1. 1 Student Objective To explain how energy transformations produce electricity To examine the energy source use in the United States Warm Up What energy conversions take place to go from the sun to electricity generated using fossil fuels? _____ _____ _____ nuclear radiant chemical thermal mechanical electrical

2. 2 Energy Sources 1. What are the nine energy sources used in the United States? ____________________________________________________________ ______________________________________________________ 2. What are the two main categories of energy sources? Explain each. ____________________________________________________ 3. What makes electricity different from other sources of energy? ________________________________________________________________ __________________________________________________ 5. What two sources are used the most in the United States? _________________________________________________________ 6. What category of fuel are these two sources in? _________________________________________________________ 7. What type of energy source are these 2 sources? ________________ Biomass, hydropower, geothermal, wind, solar, petroleum (oil), natural gas, coal, & uranium (nuclear) a. Renewable - they are replenished in a short time. a. Nonrenewable - supplies are limited It is a secondary source of energy, it must be generated from other energy sources. coal & natural gas Fossil fuels Nonrenewable GO ON

3. 3 Fossil Fuels – coal, petroleum (oil), & natural gas Scan pages 166-169 in textbook and answer these two questions: Where did the energy in fossil fuels come from? How is the energy in fossil fuels released? A fossil fuel’s energy comes from the sun and is stored in the plants & animals that converted the sun’s energy into chemical energy. A fossil fuel’s chemical energy is released when it is burned.

4. 4 Energy Sources Web Exploration Look at these pie charts of the energy sources in the United States for 2007 & 2013 & compare with the graphic on your worksheet. How have our energy sources changed?

5. 5 BGE

6. 6 BrainPOP : Fossil Fuels - Energy and Fossil Fuels BrainPOP | Fossil Fuels

7. 7  Let’s take a look at the flow of energy when fossil fuels are burned and used in power plants to produce electricity:  Energy Conversions on Earth begin with our Sun! 1.Hydrogen atoms in the center of the sun are moving very fast, colliding to make helium atoms. When this collision happens, is released and converted into To Step 2: nuclear energy electromagnetic energy or light energy!

8. 8 Step 2: Energy Conversion #2  The trees and other living green organisms use the electromagnetic, light, energy during photosynthesis! That electromagnetic or light energy is then converted into and stored up in the plants’ cells! chemical energy

9. 9 Fossil Fuel Formation Ancient plants and animals (over 300 million years ago) died, got buried over millions of years by more sediment, got compressed, heated, and chemically changed into coal, petroleum, and natural gas. This is a picture of coal!

10. 10 Step 3: Energy Conversion #3 Those fossil fuels have a great amount of stored chemical energy in them! That chemical energy allows the fuels to be burned and the energy is changed into. thermal energy

11. 11 Step 4: Energy Conversion #4  That thermal energy is used to boil water and create steam! That steam moves through pipes therefore it is converted into. mechanical energy

12. 12 Step 5: The mechanical energy of the steam allows the turbine to move/work and the mechanical energy of the turbine allows the generator to move/work! The mechanical energy is finally converted into electrical energy.

13. 13 Electricity Production REMEMBER: through energy transformations Electricity is a secondary energy source therefore it must be generated from other energy sources (like fossil fuels) through energy transformations. Complete the Energy Transformation Map using textbook pages 168-169

14. 14 Conclusions: What did we discover today? Energy can not be Forms of energy are constantly transforming into ____________are the most commonly used energy source in the United States. Fossil fuels have ______ energy (________) from ________ which is released when _________. created or destroyed other forms of energy Fossil fuels chemical potential the sun burned