ENERGY

1. ENERGY Energy Forms, Conversion, Resources and Conservation

2. ENERGY - the ability to do work • Energy is known by the changes it causes

3. WORK - when a force moves an object through a distance • Transfer of energy • Measured in Joules

4. TYPES OF ENERGY • Kinetic Energy - energy of motion • Depends on an objects MASS and SPEED

5. TYPES OF ENERGY • Potential Energy - stored energy due to position or shape • Depends on an objects MASS and POSITION

6. TYPES OF POTENTIAL ENERGY • Gravitational Potential Energy – energy that depends on HEIGHT, MASS & ACCELERATION due to gravity

7. TYPES OF POTENTIAL ENERGY • Elastic Potential Energy - energy that depends on how much an object is STRETCHED or COMPRESSED

8. FORMS OF ENERGY • Mechanical – energy of motion & position • Thermal – energy of microscopic particles • Chemical – energy stored in chemical bonds

9. FORMS OF ENERGY • Electrical – energy associated with electric charges • Electromagnetic – energy that travels in waves • Nuclear – energy stored in atomic nuclei

10. FORMS OF ENERGY Is the energy staying in the same form in each of these pictures?

11. ENERGY CONVERSION - process of converting energy from one form to another Name some energy conversions

12. Is any energy LOST in the conversions?

13. LAW OF CONSERVATIONOF ENERGY - states that energy CANNOT be created nor destroyed(can only be converted) BEGINNING E = ENDING E

14. LAW OF CONSERVATIONOF ENERGY • Albert Einstein– famous scientist to theorize that energy & mass are equal • He also theorized that energy & mass can be converted into one another E = mc2 (theory of relativity)

15. TYPES OF ENERGY RESOURCES • Nonrenewable – exist in limited quantities & cannot be replaced (except over millions of years) • creates pollution • ie. fossil fuels (oil, natural gas, coal) & uranium

16. TYPES OF ENERGY RESOURCES • Renewable – can be replaced in a short period of time • creates very little/no pollution • ie. hydroelectric, solar, geothermal, biomass, nuclear fusion & wind

17. RENEWABLE ENERGY RESOURCES • Hydroelectric – energy obtained by flowing water • Gravitational PE  Kinetic E • Water turns turbines connected to generators • Pros- low cost & no pollution • Cons - hampers fish spawning, requires lots of land & disrupts animal habitats

19. RENEWABLE ENERGY RESOURCES • Solar – sunlight converted into usable energy • Uses panels or photovoltaic (PV) cells • Pros - no pollution • Cons - high cost & climate dependent • Geothermal – thermal energy beneath Earth’s surface • Pumps water into ground which turns into steam & drives generators • Pros – no pollution • Cons – not widely available

21. RENEWABLE ENERGY RESOURCES • Biomass – energy stored in living things • Burning wood, garbage & crops • Creation of biofuels • Pros – never ending supply • Cons – some pollution • Nuclear fusion – fusion of hydrogen atoms • Pros – little waste & no pollution • Cons – technology not advanced enough

23. RENEWABLE ENERGY RESOURCES • Wind – horizontal movement of air turns turbines which turns a generator & creates electricity • Pros – no pollution • Cons – need wind, eye sore & requires lots of land

25. ENERGY CONSERVATION – finding ways to use less energy or use energy more efficiently • ie. Turn off lights, carpool, energy efficient appliances & light bulbs • Can you think of other ways to conserve energy?

26. WORKS CITED • users.tpg.com.au • tiki.oneworld.net • www.naseg.co.uk • www.lpea.com • espn.go.com • www.hsdejong.nl • techalive.mtu.edu • www.phschool.com • www.flickr.com • www.helixcharter.net • www.maltaconference.com • ffden-2.phys.uaf.edu • www.danishexporters.dk • www.efluids.com • www.edha.co.uk • www.free-graphics.com