Energy Transformation

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Energy

•The ability to cause change

All forms of energy can be described in terms of two general types:

1. Kinetic Energy2. 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 Transformations

•Chemical•Mechanical•Electrical•Thermal (heat)

1. Chemical Energy•Potential energy stored in chemical bonds of compounds•Energy is released when the bonds are broken

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

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