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Energy and Energy Resources

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Energy and Energy Resources Carin Miranda Smyrna Middle School Fall 2009 What is Energy? Energy is the ability to do work. Energy is expressed in joules (J). – PowerPoint PPT presentation

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Title: Energy and Energy Resources


1
Energy and Energy Resources
  • Carin Miranda
  • Smyrna Middle School
  • Fall 2009

2
What is Energy?
  • Energy is the ability to do work.
  • Energy is expressed in joules (J).

3
Kinetic Energy
  • Kinetic Energy is the energy of motion.
  • Kinetic Energy mv2 / 2

4
Potential Energy
  • The Energy an object has based on shape or
    position.
  • Elastic potential energy
  • When you change the shape of something
  • Gravitational potential energy
  • The higher something is off the ground the higher
    its potential energy. The more it weighs the
    higher its potential energy as well. Depends on
    height and weight.
  • Chemical potential energy
  • The food you eat is stored as chemical potential
    energy

5
Mechanical Energy
  • Is the total amount of energy in a system.
  • Mechanical energy potential energy kinetic
    energy
  • As kinetic energy goes up potential goes down and
    vice verse.

6
Other Forms of Energy
  • Thermal
  • Chemical
  • Electrical
  • Sound
  • Light
  • Nuclear

7
Thermal Energy
  • Heat
  • Higher the temperature the faster the molecules
    move
  • The more you have of a substance the more thermal
    energy you have.

8
Chemical Energy
  • Food you eat
  • Batteries
  • Anytime you have something breaking down and it
    creates a new object.

9
Electrical Energy
  • Moving electrons
  • Anything you plug in.
  • Batteries start as chemical energy but it is
    converted into electrical energy.

10
Sound energy
  • Caused by an objects vibrations
  • Anything you hear

11
Light Energy
  • Vibrations of electrically charged particles
  • Anything you see.
  • Waves that you cant see
  • Radio, Gamma, ultraviolet, microwaves

12
Nuclear Energy
  • When two atoms fuse together(fusion) or split
    apart (fission)
  • Fusion happens in the sun
  • Fission happens when uranium is split to produce
    electrical energy

13
Energy Conversions
  • A change from one form of energy to another.
  • Any form of energy can be converted into any
    other form of energy.

14
Energy Conversions in Plants
  • The nuclear energy of the sun produces light and
    thermal energy.
  • The light energy from the sun is converted by
    plants into chemical energy which is stored in
    the foods we eat.

15
Conservation of Energy
  • Roller Coaster- Highest potential energy is at
    the top of the biggest hill. Highest kinetic
    energy is at the bottom of the biggest hill.

16
Law of Conservation of Energy
  • Energy can never be created nor destroyed.
  • It can only be transferred or converted.
  • In every energy conversion some thermal energy is
    given off due to friction.
  • This means that there is no such thing as a
    perpetual motion machine.

17
Energy Efficient?
  • The amount of energy available before a
    conversion compared to the amount of useful
    energy after a conversion.

18
Energy Resources
  • A natural resource that can be converted into
    other forms of energy
  • Nonrenewable
  • Cannot be replaced or are replaced at a slower
    rate than we are using it.
  • Renewable
  • Can easily be replaced.

19
Nonrenewable Resources
  • Fossil Fuels
  • Includes coal, natural gas, petroleum.
  • Most coal is used to generate electrical energy.
  • Nuclear Energy
  • Uranium 1 uranium 1 metric ton of coal.

20
Renewable
  • Solar
  • Water (Hydroelectric)
  • Wind
  • Geothermal (hot water under ground)
  • Biomass (trash)

21
Advantages vs. Disadvantages
  • Know all the advantages and Disadvantages of the
    Energy Resources on Page 368
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