모든 주파수에서 인덕티브 리액턴스(XL) 및 임피던스를 계산하세요. 위상 관계를 시각화하고 AC 회로에서 인덕터의 동작을 이해하세요.
Select inductor value
Operating frequency
XL = 2πfL
φ = +90°
Voltage leads current by 90°
Inductive Reactance
62.83 Ω
XL = 2πfL
Phase Angle
+90°
Impedance
+j62.83
Inductive reactance (XL) is the opposition that an inductor presents to alternating current (AC). Unlike resistance, which dissipates energy as heat, reactance stores energy temporarily in a magnetic field and returns it to the circuit.
XL = 2πfL
In a pure inductor circuit, the voltage leads the current by 90 degrees. This is because voltage is proportional to the rate of change of current. This is expressed in complex notation as Z = +jXL.
XL = 0, inductor acts as short circuit (passes DC)
Low XL, inductor allows current to flow
High XL, inductor blocks AC current
Range: nH - µH
Frequency: MHz to GHz
Advantages:
Limitations:
Range: µH - mH
Frequency: kHz to MHz
Advantages:
Limitations:
Range: mH - H
Frequency: DC to kHz
Advantages:
Limitations:
Range: nH - µH
Frequency: MHz to GHz
Advantages:
Limitations:
Quality factor (Q = XL/R) indicates how efficiently the inductor stores energy. Higher Q means lower losses.
SRF is where parasitic capacitance resonates with inductance. Above SRF, the inductor acts capacitive.
Current at which inductance drops by a specified percentage (typically 10-30%). Critical for power applications.
Inductive reactance (XL) is the opposition an inductor presents to alternating current. It is measured in ohms and calculated using the formula XL = 2πfL, where f is frequency and L is inductance. Unlike resistance, reactance depends on frequency and stores energy in a magnetic field.
As frequency increases, the rate of change of current increases, which induces a larger back-EMF in the inductor. This greater opposition to current change results in higher reactance. At DC (f=0), an ideal inductor has zero reactance (short circuit).
In a pure inductor, voltage leads current by 90 degrees. This is because voltage is proportional to the rate of change of current (V = L di/dt). When current is changing most rapidly (zero crossing), voltage is at its maximum. This phase lead is represented by +j in complex impedance notation.
Self-resonant frequency is the frequency at which the inductor's parasitic capacitance resonates with its inductance. Above SRF, the inductor behaves like a capacitor. For reliable operation, use inductors well below their SRF.
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