What does inductor mean?
An inductor is chiefly an electrical component that stores energy in a magnetic field. It is usually made from a coil of insulated wire, often wound around a ferromagnetic core, and is used in power supplies, filters, transformers, motors, and countless electronic circuits. Its characteristic behavior is to resist changes in the current passing through it, allowing it to smooth and regulate electrical signals. The term also has a specialized mathematical meaning: a linear map that preserves the addition of vectors and multiplication by scalar numbers, also known as a linear operator. This mathematical sense is unrelated to electronics but derives from the broader idea of inducing or establishing a relationship. In everyday technical writing, “inductor” almost always refers to the electrical component. It should not be confused with a solenoid, which is a more specific electromechanical device, or with a conductor, which carries current rather than storing energy in a magnetic field.
A passive electrical component that stores energy in a magnetic field, generally in the form of a coil wound around a core.
"The inductor prevents the current from changing too abruptly."
Common types include power inductors, audio inductors, and radio-frequency inductors.
In mathematics, a linear map on a vector space, equivalently an endomorphism that preserves addition and scalar multiplication.
"The matrix represents an inductor on a finite-dimensional vector space."
This sense is specialized and is most often encountered in linear algebra and operator theory.
The plural is used when referring to multiple electrical components or mathematical linear maps.
"The manufacturer produces inductors for use in high-frequency power converters."
An inductor stores energy without consuming it, turning a magnetic field into a component that can reshape an electrical circuit.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does inductor come from?
The word was formed in the 19th century from Latin inducere, meaning “to lead in” or “bring in,” a derivative of ducere, “to lead.” In electrical terminology, the name reflects the component's ability to produce or induce a magnetic field. The later mathematical sense uses “inductor” for a map that establishes or preserves linear relationships.
Related word forms
How inductor is actually used
In electrical engineering, the term usually denotes a passive component used to oppose changes in current, store magnetic energy, or filter signals. The mathematical sense is specialized and is most common in abstract algebra and operator theory.
Easily confused with inductor
A solenoid is specifically an electromagnetic device with a coil and movable plunger, whereas an inductor is the broader category of component that stores energy in a magnetic field.
A conductor carries electric current, while an inductor stores energy in a magnetic field and opposes changes in current.