Calculate the reactance

*X*

_{C}. Choosing a capacitor

*C*and frequency

*f*is best.

Capacitive reactance (symbol

*X*

_{C}) is a measure of a capacitor's opposition to

AC (alternating current). Like resistance it is measured in ohms, but

reactance is more complex than resistance because its value depends on the

frequency (

*f*) of the electrical signal passing through the capacitor as well

as on the capacitance,

*C*.

Capacitive reactance,

*X*

_{C}= 1 / (2 × π ×

*f*×

*C*)

where:

*X*

_{C}= reactance in ohms (ohm),

*f*= frequency in hertz (Hz),

*C*= capacitance in farads (F)

The reactance

*X*

_{C}is large at low frequencies and small at high frequencies.

For steady DC which is zero frequency,

*X*

_{C}is infinite (total opposition),

hence the rule that capacitors pass AC but block DC.

For example a 1 µF capacitor has a reactance of 3.2 kΩ for a 50 Hz signal, but

when the frequency is higher at 10 kHz its reactance is only 16 Ω.

**Capacitance**

*C***, frequency**

*f***, and capacitive reactance**

*X*_{C}

Enter the values for capacitance and frequency, then press "calculate".

Carl says

What is the meaning of c2 in your FM circuit? Please show me a photo of it.you said you can tune it with screw driver

freddy rafael sanchez sanchez says

gracias por la calculadora gracias por sus articulos le estoy siguiendo gracias por difundir conocimiemto util para nosotros le felicito por su loable gesto freddy sanchez managua nicaragua

Swagatam says

Thank you! Appreciate your response very much!!