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Reactance Calculator
Calculate inductive reactance, capacitive reactance, net series reactance, and LC resonant frequency for ideal AC circuit analysis.
Input Parameters
Results
Equations Used
Inductive Reactance: XL = 2πfL
Capacitive Reactance: XC = 1 / (2πfC)
Series Net Reactance: X = XL - XC
LC Resonance: f0 = 1 / (2π√(LC))
Frequently Asked Questions (FAQ)
Q1: What is reactance?
Reactance is the AC opposition caused by inductance or capacitance, measured in ohms.
Q2: Why does inductor reactance increase with frequency?
An inductor resists current changes more strongly at higher frequency, so XL rises with frequency.
Q3: Why does capacitor reactance decrease with frequency?
A capacitor passes higher-frequency AC more easily, so XC falls as frequency increases.
Q4: What does negative net reactance mean?
Negative net series reactance means the circuit is capacitively dominated.
Q5: What happens at LC resonance?
In an ideal series LC circuit, XL and XC are equal, so net reactance is near zero.
Q6: Are real inductors and capacitors ideal?
No. Real parts have ESR, ESL, tolerance, dielectric loss, saturation, and self-resonant frequency limitations.
