Short Answer

Inductance is the property of a conductor or coil by which it opposes any change in current flowing through it. It is measured in henry (H). This property is mainly found in inductors, which are usually coils of wire.

An inductor stores energy in the form of a magnetic field when current flows through it. When the current changes or stops, the stored energy is released back into the circuit. This makes inductors very useful in energy storage and filtering applications.

Detailed Explanation:

Inductance

In Electronics and Communication Engineering, inductance is a fundamental electrical property that describes the ability of a conductor to oppose changes in current. This effect occurs due to the magnetic field produced around the conductor when current flows through it.

When current flows in a coil, it creates a magnetic field around it. If the current changes, the magnetic field also changes. According to Faraday’s Law of Electromagnetic Induction, a changing magnetic field induces a voltage in the conductor that opposes the change in current. This opposing voltage is called back electromotive force (back EMF).

The inductance is represented by the symbol L and is measured in henry (H). The voltage across an inductor is given by:

This equation shows that the voltage induced in the inductor depends on how quickly the current changes. A faster change in current produces a higher induced voltage.

Inductance depends on several factors such as:

• Number of turns in the coil (more turns increase inductance)
• Core material (iron core increases inductance)
• Shape and size of the coil

Inductors are widely used in circuits for filtering, tuning, and energy storage purposes.

Energy Storage in Inductor

An important feature of an inductor is its ability to store energy in a magnetic field. When current flows through the inductor, energy is stored around the coil in the form of a magnetic field.

The amount of energy stored in an inductor is given by:

Where:

•  is energy stored
•  is inductance
•  is current

This equation shows that energy increases with both inductance and the square of current. So, even a small increase in current can store a large amount of energy.

When the current flowing through the inductor is reduced or suddenly stopped, the magnetic field collapses. As a result, the stored energy is released back into the circuit in the form of electrical energy. This is why inductors try to maintain the flow of current even when the power supply is removed.

This property of energy storage and release makes inductors very useful in many applications such as:

• Power supplies (to smooth current)
• Transformers (for energy transfer)
• Filters (to remove unwanted signals)
• Energy storage systems

Inductors also play a key role in switching circuits, where they store energy during one phase and release it during another phase.

Conclusion

Inductance is the property that opposes changes in current due to the formation of a magnetic field. An inductor stores energy in this magnetic field when current flows and releases it when the current changes. This ability makes inductors very important in electronic circuits, especially for energy storage, filtering, and signal control applications.