what is transistor

A transistor is a semiconductor device its used to amplify and work as a electronic switch  and electrical power. It is make by semiconductor material. basically at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistor's terminals controls the current through another pair of terminals. Because the controlled  power can be higher than the controlling (input) power, a transistor can amplify a signal. Today, some transistors are packaged individually.

Transistor is used in many circuits,devices and microcontroller,microprocessor maked by many no of transistors.

                                       
                                      MANY TYPES OF TRANSISTORS              http://amzn.to/2uaE89q

•  Bipolar Junction Transistors
• Field Effect Transistors

 

                                            TYPES OF TRANSISTOR BY OWN FUNCTIONING

 

• Small Signal Transistors
• Power Transistors
• High Frequency Transistors
• Phototransistors
• Unijunction Transistors