1. Explain one disadvantage and one advantage of nuclear power
Do Now (silently!!)
Explain one disadvantage and one advantage of nuclear power

2. Solar Energy
Passive solar collection uses buildings designed to maximize direct absorption of sunlight in winter as they keep the interior cool in summer
Involves installing low, south facing windows to maximize sunlight capture in the winter
Overhangs shade windows
Heat absorbing construction materials

4. Solar cookers are portable ovens that use reflectors to focus sunlight onto food and cook it

6. Active solar energy uses technological devices to focus, move, or store solar energy

8. Photovolatics video

9. Photovoltaic cells
Photovoltaic cells (PV) collect sunlight and convert it to electrical energy directly
Light strikes one of a pair of metal plates, causing the release of electrons, which are attracted to the opposing plate
The flow of electrons creates an electrical current, which can be
converted into alternating
current (AC) and used for
power

12. Benefits of Solar Power
Practically inexhaustible energy source
PV cells use no fuel, are quiet and safe, contain no moving parts, require little maintenance, and do not require a turbine or generator to work

13. Benefits of Solar Power
They allow for local control over power without needing a power plant
Does not pollute the air with greenhouse gases and other air pollutants
Manufacturing PV cells requires fossil fuel use

14. Benefits of Solar Power
In developing countries, solar cookers enable families to cook food without gathering fuelwood
Lessens deforestation and can relieve social problems
In developed countries, families with solar panels are connected to the electrical grid and can sell their excess energy back

15. Negatives of solar energy
Not all regions are sunny enough to provide adequate power, given current technology
The up-front cost of investing in the equipment is higher than other renewable energy sources, and much higher than fossil fuels

16. Wind Power

20. Modern Wind Turbines
Wind turns the blades of a rotor, which rotate the machinery inside a compartment called a nacelle (with a generator), which sits aside a tall tower
Usually, a group of turbines is set up in an area called a wind farm

21. Wind Power today
Wind provides a small portion of the world’s power needs, but it is growing very quickly
5 nations provide 82% of the world’s wind energy output (US, Germany, Spain, Denmark, India)
In Denmark, wind farms provide 20% of the nation’s power

22. Benefits of wind power
Produces no emissions once the equipment is installed
Is very energy efficient (produce 23 times more energy than they consume)
Nuclear is 16:1, coal is 11:1, and natural gas is 5:1
Wind turbines can bring economic benefits to rural areas when they sell the electricity

23. Negatives of wind power
We have no control over when wind with occur, so wind cannot be the sole source of electricity
Some areas do not have enough wind to support a wind farm
Many places with the required amount of wind are not large population centers
Wind farms are not aesthetically pleasing
May pose a threat to birds and bats

25. Urban wind tower video??