http://www.ck12.orgCHAPTER
17 Introduction to Energy
Chapter Outline
17.1 Types of Energy
17.2 FORMS OFENERGY
17.3 ENERGYRESOURCES
17.4 REFERENCES
The whirring blades of these wind turbines look stark against the darkening sky at sunset. The energy of the wind
causes the blades to spin, and the energy of the spinning blades is used to generate electricity. People have been
using wind for energy for centuries. Until about 200 years ago, for example, ships depended on wind to sail the
oceans. And windmills have long been used to gather wind energy to pump water and do other useful work. Today,
wind energy is making a comeback. Do you know why? What might be advantages of using the wind for energy?
This chapter has the answers.
Lee Bailey.www.flickr.com/photos/leebailey/ 6066524282 /.CC BY 2. 0.