Inside there's a coil of wire wrapped around an iron core. When a current flows through this control wire, it creates a magnetic field. This pulls down the metal switch on top, which contacts the ...

Transistors are tiny electronic components that act as switches and amplifiers, and they dwell at the heart of modern technology. In simple terms, a transistor can turn a flow of electricity on or off ...

In this lesson, students build two circuits and explore how transistors function. When Bell Labs introduced the transistor in June of 1948, a spokesman proudly announced "This cylindrical object . . .