Inductors are the passive electronic elements that resist the inflow change in the incoming current and store energy in form of magnetic field.

1. Everything you need to know about Inductors
Inductors are the passive electronic elements that resist the inflow
change in the incoming current and store energy in form of magnetic
field. It is quite easy to recognize any inductor as they are shaped like
a coil which resembles a spring and engineers take the benefit of it
magnetic property of the element from which it is made. Generally you
will see maximum number of inductors is made from copper. The
capacity of any inductor is known as inductance and inductance
depends upon the no. of coils, diameter of inductor and material used.
How inductor works efficiently and is used in many appliances we need
to first learn about inductance. Inductance is the capacity of any
inductor and is conveyed in henries unit and any inductance results
from the magnetic flux which has been created around the conductor.
When current is passed through the conductor it creates a magnetic
flux.
So the definition becomes inductance (L) of any inductors is
determined by the value of magnetic flux (φ) which is created in a
circuit by the current (i).
L = φ
÷i
Inside of Inductors-
Basic structure of any inductor is quite simple and easy to understand.
Generally it has a coil of conducting material, which could be a
insulated copper wire wrapped around a core material. This core
material could be plastic, ferromagnetic material and ferromagnetic
material etc. This ferromagnetic and ferromagnetic material has high
permeability (property of any material to support high
electromagnetism). Such property increases the inductance of any
core and helps in getting maximum resistance.

2. Types of inductors-
Inductors come in multiple types and sizes as per the application of
them. They vary in size and wirings. Type also depends upon the
material of the coil and how many loops they have used on it.
If we just talk about the standard type of any inductor then we will get
to know that there is only two types of inductors are there: one is
fixed inductors and other is variable inductor. So let’s talk about
various types of inductors-
1. Iron core inductor (ferromagnetic inductors)
As the name suggests iron core inductor has iron in the core to
increase the inductance and because iron metal has greater
permeability than other metals. It is used at those places which
required lower resistance and higher inductance like transformers
and bigger and heavy machineries. However, there are some
disadvantages are also associated with it like due to higher
inductance to a longer period of time the behavior of metal could
be changed and it would need a replacement.
2. Air core inductor-
In air core inductor there is no metal used in place of core
material this term is only used for nonferromagnetic items like
plastic, ceramic or just air in the space of windings. Air core is
lesser inductance than ferromagnetic materials and they could be
used for higher frequencies too because they do not have
limitations like other core materials which is called “core loss”
within increasing frequencies. A problem with air core inductor is
that if there are many mechanical vibrations in the system then
the desired inductance could be different.
3. Laminated core inductor-
Some inductors which need low inductance are made from
laminated core materials which are a number of laminated sheets
which are covered with an insulation material on the outside. It is
used to decrease the eddy effect (looping in electric field due to
change in magnetic effect).