Capacitores em Série
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
série
About this calculator
This calculator determines the equivalent capacitance of two or more capacitors connected in series. In a series connection, the charge on each capacitor is the same, but the voltages add up. The formula used is the sum of the reciprocals of the capacitances: 1/C_eq = 1/C₁ + 1/C₂ + ... + 1/Cₙ. The result is always smaller than the smallest individual capacitance.
To use the tool, enter the capacitance values in farads (or submultiples such as microfarads or picofarads). The calculator automatically converts units and provides the equivalent capacitance. It is useful in electronic circuit design, such as filters, power supplies, and timing circuits, where a specific capacitance value is needed by combining available components.
Important precautions: ensure all capacitors are in the same unit before entering. Remember that the total voltage rating of the series combination is the sum of individual voltage ratings, but the equivalent capacitance decreases. In AC circuits, also consider frequency and capacitive reactance. This tool does not replace full circuit analysis but speeds up initial calculations.
Common use cases include: adjusting capacitance in oscillators, voltage division in high-voltage circuits, and combining capacitors of different values to achieve a precise capacitance. Students, technicians, and engineers can use this calculator to quickly verify results from projects or labs.
Frequently asked questions
Why is the equivalent capacitance in series smaller than the smallest capacitance?
Because the effective distance between plates increases, reducing the total capacitance, since capacitance is inversely proportional to distance.
Can I mix capacitors with different voltage ratings in series?
Yes, but the total applied voltage must not exceed the sum of individual ratings. Also, voltage divides inversely to capacitance, so smaller capacitors may experience higher voltage.
How to calculate the equivalent capacitance of three capacitors in series?
Use the formula 1/C_eq = 1/C1 + 1/C2 + 1/C3. Enter the values into the calculator and it will provide the result.
Does the calculator accept values in microfarads and picofarads?
Yes, it automatically converts units to farads. Just enter the number and select the correct unit.
What is the advantage of connecting capacitors in series?
It allows obtaining a smaller capacitance than available and increases the voltage rating of the combination, useful in high-voltage circuits.