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Inductive Reactance Calculator (Frequency Sweep)

Calculate reactance (XL) for inductors with a dynamic frequency sweep visualization. Includes standard constant libraries and frequency presets.

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About

Inductive reactance, denoted as XL, is the opposition that an inductor presents to the flow of alternating current (AC). Unlike resistance, which is constant, reactance is directly proportional to the frequency of the signal. This property makes inductors essential in filter design, blocking high-frequency noise while allowing low-frequency signals to pass.

This tool calculates the specific reactance in Ohms (Ω) given the inductance (L) and frequency (f). It also features a Frequency Sweep graph, visualizing the linear relationship XL ∝ f across a spectrum. This is critical for audio engineers and RF designers ensuring their components operate correctly within the target bandwidth.

electronics inductance reactance ac circuits physics

Formulas

The magnitude of inductive reactance is calculated using the angular frequency formula:

XL = 2 π f L

Where:

  • π ≈ 3.14159
  • f is frequency in Hertz
  • L is inductance in Henries

Reference Data

ParameterSymbolUnitFormula Relationship
Inductive ReactanceXLOhms (Ω)Linear increase with f
InductanceLHenry (H)Constant property of coil
FrequencyfHertz (Hz)Input variable
Angular Frequencyωrad/sω = 2πf

Frequently Asked Questions

At 0 Hz (Direct Current), the frequency term is zero, making the reactance zero. The inductor acts as a short circuit (ideal wire) to DC, only possessing its parasitic resistance.
The formula X_L = 2 * pi * f * L is a linear equation of the form y = mx, where y is reactance and x is frequency. This confirms that reactance increases linearly with frequency, assuming the inductor is ideal and does not have significant parasitic capacitance.
No. Capacitors have 'Capacitive Reactance' (Xc), which is inversely proportional to frequency (1 / 2*pi*f*C). While inductors block high frequencies, capacitors pass them.