Transcript All About Energy Powerpoint

All about Energy
The Big Ideas!
• Energy exists in different forms
• Energy can change forms but is
never lost
• Technology improves the ways
people use energy
Different Forms of Energy
have different uses.
• Almost everything occurring around
you involves energy.
• All forms of energy have one
important point in common---they
cause changes to occur.
• Energy: is the ability to cause
change or do work.
Forms of Energy
•
•
•
•
•
•
Mechanical
Sound
Chemical
Thermal
Electromagnetic
Nuclear
Exploring the Forms of
Energy
• Mechanical Energy: the energy
that moves objects
Exploring the Forms of
Energy
• Sound Energy: energy from the
vibration of particles in a solid, liquid,
or gas
Exploring the Forms of
Energy
• Chemical Energy: energy that is stored
in the chemical composition of matter.
Exploring the Forms of
Energy
• Thermal Energy: the total amount of
energy from the movement of
particles in matter.
Exploring the Forms of
Energy
• Electromagnetic Energy: energy
transmitted through space in the form of
electromagnetic waves. (visible light, xrays, microwaves)
Exploring the Forms of
Energy
• Nuclear energy: the source of nuclear
energy is the nucleus
Kinetic versus Potential
Energy
• Kinetic energy: the energy of motion
• Kinetic energy INCREASES as mass
INCREASES
• Kinetic energy INCREASES as speed
INCREASES
Kinetic versus Potential
Energy
• Potential energy: the stored energy that
an object has due to its position or
chemical composition.
Energy can change
forms but is never lost!
Energy can change
forms but is never lost!
• Potential energy is stored in chemicals
on the head of a match. The flame of
the burning match releases that energy
as light and heat.
Using Energy
Conversions
Converting Energy in a Dam
1. Water held behind the dam has potential
energy
2. Potential energy is converted to kinetic
energy when the water moves through
the tunnel
3. Kinetic energy is used to turn turbines.
This mechanical energy is converted
into electrical energy by generators.
4. Electrical energy is transmitted through
the wires, and then converted into
many forms of energy
Law of Conservation of
Energy!
• States that energy can neither be
created nor destroyed.
• Energy changes form
Energy Efficiency
• A measurement
of usable energy
after an energy
conversion.
• Energy-efficient
household
appliances.
Technology improves the
use of energy resources.
Solar Cells: made of several layers of
light-sensitive materials, which convert
sunlight directly into electrical energy.
Technology improves the
ways people use energy!
• Efficient lights
• Efficient cars
• Solar energy
• Wind energy