Energy. Types of Energy Kinetic – energy of motion Potential – stored energy Thermal – form of...
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Transcript of Energy. Types of Energy Kinetic – energy of motion Potential – stored energy Thermal – form of...
Energy
Types of Energy
• Kinetic – energy of motion• Potential – stored energy• Thermal – form of energy associated with
heat• Nuclear - energy stored in the nucleus of
an atom and released through fission, fusion, or radioactivity
• Radiant – energy associated with light
Characteristics of Energy
• Energy is strictly an abstract concept, but it can be measured.
• Energy may be stored or transported by material objects or by fields.
• Energy may be transformed from one type to another.
• Energy is conserved (First law of Thermodynamics)
Thermal Energy• Not the same as heat!• Joule’s paddlewheel experiment
– Work - kinetic, potential, and heat??– A new type of energy!
• Temperature• Temperature scales and absolute zero• The transfer of thermal energy – HEAT!
– Conduction– Convection– Radiation
Entropy
• The tendency toward disorder or chaos.
• The 2nd Law of Thermodynamics: Entropy always increases! (Like Humpty Dumpty)
• The Heat Death of the Universe
Nuclear Energy
• energy stored in the nucleus of an atom and released through fission, fusion, or radioactivity
• 1 gram of wood converted in 1 second would release 9 x 1013 W of power! Between 10000 and 100000 tons of TNT! A bomb!
• The sun loses ~ 4 x 106 tons every second to continue “burning.”