Energy and Renewable Energy

Energy

the ability to do work

measured in joules (J)

Energy Change

the action of energy changing from one form to another

Forms of Energy

Kinetic

Potential

Heat

Sound

Light

Nuclear

Chemical Electrical

Kinetic

Energy that a moving body has

Potential

Stored energy due to the position of an object

Heat

Energy that is transferred or moved between particles at different temperatures

Sound

Energy that is produced by vibrating particles or objects

Light

Energy in the form of waves

Nuclear

Energy produced from nuclear reactions

Electrical

Energy that comes from the flow of electric charge

Chemical

Energy that is stored between the bonds in substances and chemicals

Law of Conservation of Energy

Energy is neither created nor destroyed but can be converted from one form to another

Energy Conservation

the need to avoid wasting useful forms of energy

Energy Dissipation

the change in energy from a useful form to a not so useful form

Efficiency

the ability to avoid wasting energy when changing from one form to another

Fossil Fuels

non renewable energy - will run out

Coal, Oil, Peat, Gas

Renewable Resources

Wind Power, Hydro-electric, Geothermal, Solar Panels

Energy Change - example

Solar Energy to Heat Energy

Less electricity is needed to heat water in our homes

How does sound travel?

1. Vocal chords vibrate, creating kinetic energy

2. The kinetic energy passes to the air. The air molecules vibrate.

3. The air molecules in the ear vibrate and knock the eardrum

4. We can hear.