Electronics

Electronics deals with flow of electrons through vacuum, gas or semiconductor.
Electron devices - vacuum tubes, gas filled tubes, semi conductor diodes, transistors etc.
electron devices - used in rectifier , amplifier, oscillator etc.
semiconductor materials - silicon and germanium
advantages s solid state devices
. Small in size
.  More efficient
.  Cheap.
Types of semiconductor: n type and p type
diode has two layers of n and p.
terminals of diode: anode and cathode.

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