Why does reactance increase with frequency?

Faster-changing current induces a larger back-EMF opposing the current, increasing effective impedance.

Inductor vs capacitor reactance?

Inductor reactance rises with frequency; capacitor reactance falls. They are complementary.

What about DC resistance?

Real inductors have wire resistance (DCR) that adds to the impedance.

Inductor Impedance Calculator

Calculate the AC impedance (reactance) of an inductor at a given frequency.

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Inductance

Frequency

Inductive Reactance (XL)

62.83 Ω

Inductive Reactance (XL) vs Inductance

View formula & how it works →

Inductive Reactance

XL = 2 x pi x f x L

Reactance increases with frequency: inductors pass DC and block high frequencies (opposite of capacitors).

Example Calculation

10 mH inductor at 1 kHz.

01L = 10 mH = 0.01 H
02XL = 2 x pi x 1000 x 0.01 = 62.83 ohms

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Ohm's Law Guide

A complete guide to Ohm's Law. Learn the relationship between voltage, current, and resistance, with practical examples, the power triangle, and circuit analysis tips.

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