1. How does the sun make energy?
AIM:
How does the sun make energy?
Solar power
QOD: What is one benefit and one drawback to using wind power to generate electricity?

2. Aim: How does the sun make energy and how do we use it?

3. How does the sun make energy?
Objectives
AIM:
How does the sun make energy?
SWBAT describe the process of nuclear fusion
SWBAT compare and contrast active and passive
SWBAT describe what photovoltaic cells are and explain how they are used to capture energy from the sun. 3

4. How does the sun make energy?
AIM:
How does the sun make energy?
The Sun
A medium-sized star that radiates energy from nuclear fusion reactions in its core

5. How does the sun make energy?
Nuclear Fusion
AIM:
How does the sun make energy?
1. The sun turns hydrogen into helium
2. The mass lost transforms into energy (like in fission, in nuclear power)

6. How does the sun make energy?
AIM:
How does the sun make energy?
Solar power
1 square meter on earth gets ~ 1 kilowatt (17 light-bulbs) of energy
 A map of the world showing kilowatt hours per region
The sun’s energy is so strong that if only 0.1% of the earth (New Mexico + South Dakota) were covered in solar panels, we would have enough electricity for the whole world.

7. 2. Active Passive How do we collect solar power? Two main ways… AIM:
How does the sun make energy?
How do we collect solar power?
Two main ways…
2. Active
Passive

8. How does the sun make energy?
AIM:
How does the sun make energy?
1. Passive solar energy collection
=use the sun’s energy to heat something directly
Ex: 700 yrs ago, Ancestral Puebloans lived in passive solar cliff dwellings
Ex: materials chosen that absorb heat well, South-facing windows

9. How does the sun make energy?
AIM:
How does the sun make energy?
1. Passive solar energy collection

10. How does the sun make energy?
AIM:
How does the sun make energy?
2. Active solar energy collection
= using technology to focus, move, or store solar energy.

11. How does the sun make energy?
AIM:
How does the sun make energy?
2. Active solar energy collection

12. How does the sun make energy?
AIM:
How does the sun make energy?
Power tower in Spain

13. How does the sun make energy?
AIM:
How does the sun make energy?
Photovoltaic cell
Photovoltaic cell – produces electricity
“photo” = light
“volt” = electricity

14. How do photovoltaic cells work?
AIM:
How does the sun make energy?
How do photovoltaic cells work?
1. Sunlight hits the array
Array = a group of photovoltaic cells
2. Electrons are released
3. Moving electrons  electricity!

15. How does the sun make energy?
AIM:
How does the sun make energy?
Is solar power renewable or non- renewable?

16. How does the sun make energy?
AIM:
How does the sun make energy?
Passive or active?
With your group-mates, read about the different ways people are using solar power to take care of their energy needs.
For each example discuss whether you think it is active or passive solar energy collection.
3. Answer the questions on your CW

17. How does the sun make energy?
AIM:
How does the sun make energy?
Summary…
Do you think you could implement any of these examples where you live?