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why +ve terminal of electrolytic caps must be connected to +ve of battery?

Discussion in 'Power Electronics' started by dexterdev, Feb 21, 2012.

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  1. dexterdev


    Feb 6, 2012
    Hi all,
    I have a doubt regarding electrolytic capacitor. Why the electrolytic capacitor should be connected to higher DC potential in the circuit. What happens if the opposite happens? Also how electrolytic capacitors must be used where varying voltage comes across it?

  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Because they're a polarised component and work properly within certain parameters, one of which is the polarity of the voltage across them.

    Note that there are non-polarised electrolytics which can be connected either way around.

    Something between nothing and *BOOM*.

    many electrolytics can withstand a small reverse voltage without significant harm.

    However when operated with the incorrect polarity, you will almost certainly have a much larger leakage and lower capacitance.

    As log as the voltage varies from zero to the rated voltage it's fine. Problems occur when you exceed the maximum voltage or you have a significant reverse polarity.
  3. dexterdev


    Feb 6, 2012
    thankyou sir for the reply
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