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henries

The henry (symbol H) is the SI unit of inductance. Inductance is a property of an electrical circuit that causes an electromotive force to be induced in proportion to the rate of change of current. The defining relation for an inductor with inductance L is ε = −L di/dt, where ε is the induced emf and di/dt is the rate of change of current.

By definition, 1 henry is the inductance of a circuit in which a current changing at 1

In practical terms, inductors with inductances ranging from microhenries to henries are used in a wide array

The henry is a derived SI unit, closely related to other electrical units through electromagnetic relationships,

ampere
per
second
induces
an
emf
of
1
volt.
In
base
units,
1
H
equals
1
kilogram
meter
squared
per
second
squared
per
ampere
squared
(kg·m^2·s^-2·A^-2).
The
unit
is
named
after
Joseph
Henry,
an
American
physicist
who
contributed
to
the
study
of
electromagnetism
in
the
19th
century.
The
name
was
adopted
into
the
metric
system
as
part
of
the
International
System
of
Units.
of
technologies,
including
filtering,
energy
storage,
and
impedance
matching
in
radio
frequency
circuits
and
power
supplies.
The
value
of
inductance
depends
on
the
geometry
of
the
conductor,
the
number
of
turns
in
a
coil,
and
the
magnetic
properties
of
surrounding
materials.
Common
prefixes
(millihenry,
microhenry,
nanohenry)
allow
convenient
expression
of
practical
values
across
electronic
applications.
and
is
fundamental
to
the
design
and
analysis
of
circuits
involving
time-varying
currents.