my question is about big capacitor and it's parasitic inductance.

[xljin2006]

we know big capacitor has two big plates of two electrodes. it's said capacitor has parasitic inductance because the plates are curled tight. my question is: how this can make parasitic inductance?how the electrons flow on the plate while the capacitor is changing or discharging?and the next question is more important: why the parasitic inductance is seriesly connected to the capacitor?

 

[ronsimpson]

so why they are series and not parallel?

Here is a plot from a VNA. It is a machine that measures the impedance of the capacitor at many different frequencies. On the left side is low frequency and the impedance is very high. We can see at 1mhz = 1 ohm. There is a resonant point at 17mhz and then the capacitor goes inductive. This is a very common graph for the capacitors that I have studied.

 

[JimB]

so why they are series and not parallel?

As demonstrated by ronsimpson, a capacitor exhibits a series resonance with its parasitic series inductance.

Also be aware that inductors have parasitic capacitance, which is effectively in parallel with the inductance.
So that an inductor exhibits a parallel resonance with its parasitic parallel capacitance.


JimB