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Self-inductance, or simply inductance, is a key concept in electromagnetism, a branch of physics. When current flowing through a coil changes, an electromotive force (EMF) is induced in the coil due to its magnetic field. This phenomenon is known as self-induction, and the constant of proportionality between the induced EMF and the rate of change of current is the self-inductance of the coil.

Inductance = |

The formula for self-inductance is derived from Faraday's law of electromagnetic induction:

E = -L × (dI/dt)

- E: Induced electromotive force (EMF) in the coil
- L: Self-inductance of the coil
- dI/dt: Rate of change of current

The formula and the concept of self-inductance were first introduced by the physicist and chemist Michael Faraday in the 19th century. Faraday's experiments with coils, magnets, and circuits led to the discovery of electromagnetic induction, which forms the basis for the principle of self-inductance.

The principle of self-inductance is employed in many devices and systems in our daily life, including transformers, inductors in AC circuits, and electrical motors. Inductors, for instance, are used in analog circuits and signal processing to filter out certain frequencies.

Michael Faraday, who discovered the principle of electromagnetic induction, and Heinrich Lenz, who formulated Lenz's law, are key contributors to the understanding of self-inductance. Their work in the 19th century laid the foundation for modern electromagnetism and electrical engineering.

- The principle of self-inductance and electromagnetic induction is the working principle behind most of the electrical appliances we use today, from electric motors to power generators.
- The understanding and application of self-inductance have greatly impacted humanity by enabling the generation and use of electric power, changing the face of technology and society.
- The measurement unit of inductance, the henry (H), is named after Joseph Henry, an American scientist who discovered self-inductance independently of Faraday.

Understanding the principle of self-inductance is fundamental in the field of electromagnetism and electrical engineering. By enabling the control and manipulation of electrical circuits and power, self-inductance plays a crucial role in our technologically driven world.

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