
25-1
Energy is one of the most important physical quantities in any branch of science and engineering and
es
pecially
in el
ectrical
en
gineering
. En
ergy
ex
change
pr
ocesses
le
ad
to th
e
st
udy
of el
ectric
ne
tworks
fr
om
th
e
ph
ysical
po
int
of vi
ew
an
d
al
low
an in
-depth
kn
owledge
of po
wer
tr
ansfer
wi
thin
th
e
el
ectrical
wo
rld
a
nd
b
etween
e
lectric
a
nd
o
ther
f
orms
o
f
e
nergy
.
e d
enitions
o
f
e
nergy
a
nd
p
ower
r
epresent
t
he
s
tarting
p
oint
f
or
a
ny
s
uccessive
s
tudy:
1. En
ergy
i
s
t
he
a
mount
o
f
w
ork
t
hat
t
he
s
ystem
i
s
c
apable
o
f
d
oing
.
2. Power is the time rate of doing work.
Energy can be mathematically dened as the denite integral of the power over a given ...