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How many volts will be across the capacitor at the second time constant?

Discussion in 'Electronics Homework Help' started by charmcaster.engg, Jan 28, 2015.

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  1. charmcaster.engg

    charmcaster.engg

    79
    1
    Mar 20, 2014
    An 8 V power source is charging a capacitor. How many volts will be across the capacitor at the second time constant?
     
  2. Gryd3

    Gryd3

    4,098
    875
    Jun 25, 2014
    What is your attempted answer so far?
     
  3. LvW

    LvW

    604
    146
    Apr 12, 2014
    What is the first time constant? How do you define it for this task?
     
  4. davenn

    davenn Moderator

    13,674
    1,892
    Sep 5, 2009
    As usual this OP has given very little info and made no attempt at an answer

    Please... no one else answer to the OP is forthcoming


    Dave
     
  5. charmcaster.engg

    charmcaster.engg

    79
    1
    Mar 20, 2014
    I google n get, after the first interval, the capacitor voltage equals 63.2% of the battery voltage. In the second time interval, the capacitor picks up 63.2%, not of the full of battery voltage, but 63.2% of the of the difference between the starting charge(5.056) and the battery voltage(8V). I am on right track to solve the question?
     
  6. Gryd3

    Gryd3

    4,098
    875
    Jun 25, 2014
    You sure are ;)
    Good job.

    Of course, now that you know the magic numbers, you can play with the math to make it easier ;)
     
  7. charmcaster.engg

    charmcaster.engg

    79
    1
    Mar 20, 2014
    Thanks!
     
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