* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download ENERGY power point
Open energy system models wikipedia , lookup
Low-Income Home Energy Assistance Program wikipedia , lookup
Public schemes for energy efficient refurbishment wikipedia , lookup
Energy storage wikipedia , lookup
Zero-energy building wikipedia , lookup
100% renewable energy wikipedia , lookup
Energy Charter Treaty wikipedia , lookup
Energy subsidies wikipedia , lookup
Potential energy wikipedia , lookup
Kinetic energy wikipedia , lookup
Regenerative brake wikipedia , lookup
Low-carbon economy wikipedia , lookup
Energy efficiency in transport wikipedia , lookup
World energy consumption wikipedia , lookup
Internal energy wikipedia , lookup
International Energy Agency wikipedia , lookup
Energy returned on energy invested wikipedia , lookup
Alternative energy wikipedia , lookup
Energy harvesting wikipedia , lookup
Energy policy of Australia wikipedia , lookup
Energy policy of Finland wikipedia , lookup
Environmental impact of electricity generation wikipedia , lookup
Energy policy of the United Kingdom wikipedia , lookup
Negawatt power wikipedia , lookup
Distributed generation wikipedia , lookup
Energy policy of the European Union wikipedia , lookup
Conservation of energy wikipedia , lookup
Energy efficiency in British housing wikipedia , lookup
United States energy law wikipedia , lookup
Energy in the United Kingdom wikipedia , lookup
Energy applications of nanotechnology wikipedia , lookup
Life-cycle greenhouse-gas emissions of energy sources wikipedia , lookup
Energy Independence and Security Act of 2007 wikipedia , lookup
Energy • Energy – The ability to do work. • • • The sun is going to die!! Oh No!! (in 5,000,000,000 years) Mechanical Energy Total energy of motion and position of an object. It can be all potential energy, all kinetic energy, or some of both. Kinetic Energy The energy of motion Potential Energy – The stored energy that result from the position or shape of an object. Elastic potential energy –The potential energy associated with objects that can be compressed or stretched. Gravitational potential energy – Potential energy related to an objects height. Weight x Height There are 6 Forms of Energy • • • • • • • • • 1) Mechanical a) Kinetic energy- energy of a moving object. ex.- rock rolling down a hill. kinetic energy = 1/2 mv2 example; a 20 kg goat ran at 3 m/s. 20kg x (3m/s) 2 = 20kg x 9 m/s2 = 180 = 90 J 2 2 2 – b) Potential Energy- “possible” energy that an object has because of its position-. ex- rock on top of a hill. Potential energy= mass x gravity x height ( g=9.8 m/s/s) Example: a 40 kg skateboarder is on a 2m ramp. 40 kg x 9.8 m/s/s x 2m = 784 J 2) Chemical energy- Potential energy stored in the chemical bonds that hold molecules together. Chemical energy is stored in food, fossil fuels (gasoline, oil, coal), batteries, and wood and cells in our bodies. 3) Electrical energy- Energy of moving electrons. It is often an “in- between” form between 2 other forms of energy. Can be kinetic or potential Examples- electric heater, blender. power plant (burns coal) →→power lines→→→blender (chemical- thermal) (electrical) (kinetic) 4) Electromagnetic ( or radiant) energy: The energy of waves. Red orange, yellow, green blue indigo violet Visible light is only 1/1000th of the electromagnetic spectrum. Thermal Energy Thermal energy is the total potential and kinetic energy of particles in an object. (You should know about this already!) 6) Nuclear energy- Energy locked in atoms. The energy can be released by splitting atoms (known as fission- This happens in nuclear power plants) or by combining atoms (known as fusion- happens in the sun and in nuclear bombs) Fusion Fission Renewable vs. Nonrenewable energy Energy sources can be either 1) Renewable- The source is replenished (comes back) quickly by natural processes. Examples- wind, solar, hydropower (dams), geothermal (heat from underground), plants, trees (some), cow dung. Non Renewable Energy Resources that cannot be replaced after they are used or can be replaced only over thousands or millions of years. Fossil fuels are the most important nonrenewable resources. 2) Nonrenewable- The source is used up and it is not replaced. Examples -fossil fuels (coal, oil, gasoline), uranium (nuclear power source), trees (some)