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joules
Definitions
1
noun
A
unit
of
energy
in
the
International
System
of
Units
(
SI
),
equivalent
to
the
energy
transferred
when
a
force
of
one
newton
is
applied
over
a
distance
of
one
meter
.
The
light
bulb
uses
joules
of
energy
per
second
.
The
battery
can
store
up
to
joules
.
Running
up
the
stairs
requires
about
joules
of
energy
.
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Word Origin
Language
English
Originally meant
A unit of energy
Background
Named after James Prescott Joule, a physicist who studied the nature of heat and its relationship to mechanical work in the 19th century.