ToolsElectronics, cables & data
Reactance & LC resonance
Capacitive and inductive reactance at a frequency, and the resonance of an LC pair.
Hz
µF
mH
- Capacitive reactance X_C
- 159.155Ω
- Inductive reactance X_L
- 6.28319Ω
- LC resonance frequency
- 5032.92Hz
- Characteristic impedance √(L/C)
- 31.6228Ω
A capacitor's reactance falls with frequency, an inductor's rises. At resonance they are equal: the basis of passive crossovers and tuned circuits.
How it works
Capacitors and inductors resist alternating current in a frequency-dependent way. These relationships underlie crossovers, filters and EMI suppression.
Formulas
- X_C = 1 / (2π f C)
- X_L = 2π f L
- f₀ = 1 / (2π √(L C))
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