The RC Circuit calculation in the hosted text book may have the units wrong.

Discussion in 'Electronics Resources' started by Eric Chipko, Jun 19, 2015.

  1. Eric Chipko

    Thread Starter New Member

    Jun 2, 2015
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  2. Eric Chipko

    Thread Starter New Member

    Jun 2, 2015
    2
    0
    On closer look it may be trying to describe two different components and that when summed, they equal the source voltage.
     
  3. WBahn

    Moderator

    Mar 31, 2012
    17,715
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    The first answer is not 1.4989 mA, but -1.4989 mA. They even make a specific point about it being negative.

    This is the amount that the current has changed by relative to the starting current of 1.5 mA in the first 7.5 seconds. So the actual current at t=7.5 seconds is the sum of the two, which leaves you with about 1.1 uA.

    I'm not a big fan of their approach, but I do have to give them kudos for, mostly, tracking their units throughout the work. That is pretty rare.
     
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