Inductor - Electrical C & V


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22 February 2020


What is an Inductor?

Inductor is an important component in electronics circuits. You will find this comfortable in every type of electronics device. Coils are also used for filtration, boosting and sorting of signals and more. In this post, you will get to know about the Inductor.



What is Coil OR Inductor?

In reality, a coil is a wire. Which can be of any conductive material like: copper, aluminum, iron etc. When malformed material is placed around this wire. (This is called insulation.) And if it is wrapped round with no base or base, then the parts made of this type are called Coil. The insulation is applied so that the wire does not shorten when it is wrapped. The current is received from the end of the wire only from the other end and not in the middle.



What is Core?

When a coil is made, it is wrapped on a conductive metal, then called Core. Wrapped on the basis of iron or ferrite, it is called ferrite core or iron core, if the wire is wrapped without any core or conductor, it is called air core.

How does the Inductor (Coil) work?

When AC (variable current) is given to a coil, voltages of polarity are produced as opposed to the supply in the coil. These resist the supply supplied in the voltage coil.


To put it simply: On giving AC volts to the insulated wire, a magnetic field is formed around the wire in which two poles of the magnet become North pole and South pole. When we wrap the wire, these pols oppose each other. This is the quality of the coil due to which opposing volts are generated. This is called Inductance. It is measured by Henry.

1 H → 1000 mH
1 H → 1000000 microHenry (uH)


The inductance of the coil will be higher if the wrapping of the coil is more, similarly if the wrap is less then the inductance will also be less. It means to say → As the inductance increases, the coil will pass at a lower frequency. If the inductance is low then it will pass the high frequency.
The inductance of the coil is affected according to the thickness, length, and area of ​​the wire. Wrapping, thickness and area increase the inductance of Coil.

Types of Inductor

 Inductors are of many types, all of them have different uses, some also have size, inductance value etc. Is made keeping in mind some type of Inductor is below:-

1. Air Core Inductor
2. Iron Core Inductor
3. Ferrite Core Inductor
4. Toroidal Core Inductor
5. Variable Inductor
6. Laminated-core Inductor
7. Bobbin based Inductor
8. Multi Layer Inductor
9. Film Inductor

1. Air Core Inductor

In this type of Inductor, the core is absent, the core only contains air, there is a wound on a material like Coil plastic or ceramic, there is no core loss in it.

2. Iron Core Inductor

This type of Inductor have very low inductance but at high frequency these inductors cause eddy current i.e. loss of current. These are Inductors of fixed value.

3. Ferrite Core Inductor

Ferrite Core Inductors types of ferromagnetic material. Soft Ferrite and hard Ferrite are wrapped with wire or coil. Ferrite Core Inductor is less expensive and core loss is also less at high frequency.

4. Bobbin Inductor

The coil in the Bobbin Inductor types Inductor is wrapped on a cylindrical Bobbin. This type of Inductor is mounted on the printed circuit board. You must have seen these designs are designed keeping in mind the power rating, voltage and current levels, operating frequency, etc.

5. Toroidal Core Inductor

A special type winding machine wraps around it. There is very little flux leakage in this type of Inductor.

6. Variable Inductor

This type whose inductance value can be adjusted or we can reduce the inductance value, they must be seen in our radio, they are used in high frequency applications.

7. Laminated-core Inductor

The core of the Inductor of laminated-core Inductor types is made by adding thin metal leaves, these leaves are added parallel to reduce eddy currunt loss as the coil or Inductor in the transformers.

8. Multi Layer Inductors

This type of Inductor has more than one layer of coils which is separated by an insulate material. These types of Inductor use mobile communication systems and noise suppression applications.

9. Film Inductor

This type of Inductor is made by mixing very small Inductors, they are like a chip, are used in high-frequency applications mobile devices and are used in dc to dc converter.

Testing of coil

And it is measured with a particular type of multi-meter, it is called LCR meter.

Use of Coil

Coil is used to sort the frequencies. By this the radio wave or signal is too much to fall and leave.
Mobile towers, radio towers are examples of this.

Coil is used to make electricity. Or simply saying that without coils, electricity cannot be created, it will not be wrong. Because dynamos from which electricity is made use only Coil.


What is Resistor:-  Click Here
What is Capacitor:- Click Here

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