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• why are capacitors placed in parallel in AC to DC converter circuits (or in general)? Why not in series? What would happen if I place a cap in series?

• The link for decoupling in the article is giving me 404.

• Whoops. Looks like an issue between multi-page and single page viewing; works okay in single page. For multi-page, for now, that link should have been: https://learn.sparkfun.com/tutorials/capacitors/application-examples#decoupling

• The link named “in series” under Super caps is not working either. I guess it should be an anchor link too.

• I have a quick question. How come the equation C= Er*A/4(pi)D What is the 4 for. and what does pi have to do with capacitance

• Quick question, but slow answer - You’d have to go down the rabbit hole (start with either Coulomb’s Law or Gauss’s Law), but in short and rather simplified: this is related to modeling the total charge based on point charges on the plates' surface, the charge itself being modeled as a vector in polar coordinates - a sphere - which should give you some idea of where the 4⋅pi comes from :)

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