What
is an Inductor?
An inductor is
the magnetic analogue of an electrical capacitor.
-
Inductance is defined as the property
of a coil (consisting of multiple turns
of wire wound in a helical geometry
around a core) to store magnetic energy,
induce a voltage in itself, and oppose
changes in current flowing through it.
-
An ideal inductor is a coil wound
with resistance less wire.
-
It is symbolized by L.
What is the Unit
of the Inductor?
-
The inductance is measured in henrys
(H).
-
It was named after the American inventor
JOSEPH
HENRY who along with the English
experimentalist MICHAEL
FARADAY discovered almost simultaneously
that a changing magnetic field could
induce a voltage in a neighboring circuit.
They showed that this voltage was proportional
to the time rate of change of the flux O,
so the total voltage v across N turns is
Faraday, Ampere, and Oersted
developed the concept of magnetic flux ?
associated with the current in the inductor
where L
is the constant of proportionality, substituting
the above equation into the previous one,
we obtain
Where v
and I
are both functions of time. The inductor
whose inductance is defined in the above
equation is a mathematical model. It is
an ideal element, which we may use to approximate
the behavior of a real device. A physical
inductor may be constructed by winding a
length of wire into a coil.
|
