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An inductor establishes a magnetic field when current passes through it. Most of the inductors are in the range of milli Henry (mH) or micro Henry (H). These are available with air, ferrite, and iron cores. In today's market, there are several inductors available from various manufacturers and their size varies from larger to smaller units.
Inductor values can be determined mainly in two ways, namely text coding, and color coding methods. Some inductors are larger, thus often their values are printed on their body (nameplate details).
However, for smaller inductors, abbreviation or text is used because there may not be enough room, for printing the actual value on it. Also, some inductor values can be determined by reading the color on the body of inductors by comparing them with a color coding chart.