Human Uses of Energy

Use Diagrams: This diagram shows a turbine and generator used in a hydropower plant. What is the function of the turbine in the power plant?

• It pushes water through the dam.

• It causes the generator to move.

• It produces electricity that flows into power lines.

• It heats the water to produce steam that turns the generator.

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Interpret: Laura read an article about combustion of fuel to produce energy. The article stated that the energy for any fuel used in combustion comes from the sun. What does that statement mean?

• The fuels used to produce power are renewable sources of energy.

• All fuels originally come from plants that used sunlight or animals that ate the plants.

• The fuels absorb energy when sunlight shines on them and release the energy when they burn.

• Electric power in power plants can only be produced using different kinds of stored solar energy.

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Use Evidence: The graph shows the types of energy used in a recent year. What was the largest renewable energy source during that year?

• hydropower

• natural gas

• petroleum

• wind

Explain: In what way does a nuclear power plant have a smaller impact on the environment than a coal power plant?

• Nuclear power plants are smaller than coal power plants

• The fuel for a coal plant is mined, but the fuel for a nuclear plant is not.

• Nuclear power plants do not release pollutants into the atmosphere, but coal power plants do.

• Nuclear power plants do not cause heat impacts that can harm the environment, but coal plants do.

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(a)   is produced by changing some other form of energy.

Common fuels include:

• coal

• natural gas

• petroleum

• wood

• water

During combustion, a ​ (a)   occurs that releases energy that is stored in ​ (b)  

• chemical change
• fuel.
• fire
• air.
• spark
• the battery.

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The origianl source of energy of almost all fuels is the (a)   .

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A generator changes ​ (a)   into ​ (b)   .

• the enegy of motion
• electrical energy
• chemical energy
• solar energy
• heat energy
• sound energy

A ​ (a)   stores ​ (b)   and can convert that energy into ​ (c)   .

• battery
• chemical energy
• electrical energy
• log
• phone
• turbine
• solar energy
• wind energy