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Inductor S

The document provides an overview of inductors, which are passive two-terminal components that store energy in a magnetic field and oppose changes in current. It explains the principles of electromagnetic induction, the storage of energy in inductors, and their ability to block AC components in DC signals. Additionally, it discusses the relationship between varying electric currents and the magnetic fields they produce, highlighting the opposing currents generated within inductors.

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skgiridharansofdkumar
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11 views4 pages

Inductor S

The document provides an overview of inductors, which are passive two-terminal components that store energy in a magnetic field and oppose changes in current. It explains the principles of electromagnetic induction, the storage of energy in inductors, and their ability to block AC components in DC signals. Additionally, it discusses the relationship between varying electric currents and the magnetic fields they produce, highlighting the opposing currents generated within inductors.

Uploaded by

skgiridharansofdkumar
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Basic Electronics - Inductors


Let me introduce you to another important component in the field of Electronics and
Electricals, the Inductor. Inductor is a passive two-terminal component that temporarily
stores energy in the form of a magnetic field. It is usually called as a coil. The main
property of an inductor is that it opposes any change in current.

Inductor
According to the Faraday’s law of Electromagnetic induction, When the current flowing
through an inductor changes, the time-varying magnetic field induces a voltage in the
conductor. According to lens law, the direction of induced EMF opposes the change in
current that created it. Hence, induced EMF is opposite to the voltage applied across
the coil. This is the property of an inductor.

The following figure shows how an inductor looks like.

An inductor blocks any AC component present in a DC signal. The inductor is sometimes


wrapped upon a core, for example a ferrite core. It then looks as in the figure below.
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The following figure shows an inductor with various parts labelled.

Symbols

The symbols of various types of inductors are as given below.


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Storage of Energy

One of the Basic properties of electromagnetism is that the current when flows through
an inductor, a magnetic field gets created perpendicular to the current flow. This keeps
on building up. It gets stabilized at some point, which means that the inductance won’t
build up after that. When the current stops flowing, the magnetic field gets decreased.

This magnetic energy gets turned into electrical energy. Hence energy gets stored in this
temporarily in the form of magnetic field.

Working of an Inductor
According to the theory of Electromagnetic Induction, any varying electric current,
flowing in a conductor, produces a magnetic field around that, which is perpendicular to
the current. Also, any varying magnetic field, produces current in the conductor present
in that field, whereas the current is perpendicular to the magnetic field.

Now, if we consider an inductor which is made up of a conducting coil and when some
current passes through the inductor, a magnetic field is created perpendicular to it. The
following figure indicates an inductor with magnetic field around it.
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Now, here we have a varying magnetic field, which creates some current through the
conductor. But this current is produced such that it opposes the main current, which has
produced the magnetic field.

If this current is named as Im which means the current produced due to the magnetic
field and the magnetic field is indicated by β, the following figure indicates it.

This opposing current gains strength with the varying magnetic field, which gains energy
by the input supply frequency. Hence as the input current becomes more and more AC
with high frequency, the resulting opposing current also gains its strength in opposite
direction to the very cause producing it. Now, this opposing current, tries to stop the
high frequency AC to pass through the inductor, which means “blocking of AC”.

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