Transistor

Transistor

A transistor is a semiconductor electronic device that allows the control of electric current flow. It is composed of three terminals, two of which form a PN junction, and is used to amplify, switch, or rectify electrical signals. Transistors are essential components of modern electronics and are found in almost all electronic devices.

Analogy:

A transistor is like a faucet that can be turned on and off with a switch.

The faucet represents the PN junction of the transistor. The switch represents the electrical signal applied to the transistor. When the switch is turned on, the faucet is open and water can flow freely. When the switch is turned off, the faucet is closed and water cannot flow.