Transcript Energy

What do you think?

A light bulb is turned on. It produces
light and warms up. Which statement
is true?
• A. All the electrical energy is transformed to
light energy and heat energy.
• B. All the electrical energy is transformed to
light energy.
• C. Some of the electrical energy is transformed
to light energy and some is destroyed.
• D. All the electrical energy is transformed to
heat energy.
Energy
Mrs. Smith
Exists in 2
States
Energy - The ability to
do work or cause change.
Has several forms (or types)
Kinetic
- Energy
of Motion
-
Potential
- Stored
Energy
Can be Converted
but not destroyed
Law of Conservation
of Energy
Chemical
Nuclear
Electrical
Heat
Light
Sound
Can be Transformed or changed,
but not created or destroyed.
Law of Conservation of energy

What is the law of conservation of
energy?
Energy can not be created or
destroyed. It can only be
transferred or transformed.
Energy Transformations
What does it mean to “transform”
something?
What type of energy is this?

What is happening
to the energy?
Is it being created,
Destroyed or transformed




Chemical (battery)
Electrical (wire)
Light (light bulb)



As energy moves through a system it
can be transferred and/or
transformed.
Energy transformations involve the
energy changing into a new form
Example: the chemical in the battery
is transformed into the electrical in
the wire.
What happened to my energy?



Did my energy just disappear?
Energy can be changed from one
form to another.
When energy changes form, the
same amount of energy exists after
the change as there was before the
change

For example, the chemical energy in
a flashlight is transformed into
electrical energy and then light
energy

Starting energy is transformed to
final energy
Energy transformations

For example:
• When you ate breakfast this morning what
type of Energy were you consuming?
Starting Energy
Chemical
• What type of Energy did you then use in
order to leave your house (or the
Cafeteria)? Kinetic
Final Energy
• So, the energy transformation was:
•Chemical  Kinetic
One more example:

This summer, my friends drove by several
windmills on a trip out west (each windmill is about
as tall as a 30 story building). They are used as an
alternative energy source.
What type of Energy transformation is
taking place?
Kinetic (Wind)  Electrical

Stretching a slingshot and shooting a
water balloon
Potential  Kinetic
A. 2 step energy transfer

______________ (of the wind)
Kinetic Energy
_______________
( of the kite)
Kinetic Energy
B. 3 step energy transfer
__________ ( of the stove)
Heat Energy
___________
(of the pot)
Heat Energy
___________
( of the water)
 Heat Energy
A. 2 step energy transformation

______________ (of the lightning)
Heat Energy
Light Energy
_____________
and ____________
(fire)
Electrical Energy
B. 2 step energy transformation

Kinetic Energy
_____________ (of the skater)
Potential Energy
______________
(of the skater)
B
A
A. 2 step energy transformation
____________ ( of the ball)
Kinetic Energy
___________(
of the ball)

Potential Energy
B. 3 step energy transformation

Kinetic Energy
__________
( of the ball)
Potential Energy
___________
(of the ball)
Kinetic Energy
__________ (of the ball)

Which baseball(s) have the most
potential energy/ kinetic energy?
B
A
C
A. 2 step energy transformation

_____________ (of gasoline)
Kinetic Energy
______________
(of motion of car)
Chemical Energy
B. 2 step Energy transformation

____________ (of food)
Kinetic Energy
_______________
(of running)
Chemical Energy
A. 2 step energy transformation

Light Energy
______________ (of sun)
Chemical Energy
_____________
(of crops)
B. 2 step Energy
Transformation

_____________ (movement of
Light Energy
electrons) ____________
and
Heat Energy
___________
(of light bulb)
Electrical Energy
Electrons
Give one Get one
A. 4 step Energy Transformation

Chemical Energy
___________
(of battery)
Electrical Energy
___________
(of electrons)
Light Energy
______________
(of light bulb)
Heat Energy
_____________
(of light bulb)
4 step energy transformation

Potential Energy
_________ (of water)
Kinetic Energy
__________
(of water)
Kinetic Energy
Electrical Energy
_________
(of turbine) ________
(of generator)
5 step Energy transformation:
Nuclear Power Plant
Heat Energy
_________ (of atoms) to _________
Energy
(of water) to Kinetic
________
(of steam) to
Kinetic
Energy
Electrical Energy
________
(of turbine) to _______
(of generator)
 Nuclear Energy
4 step energy transformation
Light Energy
Chemical Energy
Chemical Energy
Kinetic
Energy