P2 Collecting energy from the Sun

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
View more cards

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