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Transcript
Forms of Energy and Energy Transformations Energy has a number of different forms it can be in o All matter came from energy…Big Bang Higgs Field Forms of Energy Break up into potential and kinetic forms… o Mechanical Energy (motion of objects) Kinetic Potential o Thermal Energy (heat) o Chemical Energy (food, plants, fossil fuels, batteries) o Electrical Energy (energy of moving electrons) Mechanical energy is usually converted to electrical energy (electricity) using a generator o Electromagnetic Energy Energy from Sun created by fusion…form from moving ions o Sound Energy o Nuclear Energy Fusion of hydrogen inside sun creates electromagnetic energy Fission inside nuclear power plants E=mc2 Energy Transformations Law of Conservation of Energy (LoCoE): Energy cannot be created or destroyed, it can only be changed from one form of energy to another o The amount of energy (in joules) always remains the same o However energy can transform into other forms These are called energy transformations Domino video… Examples: • Burning coal – chemical to thermal and EM • Phosphorescence (firefly) – chemical to EM • Playing a violin – mechanical to Sound • Turning on a lamp – electrical to thermal and EM • Sun emitting energy- nuclear to EM Energy Transformation Demos 1. Cookie Jumping Jacks ______________ ____________________________ 2. Battery _____________ T.V. Remote _____________________________ 3. Your hand Your partners hand _______________ _____________________________ 4. Before a glow stick is cracked After glow stick is cracked ________________________ _______________________ 5. Wires in car system Subwoofer http://www.youtube.com/watch?v=rddjVwbYwdg&feature=related __________________ ____________________________ 6. Light switch __________________ Light bulb _________________________________
