solar energy Flashcards
1
Q
what is solar energy caused by
A
nuclear fusion of hydrogen atom into helium atom in the sun (why the sun shines)
2
Q
what are the 2 components of the sun
A
- 75% hydrogen
- 25% helium
3
Q
what is the temp of the suns core
A
15 million degrees celsius
4
Q
what are the 3 types of rays that the sun emits
A
- infrared
- light
-ultraviolet
5
Q
what’s are pros of solar energy (3)
A
- renewable
- no greenhouse gases
- good option for isolated areas with no power
6
Q
what are cons of solar energy (3)
A
- low energy production for cost
- only areas with lots of sunlight are suitable
- production of solar panels and batteries use a lot of energy and chemicals
7
Q
what are passive heatings
A
sunny side windows with concrete to absorb heat and release it later
8
Q
what are photovoltaic cells
A
solar panels: created electric current from moving electrons when the sunlight hits the panels
9
Q
what are solar collectors
A
parabolic mirrors that focus the heat of the sun on a pipe carrying a special fluid
