TECHChapter27revised

TECHChapter27revised - PowerPoint Presentations for...

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Permission granted to reproduce for educational use only. © Goodheart-Willcox Co., Inc. Technology By R. Thomas Wright The Goodheart-Willcox Company, Inc. Tinley Park, Illinois www.g-w.com PowerPoint Presentations for
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Permission granted to reproduce for educational use only. © Goodheart-Willcox Co., Inc. Applying Technology: Using Energy Section 8
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Permission granted to reproduce for educational use only. © Goodheart-Willcox Co., Inc. Chapter 27 Energy: The Foundation of Technology
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Permission granted to reproduce for educational use only. © Goodheart-Willcox Co., Inc. Learning Objectives Define energy. Describe the difference between potential and kinetic energy. Identify the differences among energy, work, and power. Identify the six major forms of energy. Identify exhaustible, renewable, and inexhaustible energy sources.
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Permission granted to reproduce for educational use only. © Goodheart-Willcox Co., Inc. Learning Objectives Explain how energy technology can make our lives better and how energy technology can cause damage.
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Permission granted to reproduce for educational use only. © Goodheart-Willcox Co., Inc. Types of Energy Energy is used in simple human tasks, like walking. Kinetic energy is when a sail captures the wind to power a boat. Potential energy is stored energy in a flashlight battery, a gallon of gasoline, etc.
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Permission granted to reproduce for educational use only. © Goodheart-Willcox Co., Inc. Measuring Work Work is measured by combining the weight moved and the distance moved. Force (Weight) x Distance = Foot-pounds (ft.-lbs.) In the metric system, work is measured in joules .
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Permission granted to reproduce for educational use only. © Goodheart-Willcox Co., Inc. Measuring Power Power = Work done (in ft.-lbs.) / Time (in seconds) The metric version: Power (in watts) = Work done (in joules) / Time (in seconds)
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Permission granted to reproduce for educational use only. © Goodheart-Willcox Co., Inc. Horsepower Horsepower describes the output of many mechanical systems. 1 Horsepower = 550 ft.-lbs./sec
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Permission granted to reproduce for educational use only. © Goodheart-Willcox Co., Inc. Types of Horsepower An engine or motor rarely reaches its maximum or indicated horsepower . The brake horsepower is delivered at the rear of an engine. Drawbar horsepower is delivered to the hitch of tractors. Frictional horsepower is the power needed to overcome the internal friction of the device.
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Permission granted to reproduce for educational use only. © Goodheart-Willcox Co., Inc. Discussion What is the difference between work and power?
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Permission granted to reproduce for educational use only. © Goodheart-Willcox Co., Inc. Wattage Rating
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TECHChapter27revised - PowerPoint Presentations for...

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