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Coil

A coil is a wound conductor or a helical structure used in a range of technologies. In electronics it typically refers to an inductor, whereas in mechanics a coil may describe a coil spring used to store energy or provide deflection force.

Electrical coils operate by passing current through a wire wound into turns. The resulting magnetic field enables

Construction and materials commonly involve enamel-insulated copper or aluminum wire wound on a form or core

Mechanical coils include coil springs, which store elastic energy and provide force or displacement in mechanical

See also: Inductor, transformer, electromagnet, coil spring, solenoid.

inductors
to
oppose
changes
in
current
and
to
store
energy,
with
the
energy
given
by
E
=
1/2
L
I^2,
where
L
is
the
inductance.
Inductors
come
in
air-core
forms
or
with
ferromagnetic
or
ferrite
cores
to
increase
inductance.
Coil
geometry,
including
the
number
of
turns
N,
cross-sectional
area
A,
length
l,
and
the
core
material,
determines
inductance.
Toroidal,
solenoidal,
and
U-shaped
coils
are
common
configurations.
made
of
ferrite,
powdered
iron,
laminated
steel,
or
left
air-filled.
Insulation,
winding
tightness,
and
thermal
management
are
important
for
performance
and
reliability,
especially
in
high-power
or
high-frequency
applications.
Coils
are
integral
to
transformers,
inductors,
chokes,
electromagnets,
relay
coils,
and
the
windings
of
motors
and
generators.
systems.
Springs
vary
by
material,
wire
diameter,
coil
pitch,
and
diameter,
shaping
their
stiffness
and
load
capacity.