What is the primary function of an operational amplifier?

The primary function of an operational amplifier is to amplify voltage signals. Operational amplifiers are designed to take a small input voltage signal and significantly increase its voltage level so that it can drive other components in a circuit or produce a measurable output. This amplification is achieved through the op-amp's high gain characteristics and differential inputs, which allow it to respond to the difference in voltage between its two input terminals.

While there are other electronic components that perform specific functions such as converting AC to DC, regulating current, or filtering noise, these tasks are not the primary purpose of an operational amplifier. It is essential to recognize that the core utility of operational amplifiers lies in their ability to amplify voltage, which is why their design and applications are centered around this function. This foundational attribute makes op-amps versatile devices in various electronic circuits, including amplifiers, integrators, and filters, among others.