4. What is Diode?
A Diode is the simplest two-terminal
unilateral semiconductor device. It allows
current to flow only in one direction and
blocks the current that flows in the opposite
direction. The two terminals of the diode
are called as anode and cathode. The
symbol of diode is as shown in the figure.
9. Zener Diodes
This diode runs in reverse bias
condition when the voltage reaches the
breakdown point. A stable voltage can
be achieved by placing a resistor across
it to limit the current. This diode is used
to provide reference voltage in power
supply circuits
10. Light Emitting Diodes (LED)
This is the most popular kind of
diode. When it works in the
forward bias condition, the current
flows through the junction to
produce the light.
11. LASER Diode
This diode produces laser type
of light and are expensive as
compared to LED.They are
widely used in CD and DVD
drives.
12. PN Junction Diode
These diodes are used to allow current to
flow in one direction while blocking
current flow in the opposite direction.PN
junction diode is a typical diode
13. Rectification
The process of converting A.C
waveform into d.c waveform is called
Rectification.
Methods:
• Half-wave Rectification
• Full-wave Rectification
14. Half-wave Rectification
A type of rectification in which one half
cycle of the input A.C current is
converted into d.c current