Inductance Calculator
Reactance at frequency, and where L and C cancel.
Work out Inductance. Reactance at frequency, and where L and C cancel. Free, with no account and nothing to download.
Optional — gives the resonant frequency.
Inductive reactance (Ω)
6.2832
Resonance at 5,032.92 Hz
XL = 2πfL, so an inductor's opposition rises with frequency — it passes DC freely and blocks high frequencies. A capacitor does exactly the opposite, with XC = 1/(2πfC). Where the two are equal they cancel, and that is resonance: 5,032.9 Hz here, which is how a radio selects one station out of the whole band.
How the Inductance Calculator works
XL = 2πfL, so an inductor's opposition rises with frequency — it passes DC freely and blocks high frequencies. A capacitor does exactly the opposite. Where the two are equal they cancel, and that is resonance: the mechanism a radio uses to select one station out of the whole band.
Also known as: inductive reactance calculator · resonant frequency calculator · lc circuit calculator · reactance formula
Frequently asked questions
What is inductive reactance?
An inductor's opposition to alternating current, XL = 2πfL. A 1 mH inductor at 1 kHz presents 6.28 Ω.
How is it different from resistance?
Reactance stores and returns energy rather than dissipating it as heat, and it depends on frequency. A resistor behaves the same at every frequency; an inductor does not.
What is resonant frequency?
Where inductive and capacitive reactance are equal and cancel: 1/(2π√(LC)). A 1 mH and 1 µF pair resonates at 5.03 kHz.
Why does an inductor block high frequencies?
Because reactance is proportional to frequency. Double the frequency, double the opposition — which is what makes inductors useful as filters and chokes.
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