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    kesavan's Avatar
    kesavan Posts: 118, Reputation: 1
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    #1

    Mar 24, 2008, 10:01 AM
    Capacitor polarity
    In electrolytic capacitor, why polarity is important?
    Credendovidis's Avatar
    Credendovidis Posts: 1,593, Reputation: 66
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    #2

    Mar 24, 2008, 10:17 AM
    Quote Originally Posted by kesavan
    In electrolytic capacitor, why polarity is important?
    Because the increase in capacity (they normally have big values) is obtained by using materials that are sensitive to voltage polarisation.
    If you connect the wrong way, the capacitor will leak, heat up, and even can explode.
    ;)
    kesavan's Avatar
    kesavan Posts: 118, Reputation: 1
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    #3

    Mar 24, 2008, 10:28 AM
    I thing one plate is Aluminum & other is Aluminum oxide,
    So what happen in capacitor when we change polarity?
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #4

    Mar 24, 2008, 10:34 AM
    If an electrolytic capacitor is reverse-biased, then the aluminium oxide layer that acts as the dielectric will reduce and be destroyed. Once this layer is destroyed, the 2 plates will be in contact and the device will short circuit, heating the device up causing leakage or explosion.
    kesavan's Avatar
    kesavan Posts: 118, Reputation: 1
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    #5

    Mar 27, 2008, 10:20 AM
    How that destroyed?
    Please tell more details
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #6

    Mar 27, 2008, 11:00 AM
    Quote Originally Posted by kesavan
    how that destroyed?
    please tell more details
    By reduction, the oxygen is stripped from the aluminium, like electrolysis.
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