Reactance Calculator
Calculate inductive reactance (XL), capacitive reactance (XC), frequency, inductance, or capacitance.
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Find XC
Find f
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Find C
Hz kHz MHz
H mH µH
Common Component Values (fills L or C)
Inductive Reactance (XL)
62.83 Ω
f = 1000 Hz, L = 0.01 H
Formula
XL = 2πfL
Value in other units
0.0628 kΩ
Angular frequency ω
6283 rad/s
Reactance Formulas
XL = 2πfL
XC = 1/(2πfC)
f = XL / (2πL) or f = 1/(2πXCC)
L = XL / (2πf) C = 1/(2πfXC)
XL – inductive reactance (Ω)
XC – capacitive reactance (Ω)
f – frequency (Hz)
L – inductance (H)
C – capacitance (F)
ω = 2πf – angular frequency (rad/s)
XC – capacitive reactance (Ω)
f – frequency (Hz)
L – inductance (H)
C – capacitance (F)
ω = 2πf – angular frequency (rad/s)
People Also Ask
⚡ What is reactance and how is it different from resistance?
🔁 How does frequency affect inductive and capacitive reactance?
📏 What are typical reactance values for common components?
🎛️ How to calculate impedance using reactance?
🔧 Practical applications of reactance in circuits?
📉 Why is capacitive reactance negative in impedance?
Understanding Reactance
Reactance is the opposition of inductors and capacitors to alternating current (AC). It depends on frequency and is measured in ohms (Ω). Unlike resistance, reactance does not dissipate energy; it causes phase shift between voltage and current.
Inductive Reactance (XL)
XL = 2πfL. Increases with frequency and inductance. Inductors oppose changes in current, so at high frequencies they become high impedance.
Capacitive Reactance (XC)
XC = 1/(2πfC). Decreases with frequency and capacitance. Capacitors oppose changes in voltage, so at high frequencies they become low impedance (almost short).
Reactance at Different Frequencies
| Component | Value | Frequency | Reactance |
|---|---|---|---|
| Inductor | 10 µH | 1 MHz | 62.8 Ω |
| Inductor | 100 µH | 100 kHz | 62.8 Ω |
| Capacitor | 1 nF | 1 MHz | 159 Ω |
| Capacitor | 10 µF | 60 Hz | 265 Ω |
Detailed FAQs
What is the difference between reactance and impedance?
Impedance (Z) is the total opposition to AC, combining resistance (R) and reactance (X). Z = R + jX. Reactance is the imaginary part; it can be inductive (+jXL) or capacitive (-jXC).
How do I calculate the resonant frequency of an LC circuit?
At resonance, XL = XC, so f_res = 1/(2π√(LC)). This is the frequency where inductive and capacitive reactances cancel, giving minimum impedance (series) or maximum (parallel).