Home

Energiemenge

Energiemenge is a term used to denote the total quantity of energy contained in a system or available to perform work. In physics and engineering, it is treated as a scalar quantity that can take different forms, such as kinetic, potential, thermal, chemical, electrical, or nuclear energy. In an isolated system, energy is conserved, and the total Energiemenge remains constant, even as its form changes.

Units and measurement

The standard unit of Energiemenge is the joule (J). Larger amounts are commonly expressed in kilojoules (kJ)

Forms and decomposition

Kinetic energy depends on mass and velocity (1/2 m v^2). Potential energy arises from position in a

Applications and context

In engineering and science, Energiemenge is central to energy budgeting, propulsion, power generation, and efficiency analysis.

See also

Exergy, Enthalpy, Energy density, Energy conservation.

or
megajoules
(MJ);
for
very
large
scales,
gigajoules
(GJ)
or
terajoules
(TJ)
are
used.
In
practical
contexts,
electrical
energy
is
often
measured
in
kilowatt-hours
(kWh),
where
1
kWh
equals
3.6
MJ.
field,
such
as
gravitational
energy
m
g
h.
Internal
energy
encompasses
microscopic
motions
and
interactions
within
a
substance.
Chemical
energy
stores
energy
in
molecular
bonds,
while
electrical
energy
results
from
electric
fields.
The
Energiemenge
of
a
system
is
the
sum
of
these
contributions,
and
in
thermodynamics
it
is
related
to
work
and
heat
via
the
first
law
of
thermodynamics.
It
is
used
to
describe
the
energy
content
of
fuels,
the
capacity
of
batteries,
and
the
energy
performance
of
systems.
Distinctions
are
made
between
Energiemenge
and
exergy,
the
latter
representing
the
maximum
usable
work
obtainable
as
a
system
interacts
with
its
environment.