In the circuit, when current flows through the conductor, an electromagnetic field is generated. The magnitude of the electromagnetic field divided by the magnitude of the current is the inductance.
Inductance is defined as L = phi / i

Inductance is a measure of the electromagnetic induction coil capacity. When a current is applied to an inductor, a magnetic field is generated around the coil, and a magnetic flux passes through the coil. The greater the power supplied to the coil, the stronger the magnetic field and the greater the flux through the coil. Experiments show that the magnetic flux through the coil and the current is directly proportional to the ratio of their called self-inductance, also known as inductance. If the flux through the coil with φ said that the current I said inductance L said,

As shown above air coil inductance unit commonly used to represent T, you can also use UH NH, with T said air-core coil refers to the number of air-core coil structure parameters, UH, NH air-core coil electrical parameters. The inductance unit T and the inductance unit UH both can operate the important parameters of the air core coil without conflict.

Inductor is the strength of the current that can be sensed when the coil is moving in a magnetic field. The inductance unit is "Henry" (H). Also refers to the use of components made of this nature. Common inductance unit UH (micro enjoy), the relationship between the inductance unit UH and H is as follows:
Inductance unit conversion:
(1), inductance unit is Henry, the symbol is "H".
(2) Inductance conversion: 1H = 1000mH = 1000,000uH = 1000,000,000nH = 1000,000,000,000pH
(3), the inductor is divided into two types of general inductors and precision inductors, the main difference is the part of the error value and part of the surface that the number of different bits of the code.
General Inductance: The error value is ± 20%; Its indication code is: M
The error is ± 10%; its code is: K
Precision Inductance: The error is ± 5%; its code is: J
The error is ± 1%; the code is: F
(4), conversion rules are as follows:
General Inductance Precision Inductance
Value (AB) × 10n = Inductance ± Error (10%); Value (AB) × 10n = Inductance ± Error (5%);
Example: 103k = 10 × 1000 = 10mH ± 10%
221k = 22 * 10 = 220UH ± 10%
680k = 68uh ± 10%
100M = 10UH ± 20%
(5) In addition to the above conversion rules in addition to the inductance, there are other ways to represent the code, and because of the different manufacturers, the code is not the same, the conversion of this resistance should be based on the manufacturer's code table Check the conversion.