* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Energy - Clocke
Efficient energy use wikipedia , lookup
Potential energy wikipedia , lookup
William Flynn Martin wikipedia , lookup
Open energy system models wikipedia , lookup
Kinetic energy wikipedia , lookup
Energy subsidies wikipedia , lookup
100% renewable energy wikipedia , lookup
Energy storage wikipedia , lookup
Low-Income Home Energy Assistance Program wikipedia , lookup
Public schemes for energy efficient refurbishment wikipedia , lookup
Regenerative brake wikipedia , lookup
Zero-energy building wikipedia , lookup
World energy consumption wikipedia , lookup
Low-carbon economy wikipedia , lookup
Energy Charter Treaty wikipedia , lookup
Energy policy of Australia wikipedia , lookup
Alternative energy wikipedia , lookup
International Energy Agency wikipedia , lookup
Internal energy wikipedia , lookup
Distributed generation wikipedia , lookup
Energy returned on energy invested wikipedia , lookup
Energy harvesting wikipedia , lookup
Energy efficiency in transport wikipedia , lookup
Energy policy of the United Kingdom wikipedia , lookup
Life-cycle greenhouse-gas emissions of energy sources wikipedia , lookup
Energy policy of Finland wikipedia , lookup
Negawatt power wikipedia , lookup
Conservation of energy wikipedia , lookup
Energy in the United Kingdom wikipedia , lookup
Energy policy of the European Union wikipedia , lookup
United States energy law wikipedia , lookup
Energy efficiency in British housing wikipedia , lookup
Energy Independence and Security Act of 2007 wikipedia , lookup
ENERGY ENERGY? Energy We drives our world. put it in our cars, food in our stomachs, and batteries in our toys because everything in our world needs energy to make it happen. Energy makes our world buzz with light, color, sound, and motion. Without energy, life would not be possiblenothing could grow, move or feel and the world would be a dark, cold and lifeless place. Where does it all come from? Most of our energy comes from the sun. Where did the sun get all its energy from? Scientists believe it came from the Big Bang No more energy has been created since or will it ever be made in the future. Energy is Everywhere Everything in the world involves energy changing from one form to another. Water in a water bottle. Sneakers on your feet. Muscles in your body. How do we define ENERGY? Energy can be defined as the ability to do work. If an object or organism does work (exerts a force over a distance to move an object) the object or organism uses energy. How do we measure energy? Because of the direct connection between energy and work, energy is measured in the same unit as work: joules ( J). James Prescott Joule Forms of Energy Energy is recognized in seven forms all of which a kinetic or potential Thermal (heat) Mechanical (motion) Chemical Nuclear Electrical ( electricity, lighting) Radiant/ Electromagnetic (light, x-rays) Sound (Motion) The Man Could Not Even Remember Snow! Potential vs. Kinetic All forms of energy fall under two categories. Potential energy is stored energy. Kinetic energy is motion. Potential vs. Kinetic All forms of energy fall under two categories. Potential energy is stored energy. Kinetic energy is motion. As a basketball player throws the ball into the air, various energy conversions take place. Ball slows down Ball speeds up Kinetic-Potential Energy • Roller coasters work because of the energy that is built into the system. Initially, the cars are pulled mechanically up the tallest hill, giving them a great deal of potential energy. From that point, the conversion between potential and kinetic energy powers the cars throughout the entire ride. Radiant Energy Electromagnetic energy that travels in transverse waves. Visible light X-rays Gamma rays Radio waves Thermal Energy The internal motion of the atoms is called heat energy, because moving particles produce heat. Heat energy can be produced by friction. The faster the molecules move, the more heat energy is produced. Examples: Friction Phase change Sound The movement of energy through objects or substance in longitudinal waves Chemical Energy Energy stored in the bonds that hold atoms together. When bonds are broken, energy is released. Examples: Digesting food…bonds are broken to release energy for your body to store and use. Sports… your body uses energy stored in your muscles obtained from food. Fire–a chemical change. Nuclear Energy Energy stored in the nucleus of an atom. Nuclear energy is the most concentrated form of energy. •When the nucleus splits (fission), nuclear energy is released in the form of heat energy and light energy. •Nuclear energy is also released when nuclei collide at high speeds and join (fuse – “fusion”) Nuclear Energy The sun’s energy is produced from a nuclear fusion reaction in which hydrogen nuclei fuse to form helium nuclei. Stored Mechanical Energy Energy stored in objects or substances by the application of force. Gravitational Potential Energy The energy of place or position. A waterfall, a suspension bridge, and a falling snowflake all have gravitational potential energy. Energy Conversion All forms of energy can be changed from one form to another. Changes in the form of energy are called energy conversions. The sun’s energy through solar cells can be converted directly into electricity. Green plants convert the sun’s energy (electromagnetic) into starches and sugars (chemical energy). Other energy conversions In an electric motor, electromagnetic energy is converted to mechanical energy. In a battery, chemical energy is converted into electromagnetic energy. The mechanical energy of a waterfall is converted to electrical energy in a generator. Energy Conversions In an automobile engine, fuel is burned to convert chemical energy into heat energy. The heat energy is then changed into mechanical energy. The Law of Conservation of Energy Energy can be neither created nor destroyed by ordinary means. It can only be converted from one form to another.