Talk:Capacitor

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e·h·w·Stock post message.svg To-do:

  • Expand the History section: what about more modern developments (Surface mount components etc)? Needs a lot of references!
  • Add references to theory section and copyedit
  • Draw a diagram of the equivalent circuit and add to the appropriate section
  • Improve references in nonideal behaviour section
  • Copyedit and improve references in Capacitor types section
  • Restructure and tidy the applications section: there are too many small sections!
  • Add references to the safety section

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Thanks to the author(s) from the Tatar Wikipedia participants[edit]

Thank you, the author(s) of this article. We translated your article into the Tatar language.--A.Khamidullin (talk) 12:34, 26 March 2017 (UTC)

Displacement used incorrectly[edit]

Displacement is being used incorrectly in the third paragraph of the lede. Displacement current only occurs inside the capacitor. There is no displacement current in the source circuit or the battery. There is conduction current in the source circuit that is equal to the displacement current in the capacitor, so it is not egregiously incorrect. But, the notion of displacement current is not displacement through the external circuit. It is the displacement of bound charges in the dielectric from their equilibrium position. In the case of a high permittivity dielectric, it is easy to visualize the electron orbitals slightly distorted such that the electrons spend more time on one side of their molecules compared to the orbital with no applied field. In the case of a vacuum, it is harder to visualize. In Maxwell’s time, the vacuum was thought to be a polarizable media just like any other dielectric. But no matter how hard it is to visualize, the displacement current occurs between the plates of the capacitor and not in the battery. Constant314 (talk) 20:25, 11 April 2017 (UTC)

Agree, this paragraph is confused. I think "displacement current" should not be mentioned in the introduction, as this advanced term is bound to confuse general readers, making them think an actual current of charges passes between the capacitor plates. --ChetvornoTALK 20:59, 11 April 2017 (UTC)

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Permittivity symbol is confusing[edit]

The symbol used for the permitivity in equations in the text seems to be different than the symbol used in the larger equations. Maybe it's just italicized but it looks like a different symbol. I changed the symbols in the "parallel plate model" section to be consistent, but I did not continue to the rest of the article as I am not familiar with the topics.