Presentation on theme: "What is energy? O Energy is the ability to do work. O Just as food gives us energy to focus and play. O Different forms of “natural” energy O potential."— Presentation transcript:
What is energy? O Energy is the ability to do work. O Just as food gives us energy to focus and play. O Different forms of “natural” energy O potential O Kinetic O Thermal (heat) O Nuclear O Chemical O radiant
Natural vs. Artificial O There are forms of energy that are found in nature – radioactive elements like uranium (nuclear energy) - and there are artificial forms of energy such as cars moving due to petroleum.
Artificial Energy O There are two subdivisions in the artificial energy category: O Non-renewable energy: none left once it is used up O Renewable energy: can be used over and over again
Non-Renewable and Renewable O Non renewable energy: O petroleum O Coal O Nuclear O Natural gas O Renewable energy: O Solar O Wind O Biomass O Tidal O Hydro O geothermal
Solar, Wind, Hydro O Solar: create electrical power by converting radiation from the sun through material that creates voltage when exposed to light. O Wind: moving air (wind) makes blades rotate which in turn rotates a generator which produces electricity. O Hydro: moving water (from rivers) cause water turbines to rotate and generate electricity.
Biomass, tidal, geothermal O Biomass: organic material from plants convert the sun’s energy into chemical energy. This chemical energy can then be extracted from the biomass through combustion, to produce energy that can be used as heat. O Tidal: like hydro, it converts energy from tides (water moving according to the Earth-Moon relations) into electricity. O Geothermal: heat energy from the Earth’s interior (radioactive decay, volcanic activity, Earth’s inner core)