Before vacuum electrical breakdown occurs (perfect vacuum between the parallel plates for my case)

I found this calculator https://math-physics-calc.com/electric-field-strength-in-capacitors-calculator

but not sure how to interpret the results

area of plate for example 100m2


1 Answer 1

  1. The vacuum between the plates of your ideal capacitor is not going to break down. Rather, the material of the plates will determine when an arc occurs, once the field strength becomes high enough to produce field emission.

  2. The calculator you found just tells you what the field strength will be for a given charge on a ideal capacitor with a given plate area. It doesn't tell you anything about breakdown behavior.

  3. Real capacitors break down before the theoretical limit is reached, for example due to rough spots on a plate concentrating the field locally, or due to impurities in the dielectric. This makes the theoretical limit more or less moot, or at best an unreachable limit as manufacturing technique improves.

  • $\begingroup$ but how can i calculate it? $\endgroup$
    – James
    May 7 at 2:48
  • $\begingroup$ I want to know how many amperes can my superconductive capacitor hold $\endgroup$
    – James
    May 7 at 3:00
  • $\begingroup$ There is a discussion here, Superconducting Capacitor for Energy Storage? $\endgroup$
    – Farcher
    May 7 at 7:27
  • $\begingroup$ @James the point of my 3rd point is that calculation is not useful. You will have to build it and test it, because the real performance is determined by factors that the theoretical model doesn't capture. This means it's an engineering problem, not physics. $\endgroup$
    – The Photon
    May 7 at 13:32

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.