There are not many applications other than academics for capacitors connected in series. Capacitors in series may be used as Voltage dividers, but the divided Voltage may only be applied to an infinite impedance such as the gate of a field effect transistor amplifier or the grid of a class A vacuum tube amplifier..
Voltage rating issues is about the only reason, usually buy one capacitor with the correct voltage rating. I once had a bunch of duel 10 microfarad capacitors rated 475 volts. I connected 5 of them in series and applied about 1000 volts, then added one and two megohm resistors in parallel with the capacitors that read the most voltage. When I got the 5 about equal I switched to 2000 volts and only had to do minor trimming to get all 5 of them close to 400 volts.
Lets assume that you are making an oscillator circuit using a 74ls14 inverter.
You find that you need a 1 Meg pot moving from 10% to 90% rotation ans a C of .5uF. Look for a C of .5uF on the internet. they jump from .47uF to .63uF, oops. there are no .5uF caps. You, because you are smart and because I told you, connect two 1uF caps in series making a .5uF cap with double the voltage rating thereby saving mankind and society.
We work good together.
No.
It decreases the capacitance, and we won't want that. Is there any other reason besides the voltage rating issues?
