P2 Collecting energy from the Sun

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  • Created by: Nicole10
  • Created on: 25-11-15 12:07
Photocell advantages...
1) Robust (little maintenance required) 2) No fuel or long power cables required 3) No pollution (so no global warming) 4) Renewable energy resource
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Photocell disadvantage...
No electricity produced when dark or too cloudy
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A photocell contains...
Two pieces of silicon joined together -> p-n junction
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N-type silicon has...
Excess of free electrons
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P-type silicon has...
Absence of free electrons
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What are the energy packets that sun light contains called?
Photons
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What do photons do?
They cause free electrons to move producing an electric current
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Output from a photocell depends on...
1) Light intensity 2) Surface area exposed 3) Distance from light source
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Type of radiation involved in passive solar heating is...
Infrared
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Infrared has a ------ wavelength
Short
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Why can infrared radiation from the sun enter the building?
Glass is transparent to this short wavelenth radiation
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How does passive solar heating work?
1) Walls and floor absorb the radiation 2) It warms and re-radiates it 3) The glass then reflects it back inside the building because the wavelength has become longer due to the walls and floor being less hot than the sun
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Why can the infrared wavelenth (that has been re-radiated) not pass through the glass?
It has become longer and so is reflected
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How do solar reflectors work?
They are moved by a computer so they are always facing the sun
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Wind turbines don't work when...
There is no wind or wind speed is too great
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Wind farm advantages...
1) Don't contribute to global warming 2) Don't pollute the atmosphere
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Wind farm disadvantages...
1) Noisy 2) Takes up lots of space 3) Spoils view
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Other cards in this set

Card 2

Front

No electricity produced when dark or too cloudy

Back

Photocell disadvantage...

Card 3

Front

Two pieces of silicon joined together -> p-n junction

Back

Preview of the back of card 3

Card 4

Front

Excess of free electrons

Back

Preview of the back of card 4

Card 5

Front

Absence of free electrons

Back

Preview of the back of card 5
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