1. P PT 1
Solar power
Describe how electricity can be generated
using solar power

2. Generating electricity from the Sun

3. Q. Why does a satellite still need batteries?

4. Solar cells convert light
Generating electricity from the Sun
Solar cells convert light
energy directly into
electricity.
* EXPENSIVE
* 12% EFFICIENT
Useful for:
- remote places
- low power devices
Sun light intensity depends on:
* time of day
* season
* global location

6. A solar thermal power station
500 C
Mirrors reflect the sun’s energy to a collector at the top of the tower.
They are controlled by computer to track the sun
Water is converted to steam which drives a turbine and generator.

8. The eternal plane

10. Generating electricity from the Sun

11. Heating water using the sun
Panel design features:
* Panel faces south
* copper piping covering large area
* insulation between panel and roof
* shiny surface at back of panel

12. ( About 800
Watts per square metre
in the South of England)

15. Solar energy Radiation Geothermal energy Solar energy
Q2. a X cells generate 0.2 W from each cell = 300 W
300W/ 0.2W = cells
Q2. b. Batteries are used when the satellite is in the earth’s shadow.