// Is energy stored in an inductor permanent or temporary ?

# Is energy stored in an inductor permanent or temporary ?

Energy stored in an inductor is temporary and occurs as a result of the magnetic field generated when an electrical current flows through the inductor. Inductors are passive electronic components that consist of a coil of wire, and they exhibit the property of inductance. The temporary storage of energy in an inductor is a fundamental principle in electrical engineering and is governed by Faraday’s law of electromagnetic induction.

1. Faraday’s Law of Electromagnetic Induction:

• Faraday’s law states that a change in magnetic flux through a coil induces an electromotive force (EMF) or voltage in the coil. The induced voltage is proportional to the rate of change of magnetic flux.
• When an electrical current flows through the coil, it creates a magnetic field around the coil. If the current changes, it induces a change in the magnetic flux, resulting in an induced voltage.

2. Energy Storage Process:

• When a voltage is applied across an inductor, and a current begins to flow through it, energy is stored in the magnetic field associated with the coil.
• The energy stored in the inductor is in the form of magnetic potential energy. This energy is proportional to the square of the current flowing through the inductor and the inductance of the coil.

3. Inductor’s Role in Circuits:

• Inductors are commonly used in electrical circuits for various purposes, such as energy storage, smoothing out voltage fluctuations, and creating time delays.
• In applications like DC-DC converters or transformers, inductors play a crucial role in transferring and storing energy in the form of magnetic fields.

4. Energy Release:

• The stored energy in an inductor is released when the current through the inductor changes. For example, if the current decreases, the magnetic field collapses, inducing a voltage that can drive a current in the opposite direction.

5. Inductor in AC Circuits:

• In AC (alternating current) circuits, where the current direction changes periodically, the energy storage and release in the inductor occur during each half-cycle. The inductor continuously alternates between storing and releasing energy.

6. Resistance and Energy Dissipation:

• In practical scenarios, the coil in an inductor also has resistance. Energy stored in the magnetic field is not entirely recovered during discharge due to resistive losses. Some energy is dissipated as heat in the inductor’s resistance.

7. Inductors in Energy Storage Devices:

• Inductors are not typically used as primary energy storage devices in the way batteries or capacitors are. Instead, they are components within circuits that facilitate energy transfer and transformation.

8. Applications of Inductors:

• Inductors find applications in various electronic devices and systems, including power supplies, transformers, inductance-based sensors, and radio frequency (RF) circuits.

Conclusion: Energy storage in an inductor is temporary and relies on the generation of a magnetic field when a current flows through the coil. The stored energy is released when the current changes, making inductors crucial components in electrical circuits for tasks like energy transfer and voltage regulation.