electrolytology - an inside look at capacitors

electrolytology elektor september 1980 — 9-33 eleeirolytology an inside look at capacitors There is nothing new about the fact that electrolytic capacitors possess inductance due to the method used in their construction. At high frequencies their impedance will be largely determined by this parasitic induction. An electrolytic capacitor even acts as a band pass filter and thus also has a resonant frequency. What fewer people will be aware of is that the capacitance is clearly frequency dependent. This has to do with moving ions in the electrolyte, which will be discussed later. being moved — in other words there is an electric current flowing. Since plate (a) is being charged and electrons are disappearing from plate (b), a potential difference occurs across the plates. Whenever this voltage is equal to that at the source, the electron flow will stop. The capacitor will then be fully charged. It should be mentioned that there is no current flowing from plate (a) to plate (b), ...