Dielectrical constant / relative permittivity

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SUMMARY

The discussion centers on the relationship between relative permittivity and charge levels in capacitors. It is established that in an ideal capacitor, the relative permittivity remains constant regardless of the electric field. However, real capacitors exhibit nonlinearity, particularly at high voltages, which can lead to breakdown. This highlights the importance of understanding dielectric behavior in practical applications.

PREREQUISITES
  • Understanding of capacitor fundamentals
  • Knowledge of electric fields and their effects on dielectrics
  • Familiarity with dielectric materials and their properties
  • Basic concepts of nonlinearity in electrical components
NEXT STEPS
  • Research the effects of electric fields on dielectric materials
  • Study the breakdown mechanisms in capacitors at high voltages
  • Explore the concept of nonlinear dielectrics in practical applications
  • Learn about the mathematical modeling of permittivity in real capacitors
USEFUL FOR

Electrical engineers, materials scientists, and anyone involved in capacitor design and analysis will benefit from this discussion.

nikkebargell
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Hi!

Im woundering if the relative permittivity in a capacitor is dependent on
the level of charge in the capacitor?

/Nikke.
 
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The charge on the capacitor affects the E field through the dielectric. In an ideal capacitor the permittivity is independent of field. Real devices have some degree on nonlinearity (eg at high voltages they will simply break down).
 
ok cool, that's what i thought.

cheers
 

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