P2 - OCR Gateway
- Created by: Shruthi22
- Created on: 06-04-17 22:49
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P2 - Collecting energy from the Sun
Advantages of photocells:
- robust and are low maintenence
- no fuel needed nor long power cables
- cause no pollution and do not contribute to global warming
- use a renewable energy source
Only disadvantage is that they do not produce electricity when cloudy or dark.
How do they work?
- Contains two pieces of silicon joined together to make a p-n junction.
One has an impurity to create an excess of free electron (n type silicion). The other has a different impurity to produce an absence of free elections (p type silicon).
Photons are packets of the sun's energy - they cause free electrons to move producing an electric current.
The output depends on :-
- The intensity of light
- …
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