Replica of the first transistor in operation, which today belongs to the company Lucent Technologies. Transistor is a semiconductor electronic device used to deliver an output signal in response to an input signal. It fulfills the functions of an amplifier, oscillator, switch or rectifier. The term “transistor” is the English contraction of transfer resistor (“transfer resistor”). Currently it is found in practically all electronic devices of daily use such as radios, televisions, audio and video players, quartz watches, computers, fluorescent lamps, tomographs, cell phones, although almost always within the so-called integrated circuits, in 1925 by the German Werner HEISENBERG, and expanded by the formulation of the Austrian Erwin SCHRÖDINGER in 1926, including wave-particle dualities, probabilities and fundamental indeterminacies between positions and velocities, consistent with what is found in nature. In 1947, three researchers from the BELL Laboratories (Bell Telephone Laboratories): John BARDEEN (1908-1991), Walter BRATTAIN (1902-1987) and William SHOCKLEY (1910-1989), who manufactured a small “element” with revolutionary implications that called “TRANSISTOR” (transfer-resistor or transfer resistance), for which they would receive the Nobel Prize in Physics in 1956. “