CONTENTS IO I2 14 16 18 Defining Energy Kinetic Energy Potential Energy Mechanical Energy Changing Forms of Energy Heat Energy Chemical Energy Electrical Energy Nuclear Energy Solar Energy Fossil Fuel Energy Alternative Energy Energy Everywhere Glossary For More Information Index 20 22 24 26 28 30 31 32
DEFINING ENERGY Energy is another word for power Energy makes things move It makes things warm It also makes machines work and makes living things grow People use energy from many different sources They use the power of wind water and sunlight Plants and animals provide people with energy in the form of food People also burn oil coal and natural gas for energy They wind water Sunlight Feed o Cool Natural Gas Uranium hydroelectric down All over the world energy is available in many forms How many kinds of energy can you see suggested by this
Figure 1 get nuclear energy from uranium Figure 2 Each of these forms of energy can be described as either potential energy or kinetic energy Energy cannot be created or destroyed It can only be changed from one form to another Figure 3 Figure 4 AP Energyi measured by how much work it does People measure heat energy in units called joules or calories The potential energy in electricity is measured in volts A wrecking crane uses energy to swing a heavy ball and that ball delivers a powerful blow right on
