Figure 5
o
Energy Conversions
in a Hair Dryer
Electrical energy
enters the hair
dryer and is
converted into,
kinetic energy as
a small electric
motor spins a
fan blade.
6
Electriczl ~:::'""'.'
is also co;na:"tOO
e
into u ••:"••.•::;..
ene
of . es
heats
The fan forces air
across the hot wires,
and hot air blows out
of the nozzle of the
hair dryer. You can
hear the sound energy
that also comes out.
Why Energy Conversions Are Important
Energy conversions are needed for everything we do. Heatine
our homes, getting energy from a meal, and man other thinzs
use energy conversions. Machines, such as the hair dryer sho
in Figure 5, help convert energy and make that enen!Y ·0 . - ~
you. Electrical energy by itself won't dry our hair. But j
use a hair dryer to convert electrical enerl!) into the LLH....u.:.=
energy that helps you dry your hair,
Conversions Involving Eledrica
You use electrical energy all of the time.
the radio, when you make toast, and s rhen _
with a camera, you use electrical energy. iledtri4:a:
easily be changed into other forms of enen!Y.
common energy conversions that involve electrical
T
"
~,;:::;n]"-
Eledrical
.
Alarm clock
electrical energy ~
light energy a
sound energy
Battery
chemical energy ~
electrical energy
Light bulb
electrical energy ~
light energy and thermal energy
Blender
electrical energy ~
kinetic energy and sound energy
Section 2 Energy Conversions
357