Voltage and current calculations

Discussion in 'Feedback and Suggestions' started by Unregistered, Apr 27, 2010.

  1. Unregistered

    Thread Starter Guest

    http://www.allaboutcircuits.com/vol_1/chpt_16/4.html
    About midway down the page reads, "Since we started at a capacitor voltage of 0 volts, this increase of 14.989 volts means that we have 14.989 volts after 7.25 seconds."
    This should be"...increase of .989 volts..."
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,535
    A RC time constant of 1 second, and a capacitor reaches 99% of it's charge in 5TC, I think you can see where your logic is in error.

    In this case the capacitor reaches 0.99929 of its value in 7.25 TC, but remember, this is not the percentage, the percentage is 99.929% of the total charge of 15V.

    If you would like to continue this conversation please register, and post in the other forums. It is easy to do.
     
  3. Unregistered

    Thread Starter Guest

    You're right, i read it wrong and didn't check it before posting. sorry bout that.
     
  4. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    312
    Have you checked the rest of the book, or forum?

    If this is an interest, you could add to the membership. Thought of registering?


    Its only 799.95. But this era only we are offering a 799.95 off instant rebate.

    ;)
     
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