# Capacitive Reactance Definition

In physics, **capacitive reactance** is defined as the **opposition offered** by a **capacitor** to **change** the **potential difference or voltage** across its plates. **Capacitance** values are typically **measured in ohm (Ω)** and **represented** by **(X _{c})**. Moreover, the value of

**capacitive reactance**relies on how quickly a

**capacitor charges**and

**releases electrons**in

**electromagnetic fields**. Or in other words, capacitive reactance is said to be

**inversely proportional**to the

**capacitance and signal frequency**.

**Table of Contents**

## Formula of Capacitive Reactance

To know how to calculate a capacitor's charge, you can use the formula listed below:

X_{c}= 1 / (2πfC)

**Where,**

C = Capacitance

f = Frequency

2π = 6.283

**Note:**

To calculate the capacitive reactance, you can use our Capacitive Reactance Calculator.

### Example

To get a better understanding of how capacitive reactance works, let's solve an example below:

Suppose if a circuit has a capacitor of 350nF, providing a current at the frequency of 15 kHz, then determine a capacitor's capacitive reactance value.

**Given data**

Capacitance = C = 350 nF = 350 × 10^{-9}F

Frequency = f = 15 kHz = 15 × 10^{3}Hz

**To Find**

Capacitive reactance = ?

**Solution**

To find out the capacitive reactance of a capacitor, we will use the formula listed below:

X_{c}= 1 / (2πfC)

Putting values in the formula:

X_{c}= 1 / (6.283) × (15 × 10^{3}Hz) × (350 × 10^{-9}F)

X_{c}= 30.31 Ω