an inductance of 152 mH (milli-Henry), and the battery has a voltage of 33.7 V. Also assume that the circuit elements are ideal.

    If the switch S is closed suddenly, the time for the current to attain a value of 82.1 mA is...

    2. Relevant equations


    3. The attempt at a solution

    I need help finding I_max.

    82.1 mA=I_max(1-e^(-t/(152/34.2)))

    Why do they give me V?
  2. jcsd
  3. Oct 21, 2008 #2


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    Homework Helper

    Hi strawberrysk8,

    I_max is the current in the circuit after the current has stoped changing (reached its final value). At that point, the inductor is not affecting the circuit (has no voltage drop across it). So how can you find I_max?