11:20 PM Chapter 6 - Energy conversion |
Chapter 6
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introduction
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advantages and drawbacks
(disadvantages)
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solar cell or photo voltaic cell
o
construction
o
theory of operation
-
symbols
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circuit used
-
definitions
Introduction
Solar energy is an conventional renewable energy .
Solar energy appears to be most important energy in the future .
Advantages
1- it's free from cost
2- it's inexhaustible غير منتهية
3- it's completely pollution free
Drawbacks (disadvantages)
1- energy density per unit area is very law
2- it's available for any part of the day
3- it's cloudy and hazy atmosphere reduce energy received
Q. write short account in photo voltaic cell.خلية كهروضوئية
When
P.N Junction of solar cell illuminated ( electron – hole – pairs ) are
generated , an electric field is established near the P.N junction , which
leads to development of potential across the junction , many of electrons are
pulled across the junction by the force of electron field contribute to the
current in the cell
The
voltage of the cell is proportional to intensity or incident light , the
voltage may be as 0.6 volt .
Symbols
The Circuit used :
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