The
energy
to
generate
electricity
comes
from
different
sources
:
f
____________________
f
____________________
,
s
____________________
,
w
____________________
,
w
____________________
,
b
____________________
and
even
n
____________________
p
____________________
s
____________________
.
Electricity
can
be
used
to
power
machines
and
we
can
use
it
to
transform
it
into
h
____________________
,
s
____________________
,
l
____________________
and
m
____________________
.
