* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Lewis Energy types
Dark energy wikipedia , lookup
Efficient energy use wikipedia , lookup
Open energy system models wikipedia , lookup
William Flynn Martin wikipedia , lookup
Kinetic energy wikipedia , lookup
Energy storage wikipedia , lookup
Energy subsidies wikipedia , lookup
100% renewable energy wikipedia , lookup
Low-Income Home Energy Assistance Program wikipedia , lookup
Regenerative brake wikipedia , lookup
Public schemes for energy efficient refurbishment wikipedia , lookup
Zero-energy building wikipedia , lookup
Low-carbon economy wikipedia , lookup
World energy consumption wikipedia , lookup
Energy Charter Treaty wikipedia , lookup
Alternative energy wikipedia , lookup
Energy policy of Australia wikipedia , lookup
Internal energy wikipedia , lookup
International Energy Agency wikipedia , lookup
Distributed generation wikipedia , lookup
Energy returned on energy invested wikipedia , lookup
Energy policy of the United Kingdom wikipedia , lookup
Energy harvesting wikipedia , lookup
Energy policy of Finland wikipedia , lookup
Energy efficiency in transport wikipedia , lookup
Life-cycle greenhouse-gas emissions of energy sources wikipedia , lookup
Conservation of energy wikipedia , lookup
Energy in the United Kingdom wikipedia , lookup
Negawatt power 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: What do we remember? ENERGY Where is energy found and when? Energy is around you all the time What is energy? Ability to do work When work is done, what happens to energy? Energy is given off What is the SI unit for energy? Joules (J) Energy has the same SI unit as what? Work What are the two states of energy? What can you tell me about KINETIC ENERGY?(KE) • • • • Greek = kinetikos = “moving” Energy of motion/movement Depends on mass and speed KE = mv2 2 • ↑ speed = ↑ KE • ↑ mass = ↑ KE • Speed has greater effect than mass What can you tell me about POTENTIAL ENERGY (PE) • Energy of position/shape • Stored energy • Gravitational Potential Energy (GPE) – (GPE) = weight x height –Nxm=J MECHANICAL ENERGY (ME) • • • • • Objects total energy of motion and position ME = PE + KE PE ↑ = KE ↓ PE ↓ = KE ↑ ME remains constant Pendulum 8 Car on an incline 9 Energy can take different forms… THERMAL ENERGY • KE • Total energy of particles (atoms and molecules) that make up object • ↑ movement = ↑ KE = ↑ temp. = ↑ thermal energy • Particles far apart have more energy than particles close together. Energy vs. Thermal energy Least energy Particle movement most thermal energy Amount of particles Most energy CHEMICAL ENERGY • PE • Compound energy that changes arrangement of atoms • Stored in bonds between atoms • Chemical rxn takes place ELECTRICAL ENERGY • KE • Moving electrons back and forth through wire or current • Produced at power plants SOUND ENERGY • • • • • PE and KE Energy of vibrations Transmits energy to air Carried through solids, liquids, and gases Travels in waves LIGHT/RADIANT ENERGY • Not all light can be seen • Vibrations of electrically charged particles • Travels through waves and empty space NUCLEAR ENERGY • Produced from change of nucleus • Two types – Fission: splitting nucleus (electrical energy) – Fusion: joining nuclei (sun) • Uranium: – stores a lot of PE – energy used from nuclei being split – generated at nuclear power plants VENN DIAGRAM OF FORMS OF ENERGY KINETIC ENERGY POTENTIAL ENERGY THERMAL CHEMICAL SOUND NUCLEAR LIGHT/RADIANT ELECTRICAL ENERGY CONVERSIONS • Transfer/change/conver sion of energy from one form to another • Can be transferred converted to more than one form Energy Conversions “Breakfast is the most important meal of the day.” Eating Chemical Energy Being active Kinetic Energy Body temperature Thermal Energy Energy Conversions electrical chemical electrical light and sound electrical light and thermal electrical kinetic and sound electrical kinetic, thermal, and sound Energy Conversions Energy Conversions Energy Conversions Explain the energy conversions below. ENERGY AND MACHINES • Machines make work easier by changing – Size – Direction – or both of the force required to do the work • Machines transfer energy and convert energy Why are energy conversions important? • It is useful for every day life. – Ex. Wind used to cook a meal • Efficiency – Ex. Energy efficient light bulbs and appliances WHERE DOES THE ENERGY GO? • Energy is never lost but converted to other forms of energy • Hills and friction help to tell what happens to energy • Energy is used to overcome friction • Some of the energy is always converted to thermal energy Law of Conservation of Energy • Energy can neither be created or destroyed • Closed system- well-defined group of objects that transfer energy between each other. • Total amount of energy always the same • Ex. Roller coaster, light bulb Perpetual motion machine • Runs forever without additional energy • Energy in = Energy out • Will never happen because some energy is turned into thermal energy. REFERENCES • http://www.glenbrook.k12.il.us/gbssci/phys/ mmedia/energy/ce.html http://www.physicsclassroom.com/mmedia/energy/se.html