transistor also a semiconductor components that is made up of two diodes and is a fundamental component in almost all electronics devices. The main function of transistor is to amplify and switch electronic signals and power. It is composed of a semiconductor material with at least three terminals for connection to an external circuit.
A bipolar (junction) transistor is a three-terminal electronic device constructed of doped semiconductor material and may be used in amplifying or switching applications. Bipolar transistors are so named because their operation involves both electrons and holes. Charge flow in a this transistor is due to bidirectional diffusion of charge carriers across a junction between two regions of different charge concentrations. This mode of operation is contrasted with unipolar transistor such as field effect transistor, in which only one carrier type is involved in charge flow due to drift. By design, most of the this transistor collector current is due to the flow of charges injected from a high-concentration emitter into the base where they are minority carriers that diffuse toward the collector, and so transistor are classified as minority-carrier devices.
the BIPOLAR JUNCTION transistor
In addition, we also learnt how to deal with IC (integrated circuit), or we can called it a chip or microchip. Most interestingly, this small components is made up by thousands or millions of tiny resistors, capacitors, and transistors. So, that is mean an IC can be as amplifier, counter, etc.
this is how an IC looks like
the first leg of an IC starts from the left.