capacitor

Discussion in 'General Electronics Chat' started by TAKYMOUNIR, Feb 4, 2013.

  1. TAKYMOUNIR

    Thread Starter Active Member

    Jun 23, 2008
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    how the capacitor store energy
     
  2. DerStrom8

    Well-Known Member

    Feb 20, 2011
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    ....Is that the whole question? Having over 200 posts, I expected you'd have learned by now that we need fully-worded, clear questions in order to give good answers.

    Anyway, capacitors do not store energy. Simple as that. Instead, they store charge.

    There's a nice little write-up here: http://www.physics.sjsu.edu/becker/physics51/capacitors.htm
     
  3. TAKYMOUNIR

    Thread Starter Active Member

    Jun 23, 2008
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    I think my question is clear ,any way thanks,but the capacitor store energy=1/2 cv^2
     
  4. crutschow

    Expert

    Mar 14, 2008
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    That would seem to an overly restrictive definition. ;)

    Capacitors actually store both, of course. They store energy by storing charge as determined by the voltage applied to transfer the charge.
     
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  5. DerStrom8

    Well-Known Member

    Feb 20, 2011
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    I stand corrected. :rolleyes:
     
  6. MrChips

    Moderator

    Oct 2, 2009
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    Not quite. Charge, voltage and capacitance are all inter-related, much like Ohm's Law.


    V = \frac{Q}{C}

    Hence the energy stored in a capacitor of a given capacitance C can can be determined entirely from charge Q,

    E = \frac{1}{2}\frac{Q^2}{C}

    or from voltage V,

    E = \frac{1}{2}CV^2
     
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  7. DerStrom8

    Well-Known Member

    Feb 20, 2011
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    Yup, I remember seeing that before, specifically the last one. Not really sure what I was thinking.

    Guess it's been too long since I did any math relating to electronics! :eek::p
     
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