# Inductive Reactance formula

Inductive reactance formula is used to calculate the inductance of circuit with the change in frequency. In DC electrical circuits the current flowing through any circuit depends on the amount of resistance present in the circuit. In inductive circuits, the opposition to current flow is measured in terms of inductive reactance. Unlike dc, this reactance depends on the frequency. The basic equation which relates reactance to frequency is:

XL = 2 π fL

The graph between Xand frequency is shown below:

One interesting thing which should be noticed is that for f=0, the reactance is zero and thus we have a short circuit.

Example: Find the reactance of 10 mH inductors at 50 Hz.

Solution: f = 2 * 3.1416 * 50 * 10 * 10-3 = 3.1516 Hz

The table below explains the mathematical relationship of 10 mH, 100 mH and 1 H for frequencies from 1-60 Hz.

f 10 mH 100 mH 1 H
1 0.062832 0.62832 6.2832
2 0.125664 1.25664 12.5664
3 0.188496 1.88496 18.8496
4 0.251328 2.51328 25.1328
5 0.31416 3.1416 31.416
6 0.376992 3.76992 37.6992
7 0.439824 4.39824 43.9824
8 0.502656 5.02656 50.2656
9 0.565488 5.65488 56.5488
10 0.62832 6.2832 62.832
11 0.691152 6.91152 69.1152
12 0.753984 7.53984 75.3984
13 0.816816 8.16816 81.6816
14 0.879648 8.79648 87.9648
15 0.94248 9.4248 94.248
16 1.005312 10.05312 100.5312
17 1.068144 10.68144 106.8144
18 1.130976 11.30976 113.0976
19 1.193808 11.93808 119.3808
20 1.25664 12.5664 125.664
21 1.319472 13.19472 131.9472
22 1.382304 13.82304 138.2304
23 1.445136 14.45136 144.5136
24 1.507968 15.07968 150.7968
25 1.5708 15.708 157.08
26 1.633632 16.33632 163.3632
27 1.696464 16.96464 169.6464
28 1.759296 17.59296 175.9296
29 1.822128 18.22128 182.2128
30 1.88496 18.8496 188.496
31 1.947792 19.47792 194.7792
32 2.010624 20.10624 201.0624
33 2.073456 20.73456 207.3456
34 2.136288 21.36288 213.6288
35 2.19912 21.9912 219.912
36 2.261952 22.61952 226.1952
37 2.324784 23.24784 232.4784
38 2.387616 23.87616 238.7616
39 2.450448 24.50448 245.0448
40 2.51328 25.1328 251.328
41 2.576112 25.76112 257.6112
42 2.638944 26.38944 263.8944
43 2.701776 27.01776 270.1776
44 2.764608 27.64608 276.4608
45 2.82744 28.2744 282.744
46 2.890272 28.90272 289.0272
47 2.953104 29.53104 295.3104
48 3.015936 30.15936 301.5936
49 3.078768 30.78768 307.8768
50 3.1416 31.416 314.16
51 3.204432 32.04432 320.4432
52 3.267264 32.67264 326.7264
53 3.330096 33.30096 333.0096
54 3.392928 33.92928 339.2928
55 3.45576 34.5576 345.576
56 3.518592 35.18592 351.8592
57 3.581424 35.81424 358.1424
58 3.644256 36.44256 364.4256
59 3.707088 37.07088 370.7088
60 3.76992 37.6992 376.992