06-03-2013, 12:13 PM
BASIC ELECTRICAL AND ELECTRONIC COMPONENTS
BASIC ELECTRICAL.ppt (Size: 2.78 MB / Downloads: 122)
RESISTOR:
The first band gives the first digit
The second band gives the second digit
The third band indicates the number of
zeroes.
DIODE:
A Diode is a two terminal electronic component that conducts electric current only in one direction.
Based on applications diodes are divided into two types
-> PN junction
-> ZENER diode
PN junction diode:
The most common function of a diode is to allow an electric current in one direction (called the forward direction) while blocking current in the opposite direction (the reverse direction).
ZENER DIODE:
A Zener diode is a type of diode that permits current in the forward direction like a normal diode, but also in the reverse direction if the voltage is larger than the breakdown voltage known as "Zener knee voltage" or "Zener voltage".
INDUCTOR:
An inductor or a reactor can store energy in a magnetic field created by the electric current passing through it. It is denoted in Henry.
Typically an inductor is a conducting wire shaped as a coil, the loops helping to create a strong magnetic field inside the coil due to Faraday's Law of Induction.
TRANSISTORS:
A transistor is a semi conductor device commonly used to amplify or switch electronic signals. A voltage or current applied to one pair of the transistor's terminals changes the current flowing through another pair of terminals. Because the controlled (output) power can be much more than the controlling (input) power, the transistor provides amplification of a signal.
OPERATION OF RELAY:
The relay's switch connections are usually labeled COM, NC and NO:
COM = Common, always connect to this, it is the moving part of the switch.
NC = Normally Closed, COM is connected to this when the relay coil is off.
NO = Normally Open, COM is connected to this when the relay coil is on.
Connect to COM and NO if you want the switched circuit to be on when the relay coil is on.
Connect to COM and NC if you want the switched circuit to be on when the relay coil is off.
Overview of Embedded System
Embedded system means the processor is embedded into that application.
An embedded product uses a microprocessor or microcontroller to do one task only.
In an embedded system, there is only one application software that is typically burned into ROM.
Example: printer, keyboard, video game player.