1. Energy
It’s many types:

2. What is Energy?
 Energy is the ability to do work!!!

3. What are the different types?
 Mechanical energy: Energy of motion
that can do the work mechanically , like
wind turning a windmill, waterfalls, and
tides.
 Two types of mechanical are kinetic and
potential!

4. Types of energy cont.
 Heat energy (thermal ): Where motion or
rise in temperature is caused by heat, like
a fire in a fireplace, due to the effect of
moving molecules.

5. Types of energy cont.
 Chemical energy: Is the chemical reaction
causing changes; food, fuel, explosives all
store chemical energy. This energy can be
converted into other forms of energy like
heat and light

6. Types of energy cont.
 Electrical Energy: This is when motion,
light, or heat is produced by an electrical
current like the electric coils in your stove.
It is really the effect of moving electrical
charges from one point to another
through a conductor called electricity.

7. Types of energy cont.
 Gravitational energy: This is where
motion, like water going over a dam, is
caused by the pull of gravity.

8. Types of energy cont.
 Light energy: This type of energy is a type of
wave motion, meaning that light is a form of
energy caused by light waves. It enables us
to see, as objects are only visible when they
reflect light into our eyes. Ex. Radio and t.v.
waves, gamma and x-rays

9. Types of energy cont.
 Sound energy: This is also a type of wave
motion. We are heard by others when we
talk because of the sound energy we
produce. This is due to the effect of the
air molecules vibrating when we talk. The
vibrating molecules hit our eardrums,
which allow us to hear others talk.

10. Types of energy cont.
 Nuclear Energy: Also called Atomic
Energy. This energy is stored in the
nucleus of an atom. Can be used to
generate electricity in nuclear power
plants, produce steam for driving
machines, powering some submarines
and spacecrafts. It is also the source of
the sun’s energy…when the sun combines
the nuclei of hyrogen atoms into helium
atoms in a process called fusion.

11. Energy conversions:
 When energy is used, it’s changed from
one form to another.
 During any energy conversion, the
amount of energy input is the same as the
energy output.
 This is known as the law of conservation of
energy.

12.  The law states: Energy cannot be
created or destroyed BUT can be
CHANGED from one form to another.

13.  Example:
When we turn on a flashlight….
The chemical energy stored in the batteries
is changed ( converted ) into light energy.
When we turn on the t.v……electrical
energy changes into light energy and
sound energy. Even though undesirable,
some amount of heat is also produced.

14. When we move a vehicle….the engine
converts the chemical energy stored in the
fuel as heat, sound and kinetic energy,
although the heat and the sound that are
produced are not desirable.

15.  We are greatly dependent upon energy.
 We have several forms of natural energy
to help us live productively here on earth.
 It is up to us to learn how to use the
different forms of energy in creative ways.