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it depend on what is the usage of capacitor in the circuit
if it for Power factor compensation it should connected in parallel
if it use as low pass filter it should connected in parallel
if it used for high pass filter in should connected in series
for dividing voltage and reducing capacitance connect in series as capacitive voltage transformer
to maintain the voltage and increase the capacitance connect in parallel
association of capacitor is effective in both series and parallel. For example Capacitor is more effective in series for amplification and is more effective in Parallel for rectification purposes.
The best to use is Parallel
Its most effective when capacitor is connected in series.because its opposite of resistance.when the capacitor connected in series then the total capacitor capacitance is decrease from one individual capacitor capacitance.
but if u connected in parallel its acts like series connection resistance.
Ctotal=C1+C2+............+Cn
capacitor in parallel more effective because the total capacitance is large = the sum of capacitances
If concern is for high voltage maintanance, parallel connection is effective. If current must be maintained serial connection is effective
it depends on what are you going to use for cause parallel assosiation is used for recetification and in series is for amplification