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  • Role of dielectric in capacitor

    satty lavanya

    Member

    Updated: Oct 27, 2024
    Views: 1.3K
    Hello, I am Satty from Vishakhapatnam. Can someone tell me about the dielectrics in capacitors? What is their role? How do they function?
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  • Jeffrey Arulraj

    Member • Sep 20, 2012

    they are insulators
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  • Kaustubh Katdare

    Administrator • Sep 20, 2012

    satty lavanya
    tel me about the dielectrics in capacitors?
    What part of the article: <a href="https://en.wikipedia.org/wiki/Dielectric" target="_blank" rel="noopener noreferrer">Dielectric</a> is difficult for you to understand?
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  • vinod1993

    Member • Sep 20, 2012

    The main role of dielectrics in capacitors is to increase the value of capacitance of the capacitor. We all pretty well know that C=EA\D where E-permittivity. We know that the permittivity is the product of permittivity of free space and the permittivity of the medium. When air is the medium the permittivity of medium is unity but as dielectric is used in a capacitor the permittivity of medium is greater than unity and obviously the product is greater and thus the capacitance is greater. "K" I suppose she asks about the specific role of Dielectrics in Capacitors and not the literal "Dielectric".
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  • arunchary

    Member • Sep 20, 2012

    we can divided dielectric in to class as like follows

    ​
    •Classes of Dielectrics – Two basic groups (Class 1 and Class 2) are used in the manufacture of ceramic chip capacitors.​
    Class 1:dielectrics display the most stable characteristics of frequency, voltage, time and temperature coefficients (TC). TC is expressed as a % of capacitance change from a reference or parts per million per degree C (ppm/ºC). ​
    ​
    Class 2 :dielectrics offer much higher dielectric constants but with less stable properties with temperature, voltage, frequency, and time. TC is expressed as a % change from a reference (+- 15% over some range of temperature
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  • arunchary

    Member • Sep 20, 2012

    you can also know more about this capacitor with properties as follows in below link
    #-Link-Snipped-#
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  • arunchary

    Member • Sep 20, 2012

    hey you can see the types of dielectric with temperature on following link
    #-Link-Snipped-# Constants.htm
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