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Transcript
Energy
•Ability to do work … “Does stuff”
•Energy comes in many different forms
•Energy can change from one form to another
Forms of Energy
Mechanical:
Nuclear:
Heat:
Electrical:
Chemical:
Sound:
Electromagnetic
(Light):
Radio:
States of Energy
Potential Energy:
“waiting to be used”
Kinetic Energy:
“being used / released”
Law of Conservation of Energy
Energy in the universe is neither created or destroyed
(there is a constant amount of energy)
Energy can only be converted from one form to another
(energy isn’t “lost”, it merely changes form)
Energy conversions occur without loss or gain in energy
(however, not all forms of energy are “useful”)
Nuclear
Sun: H2
light
sunlight
He
chemical
Energy of plants
chemical
Food energy ( carbos, lipids, etc)
mechanical
Energy of you moving
mechanical
Energy of a turbine
electrical
Light & heat
Electricity (moving electrons)
Light bulb turns on, gives off heat
Nuclear
Sun: H2
light
sunlight
He
chemical
Energy of plants
chemical
Oil (millions of years ago)
Mechanical
car moving