* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Energy - Alvin ISD
Open energy system models wikipedia , lookup
Kinetic energy wikipedia , lookup
Cogeneration wikipedia , lookup
Compressed air energy storage wikipedia , lookup
Potential energy wikipedia , lookup
Energy subsidies wikipedia , lookup
100% renewable energy wikipedia , lookup
Public schemes for energy efficient refurbishment wikipedia , lookup
Regenerative brake wikipedia , lookup
Energy Charter Treaty wikipedia , lookup
Low-Income Home Energy Assistance Program wikipedia , lookup
Energy storage wikipedia , lookup
World energy consumption wikipedia , lookup
International Energy Agency wikipedia , lookup
Low-carbon economy wikipedia , lookup
Zero-energy building wikipedia , lookup
Energy efficiency in transport wikipedia , lookup
Energy returned on energy invested wikipedia , lookup
Life-cycle greenhouse-gas emissions of energy sources wikipedia , lookup
Gibbs free energy wikipedia , lookup
Energy harvesting wikipedia , lookup
Energy policy of Finland wikipedia , lookup
Alternative energy wikipedia , lookup
Internal energy wikipedia , lookup
Distributed generation wikipedia , lookup
Negawatt power wikipedia , lookup
Environmental impact of electricity generation wikipedia , lookup
Micro combined heat and power wikipedia , lookup
Energy policy of the European Union wikipedia , lookup
Energy in the United Kingdom wikipedia , lookup
Energy Independence and Security Act of 2007 wikipedia , lookup
Energy efficiency in British housing wikipedia , lookup
Energy • Chapter 16.1 • As the roller coaster zooms up and down the track, the energy changes btwn kinetic and potential energy. Energy • Energy comes in many different forms: – – – – potential energy kinetic energy solar energy nuclear energy Uses of Energy • We use energy everyday: – – – – – to cook run vehicles keep buildings warm/cool communicate to run the miniature factories (cells) in our bodies • What is energy? Vocabulary Word • energy: the ability to do work or produce heat • kinetic energy (KE = 1/2mv2) energy of motion • potential energy (GPE = mgh) energy of position or composition Energy is Conserved • As water runs through the turbines of the hydroelectric plant, some of the potential energy is converted into electrical energy Energy is Conserved • As wood burns in a fire, some of its potential energy is released as heat Energy is Conserved • Energy is always changing forms, but the total amount of energy does NOT change. • Energy is conserved. Vocabulary Word • Law of conservation of energy: in any chemical reaction or physical process energy is neither created nor destroyed (though it may change from one form to another). Chemical Potential Energy • Chemical potential energy is energy stored in a substance because of its composition (position of its electrons). • octane (C8H18) is a component of gasoline Chemical Potential Energy • potential energy in octane is from the arrangement and strength of the bonds • as octane burns, some of the energy is converted to work to move the pistons and some is converted to heat. Vocabulary Word • heat (q): energy flows from a warmer object to a cooler object Heat • The warmer object gets cooler • The cooler object gets warmer • They will both continue to transfer heat until both reach the same temperature Vocabulary Word • calorie: the amount of heat required to increase the temperature of pure water by 1 oC • Calorie: nutritional Calorie is equal to 1000 calories or 1kcal Vocabulary Word • joule: the SI unit for heat. 1 joule is equal to 0.2390 calories. 1 calorie is equal to 4.184 joules Specific Heat • Since 1 calorie (or 4.184 joules) is the amount of heat to increase the temperature of water by 1oC, the specific heat of water is 4.184 joules Specific Heat • Different substances have different specific heats • Some substances require less energy to heat up (gold) and others require a lot (water) Water • Water has a very high specific heat. • Large bodies of water (lakes, oceans...) can absorb and release large amounts of heat, that’s why the climate near a large body of water is more stable. Vocabulary Word • specific heat: the amount of heat required to raise the temperature of 1 gram of a substance by 1oC Heat Absorbed or Released • The amount of heat absorbed or released by a substance can be calculated using the following formula: q = c x m x T heat = specific heat x mass in grams x change in temperature Energy • The sun is an inexhaustible source of energy. • Why can’t the solar energy meet all our energy needs? Solar Energy • Why can’t the solar energy meet all our energy needs? – only available during the day – must be able to store (solar ponds) – sodium sulfate decahydrate pools (dissolve/recrystalize) – photovoltic cells Photovoltic Cells • convert solar energy directly into electricity