An inductor is a passive electronic component that stores energy in the form of a magnetic field. It typically consists of a coil of conducting wire, like copper, wound around a core material. When electric current flows through the coil, it generates a magnetic field, which opposes changes in current and can also transfer energy to adjacent circuits through magnetic coupling.


The phonetics of the keyword “Inductor” can be represented as: /ɪnˈdʌktər/ Here’s a breakdown of the pronunciation:- /ɪ/: Short “i” sound, like in “bit” or “sit”- /n/: “n” sound, as in “net” or “not”- /ˈdʌ/: Stressed “u” sound (like ‘uh’), as in “dust” or “hut”- /k/: “k” sound, as in “cake” or “kick”- /t/: “t” sound, as in “top” or “bet”- /ə/: Schwa sound (neutral vowel sound), similar to ‘uh’- /r/: “r” sound, as in “red” or “car”

Key Takeaways

  1. An inductor is a passive electronic component that stores energy in the form of a magnetic field when an electric current flows through it.
  2. Inductors have the ability to oppose a change in current and are used in filters, transformers, and energy storage devices in various electronic circuits.
  3. The amount of inductance in an inductor is dependent on the number of turns of wire, the wire spacing, the core material, and the overall shape and size of the coil.


The technology term “inductor” is important because it plays a crucial role in various electronic and electrical systems, influencing their performance, stability, and efficiency.

An inductor is a passive electronic component that stores energy in its magnetic field, typically consisting of a coil of wire wound around a core material.

When current passes through the coil, it creates a magnetic field that resists changes in the current, making it useful in filtering circuits, voltage regulation, and energy storage.

Inductors are widely used in power supplies, transformers, radiofrequency devices, and communication systems.

Their ability to deliver power without direct contact, help reduce noise and interference, and shape frequency response makes them indispensable in modern electronics, communications, and renewable energy systems.


Inductors serve essential roles in various applications within the realm of technology, predominantly in the electrical and electronic domain. These passive electronic components are specifically designed to store energy in the form of a magnetic field, while opposing changes to the current passing through it.

Fundamental in the development of several electronic devices, inductors are invaluable for their ability to assist in filtering, energy storage, and signal processing. Among their myriad applications, they can be found in power supplies, transformers, and radio frequency circuits, to name a few.

One of an inductor’s primary purposes is to manage the flow of electric current effectively in numerous scenarios, which consequently protects the functionality and longevity of the electronic device it is integrated into. Notably, inductors operate as vital components in filter circuits, where they are incorporated alongside capacitors to dampen unwanted frequency components, reducing noise or interference.

Additionally, inductors are instrumental in a broad range of power electronic systems to store energy during transient periods and help in smoothing voltage variations, preventing potential system damage. From fine-tuning telecommunication technology to safeguarding computers and other electronic devices, inductors provide a robust and indispensable measure to help maintain overall system stability and efficiency.

Examples of Inductor

Power Supply Filtering in Electronic Devices: Inductors play an essential role in smoothing out the voltage across an electronic circuit, helping to eliminate noise and voltage fluctuations. This ensures that devices like computers, smartphones, and televisions receive a reliable and steady flow of power, preventing performance issues and hardware damage.

Wireless Charging Systems: In inductive coupling wireless charging systems, such as those used for electric toothbrushes, smartphones, or electric vehicles, an inductor coil in the transmission pad generates an alternating magnetic field in response to an AC current flowing through it. Nearby, a second inductor coil in the receiving device picks up this magnetic field and converts it back into an electric current, charging the device’s battery wirelessly.

Induction Cooking: Induction cooktops utilize the principle of induction for cooking. In this technology, an inductor coil beneath the cooking surface generates a high-frequency alternating magnetic field. When a pan with a magnetic base (such as cast iron or stainless steel) is placed on the induction cooktop, the magnetic field induces eddy currents in the pan, which in turn generate heat, allowing for efficient and precise cooking.

FAQ about Inductor

What is an inductor?

An inductor is a passive electronic component that stores energy in the form of a magnetic field. It typically consists of a coil of wire wound around a core made of magnetic material or air. When an electric current flows through the coil, it creates a magnetic field around it, which in turn opposes any changes in the current.

What are the units of measurement for inductance?

The unit of measurement for inductance is Henry (H). Smaller units such as millihenry (mH) or microhenry (μH) are commonly used in electronics as well.

How do inductors work in a circuit?

Inductors work in a circuit by opposing any change in the current flowing through them. They do this by storing energy in their magnetic fields when the current changes. When the current is increasing, the magnetic field builds up and resists the change; when the current is decreasing, the stored energy is released back into the circuit. This behavior makes inductors useful for filtering and storing energy in applications such as power supplies and resonant circuits.

What are some common applications of inductors?

Inductors are widely used in electronic circuits for various purposes, including filtering high-frequency noise in power supplies, tuning radiofrequency circuits, energy storage in switching power supplies, and impedance matching in transmission lines. They can also be found in transformers, inductively coupled circuits, and electromechanical devices like motors and solenoids.

How are inductors different from capacitors?

Though both inductors and capacitors are passive components that store energy, they do so in different ways. Inductors store energy in the form of magnetic fields, whereas capacitors store energy in the form of electric fields between charged plates. In a circuit, inductors oppose changes in current while capacitors oppose changes in voltage. Inductors are used in applications where energy storage in magnetic fields is required, while capacitors are used in applications where energy storage in electric fields is needed.

Related Technology Terms

  • Magnetic Field
  • Coil
  • Electromagnetic Induction
  • Reactance
  • Inductance

Sources for More Information


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