Inductance Calculator
Calculate inductive reactance (XL) and energy stored in an inductor from inductance and frequency. Also computes resonant frequency for LC circuits.
Reactance X_L
3.7699 Ω
Energy
5.0000 mJ
How to use the inductance calculator
Enter inductance (mH), frequency (Hz), and current (A).
Formula & explanation
Inductive reactance: X_L = 2πfL. Energy stored: E = ½LI².
Examples
10 mH at 60 Hz → X_L ≈ 3.77 Ω. 1 A → 5 mJ.
Frequently asked questions
- What is inductive reactance?
- Inductive reactance (X_L) is the opposition an inductor presents to AC current. It increases with both frequency and inductance: X_L = 2πfL.
- Why does an inductor block high frequencies more than low ones?
- Reactance is proportional to frequency, so a higher-frequency signal sees a higher impedance from the same inductor — this is the basis of low-pass filter design.
- Where is the energy stored in an inductor?
- Energy is stored in the inductor's magnetic field. The amount is E = ½LI², so doubling the current quadruples the stored energy.
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