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Math Help - Electronics - Calculating charge

  1. #1
    Member
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    Nov 2011
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    Talking Electronics - Calculating charge

    Hi everyone!

    So here is my question:

    The currents of the terminals in the terminals of the element in Fig. 1.5 (I attached a picture) is:

    i = o, t < 0
    i = 20 e -5000 t ≥ 0

    Calculate the total charge (in microcoulombs) entering the elemnet at its upper terminal.

    I am a bit confused because I know the forumla i = dq/dt, but I am not given any "t" here.

    Can anyone help? Thank you very much!
    Attached Thumbnails Attached Thumbnails Electronics - Calculating charge-current-1.jpg  
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  2. #2
    MHF Contributor
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    Re: Electronics - Calculating charge

    Hey Nora314.

    Is your equation meant to be i = 20*e^(-5000t)?

    If so you probably want to find q(t) by integrating over the appropriate region of time.
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