capacitor resistor circuit exercise book question REVISION

Discussion in 'Homework Help' started by ign804, Dec 11, 2007.

  1. ign804

    Thread Starter New Member

    Dec 11, 2007
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    Attachment Is Circuit Diagram I Need To Find Out
    1 The Time In Milli Seconds For The Capacitor Voltage To Reach Your Value Of Charge Voltage

    2 The Value Of Capacitor Voltage After The Value Of Charge Time

    3 Assuming The Capicitor Is Fully Charged The Time In Milli Seconds For The Discharge Current To Reach Your Individual Value After The Switch Has Been Opened

    4 Assuming The Capacitor Is Fully Charged The Value Of Discharge Current At Your Individual Value Of Time After The Switch Has Been Opened

    Will Someone Be Able To Do This One And Show Me Working Out So I Can Do Second One On My Own
     
    • EX.doc
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  2. mentaaal

    Senior Member

    Oct 17, 2005
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    Problems like these are easily solved with the formula in the attachment.
    Just plug in the values supplied to find the unknown.

    the charge voltage i presume to be the voltage accross the capacitor and the charge time you put in for t etc. (i think anyway)

    [​IMG][​IMG][​IMG]
     
  3. ign804

    Thread Starter New Member

    Dec 11, 2007
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    Really Still Stuck Will You Be Able To Show Me Anyone So I Can Use This As An Example
     
  4. mentaaal

    Senior Member

    Oct 17, 2005
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    Ok take a look at the attachment
     
  5. thingmaker3

    Retired Moderator

    May 16, 2005
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  6. ign804

    Thread Starter New Member

    Dec 11, 2007
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    any more help really cant get head round it:mad:
     
  7. Distort10n

    Active Member

    Dec 25, 2006
    429
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    Where did you get those answers from? Charging time cannot be ~9ms through 220 ohms and 33mF.
     
  8. ign804

    Thread Starter New Member

    Dec 11, 2007
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    any help please
     
  9. Distort10n

    Active Member

    Dec 25, 2006
    429
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    Boy did I read this question wrong. Did Mentaal's explanation help at all or do you need a completed example?
     
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