Energy 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 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