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Energy
A physical quantity that can be
stored
and
transferred
SI unit of energy
Joule
(J)
An energy system consists of
different
energy stores
interacting
together
Energy is a
non-physical
and
invisible
substance that can be transferred from one energy store to another
The total amount of
energy
in an
isolated
system is
constant
Energy can be transferred in 4 main ways: mechanically, by
waves
, electrically, and by
heating
SI unit of work
Joule
(
J
)
Work done is
equal
to the
energy
transferred
Power
The rate of
work
done
or
energy
transferred
per unit time
SI unit of power
Watt
(
W
)
