What is Transistor How do transistor works About transistors Transistors What is Transistor? A transistor is a device that regulates current or voltage flow and acts as a switch or gate for electronic signals. Transistors consist of three layers of a semiconductor material, each capable of carrying a current. The transistor was invented by three scientists at the Bell Laboratories in 1947, and it rapidly replaced the vacuum tube as an electronic signal regulator. By three brilliant US physicists: John Bardeen (1908�1991), Walter Brattain (1902�1987), and William Shockley (1910�1989). A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistors terminals changes the current through another pair of terminals. Because the controlled (output) power ca...