Alternative Energy Resources 1. Solar 2. Wind 3. Nuclear 4. Hydroelectric 5. Geothermal 6. Tidal - PowerPoint PPT Presentation

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Alternative Energy Resources 1. Solar 2. Wind 3. Nuclear 4. Hydroelectric 5. Geothermal 6. Tidal

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Alternative Energy Resources 1. Solar 2. Wind 3. Nuclear 4. Hydroelectric 5. Geothermal 6. Tidal 4.2 Alternate Energy Sources 1. Solar energy s fuel is free. – PowerPoint PPT presentation

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Title: Alternative Energy Resources 1. Solar 2. Wind 3. Nuclear 4. Hydroelectric 5. Geothermal 6. Tidal


1
Alternative Energy Resources 1. Solar 2.
Wind 3. Nuclear 4. Hydroelectric 5.
Geothermal 6. Tidal
2
4.2 Alternate Energy Sources
  • Solar energy has two advantages

1. Solar energys fuel is free.
2. Solar energy is non-polluting.
  • How do we use solar energy?
  • Solar collectors provide hot water for more than
    80 of Chinese homes.

3
4.2 Alternate Energy Sources
Photovoltaic Cells Converts the suns energy
directly into electricity
4
4.2 Alternate Energy Sources
  • Example of solar energy use
  • Solar One Barstow California

5
4.2 Alternate Energy Sources
  • Disadvantages to Solar Energy
  • High start up costs to buy panels
  • Must have a battery back-up when there is no
    sunlight

Solar panels 30 W Foldable panels 300 or
about 40,000 start up cost per household
125 W 500/year
6
Hot Water Solar Panel costs about 1200 per
household to install
7
4.2 Another Alternative EnergyNuclear Power Plant
8
4.4 Nuclear Power
? Fuel for nuclear plants comes from
radioactive materials (uranium ) that release
energy through nuclear fission
? In nuclear fission, the nuclei of heavy atoms
such as uranium-235 are bombarded with neutrons.
? The uranium nuclei split into smaller nuclei
and emit neutrons and heat energy.
Uranium atom
Release heat
9
Shearon Harris Nuclear Plant-Apex NCThere are 2
other nuclear power plants in NC
10
4.2 Alternate Energy Sources
  • Advantages of nuclear power
  • 1. no air pollution emitted
  • 2. greater output of electrical energy than coal
  • Disadvantages of nuclear power
  • Cost of building safe facilities (about 1
    billion)
  • Disposal of waste (stored in underground tunnels)
  • Concern of a serious accident (melt down)

11
Chernobyl Disaster-Russia-1987
12
4.2 Alternate Energy SourcesWind Power
? In the next 50 to 60 years, wind power could
meet between 5 to 10 percent of the countrys
demand for electricity.
13
Wind Turbines AdvantageA renewable energy
sourceDisadvantages 1. Noisy 2. Kill Birds
http//www.youtube.com/watch?vRtgBWNKwBkE 3.
Require a lot of land or coastal area
14
4.2 Alternate Energy Sources
? Hydroelectric power is the power generated by
falling water.
  • Water held in a reservoir behind a dam
  • Water can be released through the dam to produce
    electric power.

? Strong water flow that results drives
propellers of turbines and creates electric power
from generators.
15
How Does Hydroelectric Power Work?
Generator
Turbine
16
Advantages of Hydroelectric power
  1. Does not cause air pollution
  2. Renewable source of electrical energy

17
Disadavantages of hydroelectric power1.Use
water that could be used to water crops and
drinking water2. Dams block migration of fish
upstream
18
4.2 Alternate Energy SourcesGeothermal Energy-
How does it work?
electricity
  • Geothermal energy is harnessed by tapping natural
    underground reservoirs of steam and hot water.
  • ? Hot water is used directly for heating and to
    turn turbines that generate electric power.

turbine
Hot steam
from underground geysers
19
The Geysers Is the Worlds Largest Electrical
Geothermal Facility
20
Geothermal Energy
  • Advantage
  • Does not cause air pollution
  • Disadvantage
  • 1. Only available in areas with geyser activity

21
4.2 Alternate Energy SourcesTidal Power- How
does it work?
  1. Tidal power is harnessed by constructing a dam
    across the mouth of a bay or an estuary in
    coastal areas.

2. The strong in-and-out flow of tidal water
drives turbines and electric generators.
22
Tidal Dams
23
Tidal Power
  • Disadvantage
  • Can use tidal power only in areas that experience
    tides (coastal areas)
  • Advantages
  • Renewable energy source
  • No air pollution
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