In electrical schematics, bills of materials, and written descriptions, it is customary to use C as a capacitor, R as a resistance, D as a diode, T as a transformer, Q as a transistor, and L as an inductance. Why is the inductance as L? As a rule, I like to use the first letter of the English alphabet as an abbreviation of something, such as: capacitance C is the abbreviation of capacitance, resistance R is the abbreviation of resistance,… the English letter of inductance is inductance, and "I" It is expressed as a unit of current.

Therefore, the inductance is represented by L. From a personal point of view, one must be mentioned. This person is Lenz from Estonia. His English name is: "Lenz, Heinrich Friedrich Emil". This physicist has An important contribution, he discovered the Lenz law of electromagnetic induction. Lenz's law is a law of electromagnetism. From electromagnetic induction, the direction of induced electromotive force is derived.

The magnetic field of the induced current always obstructs the change of the magnetic flux that causes the induced current. The inductor is a typical electromagnetic induction element, to commemorate the physicist Lenz, and later generations use his English abbreviation "L" as the representation of the inductor.