chapter 9 electronics.ppt
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CHAPTER 9
ELECTRONICS
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What is Thermionic Emission?
• Thermionic Emission is the release of electrons from a
heated metal cathode
Filament cathode anode
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9.2 SEMICONDUCTOR DIODES
• Semiconductor is a group of materials
that can conduct better than insulators
but not as good as metal conductors.
The examples of pure semiconductor:
• Silicon• Germanium
• Selenium
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What is the “doping process?
• Doping is a process of adding a certain
amount of other substances called
dopants such as Antimony and Boron to
a semiconductor, to increase its
conductivity .
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n!t"pe semiconductors
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p!t"pe semiconductors
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What is the function of semiconductor diode ?
• The function of semiconductor diode is to allow
current to flow through it in one direction only.
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What the meaning of rectification?
• Rectification is a process to convert analternating current into a direct current by
using a diode.
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