1. 15.3 Energy Resources

2. Review What is energy, kinetic, potential? What is energy conversion?
What’s the law of conservation of energy?

3. Nonrenewable Energy Resources
Nonrenewable Energy Resources- exist in limited quantities and, once used, cannot be replaced except over the course of millions of years
These resources are being used much faster than they can be replaced…
Include: oil, natural gas, coal and uranium

4. Nonrenewable Energy Resources
Fossil Fuels- were formed underground from the remains of once-living organisms
Ex: oil, natural gas, and coal
Currently, fossil fuels account for the great majority of the world’s energy use
Their use creates pollution 

5. Renewable Energy Resources
Renewable energy resources- resources that can be replaced in a relatively short period of time.
Most renewable resources originate directly or indirectly from the sun
Include: hydroelectric, solar, geothermal and wind energy

6. 1) Hydroelectric Energy
Hydroelectric Energy- energy obtained from flowing water
Some hydroelectric power plants simple depend upon the natural flow of water in a river
Most rely on dams build across rivers
A dam blocks the flow of water, storing potential energy that is converted into kinetic when the water is released
Low cost to produce, lack of pollution

8. 2) Solar Energy
Solar Energy- sunlight that is converted into usable energy
Passive solar designs use sunlight to heat a building without using machinery
For example. Sunlight passing through the windows of a house may be absorbed by thick walls and then radiate thermal energy
In an active solar system, sunlight heats flat collection plates through which water flows
The heated water may be used directly for the buildings hot water needs, or it may be used to heat the house

9. **Solar Energy is non-polluting but for areas where cloudy days are frequent, solar energy is less practical

10. 3) Geothermal Energy
Geothermal Energy- thermal energy beneath the Earth’s surface
The geothermal power
plant pumps water into
the ground, where it turns
into steam. The steam is
then used to drive electric
generators.
Non polluting, but it not
widely available

11. Conserving Energy Resources
Energy Conservation- finding ways to use less energy or use energy more efficiently
Making appliances, cars, and even light bulbs more energy efficient is a way or reducing energy use while still enjoying its benefits
Energy-efficient purchases often cost more initially, but can save money in fuel costs over time

12. Page 466
Problems 1-5