Lesson 2
Energy Transfers and Transformations
Predict three facts that will be discussed in Lesson 2 after reading the headings. Write your
facts in your Science Journal.
Law of Conservation
of Energy
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Express the law of conservation of energy in a diagram.
.
Energy
can be
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cannot be
Apply the law of conservation of energy to energy
.
transformations that occur in a flashlight.
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Chemical
transformed
energy from
to
the battery
moving
transformed
through the to
contact
strip to the
bulb
+
in the bulb
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Contrast energy transfer with energy transformation.
.
Energy Transfer
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.
Energy Transformation
Identify three criteria required for an energy transfer to be
considered an occurrence of work.
1.
2.
3.
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.
Explain what makes an energy transformation inefficient.
Using Energy and Heat
125
Lesson 2 | Energy Transfers and Transformations (continued)
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.
Distinguish an open system from a closed system.
Open System
Definition:
Closed System
Definition:
Example:
Example:
Explanation:
Explanation:
Categorize resources that people transform into electric energy.
Energy Transformations
and Electric Energy
Category
.
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.
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.
an energy resource
that is replaced as
fast as, or faster
than, it is used
Nonrenewable
energy resource
Types
•
•
•
•
•
•
•
Designate what percentages of our electric energy come from
categories of resources. Write the percentage in the category boxes
in the table above.
Synthesize It
126
Using Energy and Heat
Explain two reasons it is wise to use energy-efficient electric appliances.
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
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Definition