Active and passive Dielectrics



  • The dielectric materials may be classified as solid, liquid and gas dielectric.
  • In solid form they may be polymeric such as nylon, pvc, rubber, bakelite, asbestos and wool or may belong to the  ceramic family such as glass, silica, mica, porcelain, etc.
  • In liquid form they may be mineral insulating oils, synthetic insulating oils, etc.


  • In gaseous form they may be air, nitrogen, sulphur hexafluoride, inert gases etc.

Active dielectrics

        When dielectric is subjected to external electric field, if the dielectrics actively accept the electricity, then they are termed as active dielectrics. Thus active dielectrics are the dielectrics whi9ch can easily adapt itself to store the electrical energy in it.

Eg:: piezo-electrics, ferro-electrics etc.,

Passive dielectrics

        These dielectrics are also called insulating materials. As tha name itself suggest that it will act as an insulator, conduction will not take place through this dielectrics. Thus passive dielectrics are the dielectrics which restricts the flow of electrical energy in it

Eg:: All insulating materials such as glass, mica, etc.,
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