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For parallel-connected capacitors the equivalent capacitance can be expressed as
C = C1 + C2 + . . + Cn (1)
where
C = capacitance (Farad, F, μF)
It is common to use µF.

For series-connected capacitors the equivalent capacitance can be expressed as
1/C = 1/C1 + 1/C2 + . . + 1/Cn (2)
The equivalent capacitance of two capacitors with capacitance 10 μF and 20 μF can be calculated as
in parallel
C = (10 μF) + (20 μF)
= 30 (μF)
in series
1/C = 1/(10 μF) + 1/(20 μF)
= 0.15 (1/μF)
or
C = 1 / 0.15 (1/μF)
= 6.7 (μF)
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