What is the primary function of a transistor in a circuit?

The primary function of a transistor in a circuit is to amplify signals. Transistors are semiconductor devices that can control the flow of electrical current. When a small input signal is applied to the base of a transistor, it allows a much larger output current to flow from the collector to the emitter. This amplification property makes transistors essential components in various applications, such as audio amplifiers, radio frequency transmitters, and signal processing circuits.

In addition to amplification, transistors can serve other functions, such as acting as switches and enabling digital logic in computing devices. However, their ability to increase the amplitude of a signal is considered their fundamental role in circuits. Understanding this principle is crucial for electronics technicians working with analog and digital signals.