Do Now page 109. Read page 515 in textbook and answer The Big Question. You must use evidence from the text.

Transcription

1 Do Now page 109 Read page 515 in textbook and answer The Big Question. You must use evidence from the text.

2 Lesson 17.1 Energy: An Overview What Is Energy? The ability to do work or cause a change Kinetic energy: Due to motion Potential energy: Due to an object s position or shape

3 Lesson 17.1 Energy: An Overview Forms of Energy I Mechanical: Associated with the motion and position of an object; can be kinetic or potential Electrical: Associated with electric charges; can be kinetic or potential Thermal: Kinetic energy of atoms and molecules the faster atoms and molecules move in an object, the warmer it becomes Overhead transmission lines carry electrical current.

4 Lesson 17.1 Energy: An Overview Forms of Energy II Electromagnetic: Kinetic energy that travels as waves Chemical: Potential energy stored in molecular bonds Nuclear: Potential energy stored by forces that hold atomic nuclei together Chemical energy is stored in food.

5 Lesson 17.1 Energy: An Overview Energy Conversion and Efficiency Energy cannot be destroyed; it can only be converted, or changed, from one form to another. Energy efficiency is an expression of how much of the energy put into a system actually does useful work.

6 Lesson 17.4 Nuclear Power Scientists estimate that nuclear power helps us avoid emitting 600 million metric tons of carbon each year worldwide.

7 ***WRITE ON PAGE 110 Nuclear Fission Splits an atomic nucleus into two smaller nuclei Releases neutrons and large amounts of energy. If enough unstable nuclei are present, a nuclear chain reaction can occur. Did You Know? About 20% of electricity produced in the United States comes from nuclear power.

8 Lesson 17.4 Nuclear Power Generating Electricity Using Nuclear Energy

9 Lesson 17.4 Nuclear Power Benefits and Costs of Nuclear Power Benefits No air pollution Costs Expensive to build and maintain Requires little uranium fuel and little mining Under normal conditions, nuclear power plants are safer for workers than coal-burning power plants. Catastrophic accidents are possible. Nuclear waste must be stored for thousands of years. Chernobyl

10 Lesson 17.4 Nuclear Power Nuclear Waste Waste is currently held at power plants as a stopgap, but a long-term storage location is needed. Long-term storage sites must be distant from population centers, protected from sabotage, have a deep water table, and be geologically stable. Yucca Mountain, Nevada, was chosen by the U.S. government in the 1980s, and a storage site was constructed there. But, as of 2010, the Yucca Mountain project is no longer under development. Yucca Mountain storage site

11 Lesson 17.4 Nuclear Power Nuclear Fusion Joining two atomic nuclei to form one nucleus Releases much more energy than fission Currently impractical because very high temperatures are needed, but scientists continue exploring fusion for our future energy needs

12 Fission vs Fusion 1. Both fusion and fission convert a little bit of into a lot of 2. What is used in all nuclear power plants? 3. Where does nuclear fusion happen? Is Nuclear Fusion About to Change Our World? 1. The NIF is the world s most powerful 2. How does iter differ from NIF? 3. Why is fusion better than fission for the environment?

13 Nukes Are Green 1. What is the authors opinion on nuclear energy? 2. What is the anticipated growth of energy needs? 3. What are his concerns about the other clean renewable energies? 4.What other nations use nuclear? 5.What is a safe energy plan in Kristof s view? 6.What are the dangers of nuclear energy? 7.What are the dangers of coal? 8.What is the author s criticism of hydropower? 9.Do you agree with the author s view? 10.Who do you think his audience is? 11.What do you think his level of expertise is?

14 Rally Against Nuclear Power 1.What is the author s view on nuclear power? 2.Why are the people rallying? 3. What has the government s response been? 4. What are the solutions currently being explored? 5. Why is it more dangerous to have a nuclear plant in Japan as opposed to another country? 6. What is the only way to avoid nuclear accidents? 7. How long will it take to clean up Fukishima? 8.Do you agree with the author s view? 9.Who do you think his audience is? 10.What do you think his level of expertise is?

15 Nukes are Green 1. What is the authors opinion on nuclear energy? 2. What is the anticipated growth of energy needs? 3. What are his concerns about the other clean renewable energies? 4.What other nations use nuclear? 5.What is a safe energy plan in Kristof s view? 6.What are the dangers of nuclear energy? 7.What are the dangers of coal? 8.What is the author s criticism of hydropower? 9.Do you agree with the author s view? 10.Who do you think his audience is? 11.What do you think his level of expertise is? Rally Against Nuclear Energy 1.What is the author s view on nuclear power? 2.Why are the people rallying? 3. What has the government s response been? 4. What are the solutions currently being explored? 5. Why is it more dangerous to have a nuclear plant in Japan as opposed to another country? 6. What is the only way to avoid nuclear accidents? 7. How long will it take to clean up Fukishima? 8.Do you agree with the author s view? 9.Who do you think his audience is? 10.What do you think his level of expertise is?