Capacitive Reactance Calculator


About Capacitive Reactance Calculator (Formula)

A Capacitive Reactance Calculator is a tool used to determine the capacitive reactance of a capacitor in an AC (alternating current) circuit. Capacitive reactance is a measure of how much opposition a capacitor provides to the flow of alternating current, similar to resistance in a direct current (DC) circuit. It is influenced by the frequency of the AC signal and the capacitance of the capacitor.

The formula for calculating capacitive reactance is:

Capacitive Reactance (Xc) = 1 / (2πfC)


  • Capacitive Reactance (Xc) is the opposition offered by the capacitor to the flow of alternating current, measured in ohms (Ω).
  • π (pi) is a constant approximately equal to 3.14159.
  • f is the frequency of the alternating current signal in hertz (Hz).
  • C is the capacitance of the capacitor in farads (F).

To use the Capacitive Reactance Calculator formula, follow these steps:

  1. Determine the frequency of the AC signal (f) in hertz.
  2. Determine the capacitance of the capacitor (C) in farads.
  3. Plug the values of frequency (f) and capacitance (C) into the formula: Capacitive Reactance (Xc) = 1 / (2πfC).
  4. Calculate the capacitive reactance (Xc) in ohms.

Capacitive reactance increases as the frequency of the AC signal increases, meaning that capacitors allow more current to flow at higher frequencies. This is in contrast to resistors, where resistance remains constant regardless of frequency.

Capacitive reactance is an essential concept in AC circuit analysis and is often used in conjunction with other components like resistors and inductors. It’s particularly important in fields like electronics, telecommunications, and power distribution.

In summary, a Capacitive Reactance Calculator assists in determining the opposition provided by a capacitor to alternating current in a circuit. The formula considers frequency and capacitance to calculate capacitive reactance, a critical parameter for understanding AC circuit behavior.

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