Energy Types and Transformations Energy The ability to
Energy Types and Transformations
Energy • The ability to cause change
All forms of energy can be described in terms of two general types: 1. Kinetic Energy 2. Potential Energy
Kinetic – the energy of motion Example: car moving
Potential – stored energy that can be used at a later time Example: holding a soccer ball in your hands
Energy Types • Chemical • Mechanical • Electrical • Thermal (heat)
1. Chemical Energy • Specific arrangement of chemicals
Examples of chemical energy • If you strike the wood end of a match, nothing happens. If you strike the tip with the chemicals, the match will light.
Examples of chemical energy • Hand warmers • Glow sticks • Injury packs • Batteries
2. Mechanical Energy • Energy of an object that is moving
Examples of mechanical energy • Gears • Windmills • Riding a bike • Juggling • Turbines
3. Electrical Energy • Energy of moving electrons
Examples of electrical energy • Curling iron • Toaster • DVD player • Refrigerator
4. Thermal (heat) Energy • Movement of molecules to create heat • Energy flows from warmer to cooler objects.
Thermal (heat) Energy • Conduction • Convection • Radiation
Conduction • Transfer of energy through direct contact
Examples of conduction • Burning your hand on the hot stove • Pancake on the griddle • Burning your feet on the pavement on a hot summer day
Convection • Movement that transfers heat in a liquid or gas (circular)
Examples of convection • Heating your house • Cooking soup • Lava lamp
Radiation • Transfer of energy by light
Examples of radiation • Sunbathing • Heat from a bonfire • Tanning booth
Law of Conservation • Energy can neither be created or destroyed
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