Impedance to Inductance Calculator
Determine the equivalent self-inductance of purely inductive loads from AC operating impedance and line frequency.
Impedance to Inductance Calculator
How to Use the Impedance to Inductance Converter
Determining inductance from alternating current (AC) circuit characteristics is simple. Follow these steps:
- 1Enter Impedance (Z): Input the impedance in Ohms and select your scaling unit.
- 2Enter Frequency (f): Input the operating line frequency and select unit.
- 3Click Calculate: Click 'Calculate Inductance' to view equivalent inductance in Henries.
How to Calculate Impedance to Inductance (Step-by-Step Guide)
Inductors oppose changes in current by producing a back-EMF voltage. This opposition is defined as inductive reactance (XL), which dictates the AC impedance of the component. The formulas and mathematical workflow are presented below.
Inductive Reactance Formula
Assuming a purely reactive, lossless coil where total impedance (Z) equals XL, we rearrange to isolate physical inductance (L):
Where:
- L: Inductance in Henries (H)
- Z: Purely inductive impedance in Ohms (Ω)
- f: Alternating current frequency in Hertz (Hz)
- π (pi): Mathematical constant approximately equal to 3.14159
Real-Life Scenario: Sizing an AC Line choke (50 Ohms at 60 Hz)
An electrical technician wants to verify the winding inductance needed for an input choke. The choke must present 50 Ohms of impedance on a 60 Hz utility line. Sizing is calculated as:
- 1Set Parameters:
Z = 50 Ω,f = 60 Hz. - 2Multiply Constants:
2 × π × f = 2 × 3.14159 × 60 = 376.9911 - 3Divide Impedance:
L = 50 ÷ 376.9911 ≈ 0.1326 H - 4Convert Units:
L = 0.1326 H = 132.63 mH
Final Output: The required choke must provide exactly 0.1326 Henries (132.63 mH) of inductance.
Impedance to Inductance Reference Conversion Chart
The table below displays pre-calculated inductance values (H) for common AC impedances at a standard line frequency of 60 Hz:
| Impedance (Ω) | Inductance (H) at 60 Hz | Inductance (mH) at 60 Hz |
|---|---|---|
| 5 Ω | 0.0133 H | 13.26 mH |
| 10 Ω | 0.0265 H | 26.53 mH |
| 20 Ω | 0.0531 H | 53.05 mH |
| 50 Ω | 0.1326 H | 132.63 mH |
| 100 Ω | 0.2653 H | 265.26 mH |
| 200 Ω | 0.5305 H | 530.52 mH |
Inductor Impedance Formula
Under alternating current, the mathematical inductor impedance formula is expressed as:
Z_L = jωL = j(2πfL), where 'j' represents the imaginary unit indicating a 90-degree phase shift.
Inductor vs Impedance
Comparing an inductor vs impedance reveals that the inductor is a physical component, whereas impedance represents the total vector opposition (combining reactance and DCR resistance) to AC flow.
Impedance of Capacitor
Unlike coils, the impedance of capacitor components drops as line frequency increases, defined by the inverse relationship:
Z_C = 1 ÷ (j2πfC).
Impedance of Inductor and Capacitor
Combining the impedance of inductor and capacitor in series yields a net reactance of X = XL - XC, which dictates overall current phase angles.
Capacitor Impedance Calculation
A standard capacitor impedance calculation relies on frequency and capacitance to match tuning networks in RF power amplifiers.
Impedance of Inductor Derivation
The mathematical impedance of inductor derivation relies on Faraday's law of induction:
v(t) = L × (di/dt), which translates to the frequency domain as V = jωLI.
Frequently Asked Questions (FAQs)
Inductance is the physical property of a coil. Impedance is the AC current restriction that results from that property at a given operating frequency.
Divide the purely inductive impedance (Ohms) by 2 times pi times the frequency (Hertz) to isolate the inductance: L = Z ÷ (2 × π × f).
Multiply the physical inductance (Henries) by the angular frequency: Z = 2 × π × f × L. This yields the reactive impedance in Ohms.
AC circuits contain three types of vector components: real Resistance (R), Inductive Reactance (XL), and Capacitive Reactance (XC).
Apply a small AC voltage across the coil at a set frequency, measure the current flow, and divide voltage by current to find Z: Z = V ÷ I.
Inductance is measured in Henries (H), while impedance (opposition to current flow) is measured in Ohms (Ω).
The resistive component of a real inductor is its DC wire resistance (DCR), which can be measured directly using a digital multimeter or ohm meter.