An inductor is a two-terminal electrical tool which stores energy in a magnetic field generated by the current passing through it. The inductor is a very important electrical gadget for every electrical machine and appliance. This article brings a complete description of an inductor, its types, formulation and mechanism of working. 


Inductor is an electrical component that stores energy in magnetic field.

The inductor is made of a coil of conducting wire.

In an electrical circuit schematics, the inductor marked with the letter L.

The inductance is measured in units of Henry .

Inductor reduce current in AC circuits and short circuit in DC circuits.

Inductor picture

Inductor symbols

Iron core inductor
Variable inductor

Inductors in series

For several inductors in series the total equivalent inductance is:

LTotal = L1+L2+L3+...

Inductors in parallel

For several inductors in parallel the total equivalent inductance is:


Inductor's voltage


Inductor's current


Energy of inductor


AC circuits

Inductor's reactance

XL = ωL

Inductor's impedance

Cartesian form:

ZL = jXL = jωL

Polar form:

ZL = XL∠90º

Types of Inductors

There is a huge variety of inductors available and these inductors are classified into different types on different bases but here we will put a glance at three of its basic types which are categorized on the basis of the manufacturing material of inductors. These are:


  • Iron core inductors- these have iron as a core material as the name suggests.
  • Iron powder core inductors- these inductors have a core material of iron powder which is cheap as well as very effective inductive properties. But one should not use these inductors for main switches & transformers.
  • Air core Inductors- these inductors use air as the core. This air is present within the coil. 
What is an inductor used for?

Inductors are usually utilized for batteries for energy in switched mode power systems to generate DC voltage. Inductors, which store energy, provides energy to the circuit in order to ensure that current flow is maintained through "off" period of switching and thus allows topographies to be created when output voltage is greater than input voltage.

See also

Write how to improve this page

Follow Us