Through nine lessons, students are introduced to a range of energy types — electrical, light, sound and thermal — as well as the renewable energy sources of wind, hydro (water) and solar power. Subjects range from understanding that the movement of energy at the electron level creates electricity that powers our world, to recognizing the Sun as our ultimate energy source. Through numerous hands-on activities, students explore a wide range of scientific topics related to the fundamentals of energy: kinetic and potential energy, light waves, reflection, refraction, convection, sound waves, volume, pitch, frequency, radiation, heat capacity, heat transfer, specific heat. These concepts are presented in the context of engineering applications pertinent to our everyday lives. Other aspects of energy are explored, including energy consumption and conservation, batteries, simple circuits, conduction and insulation, polarization, power grid and blackouts. As they delve into details about wind, water and solar power, students learn about thermometers, anemometers, wind and water turbines (windmills and waterwheels), and even direct solar heating and cooking. See the Unit Overview section for topics by lesson.