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Current formula question

  1. May 4, 2008 #1
    I know I(t) = Io [1 - e-t/t ] is the formula to calculate the current in an RL circuit, however i have no clue what "e" stands for. Can someone give me an insight?
  2. jcsd
  3. May 4, 2008 #2


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    e is the exponential function: here, it means [itex]\mathrm{exp}(-t/\tau)[/itex], where [itex]t[/itex] is time and [itex]\tau[/itex] is a characteristic time constant.
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