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