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Student ObjectiveTo 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

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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

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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.

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Energy Sources Web ExplorationLook 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?

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BGE

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BrainPOP : Fossil Fuels

- Energy and Fossil Fuels

BrainPOP | Fossil Fuels

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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!

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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

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Fossil Fuel FormationAncient 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!

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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

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

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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.

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Electricity Production

REMEMBER:Electricity is a secondary energy source

therefore it must be generated from other energy sources (like fossil fuels) through through energy transformationsenergy transformations.

• Complete the Energy Transformation Map using textbook pages 168-169

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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 potentialthe sun burned