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What is the capacitance of three 100-microfarad capacitors connected in series?

About 33.3 microfarads.

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  1. 0.33 microfarads
  2. 300 microfarads
  3. 33.3 microfarads ✔

Why: Capacitors in series combine like resistors in parallel: add the reciprocals. Three equal capacitors in series give one third of one capacitor, about 33.3 microfarads.

Huh, didn't know that: In parallel, capacitances simply add, so the same three would make 300 microfarads.

The dad joke
Series capacitors share the load like friends splitting one pizza: everyone gets a smaller slice.
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References

Answer: 33.3 microfarads. Capacitors in series combine like resistors in parallel: add the reciprocals. Three equal capacitors in series give one third of one capacitor, about 33.3 microfarads.

  1. NCVEC 2023-2027 General Class Pool and Syllabus (6th Errata, Feb 4 2026) ncvec.org/downloads/General%20Class%20Pool%20and%20Syllabus%202023-2027%20Public%20Release%20with%206th%20Errata%20Feb%204%202026.pdf
    33.3 microfarads
    Checked 2026-10-11.
  2. Capacitors in Series and in Parallel (OpenStax University Physics via LibreTexts) phys.libretexts.org/Bookshelves/University_Physics/University_Physics_(OpenStax)/University_Physics_II_-_Thermodynamics_Electricity_and_Magnetism_(OpenStax)/08%3A_Capacitance/8.03%3A_Capacitors_in_Series_and_in_Parallel
    the reciprocal of the equivalent capacitance is the sum of reciprocals of individual capacitances
    Checked 2026-10-11.

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