Transistor is a switching element which controls the conduction of electricity. When Conduction is present the value is 1(binary value), and when conduction is not present the value is 0 ( binary value).
Parts of a transistor:
A transistor has three parts Collector, Base and Emitter.
Transistor is a switch but what is the difference between Manual Switch and Transistor as a switch?
Transistor does not have any moving parts. But a manual switch has moving parts like on and which a man control from outside. Semi-conductor material is used in transistor, when voltage is applied , the transistor is automatically on and off according to applied voltage. So, no need to control the transistor from outside.
What is Semi-conductor material?
The material which can not conduct electricity like Conductor and can not behave like insulator the material is called semi-conductor material. The conduction of a semi-conductor material is the middle of conductor and insulator.
1. P-type
2. N-type
- Valance band has 5 electrons.
- Always a free electron after bonding with semi-conductor.
- Because of free electron, it is called N-type semi-conductor.
- The free electron helps to flow the current when a voltage is applied.
- Valance band has 3 electrons.
- After bonding with semi-conductor, there is a hole for the lack of electron.
- Hole is a positive charge and can not move.
- A electron can move into the hole after the voltage is applied.
- Because of hole is considered as a positive charge, the material is known as P-type material.