What is the primary function of an op-amp?

What is the primary function of an op-amp?

• A. To amplify weak electrical signals
• B. To store charge
• C. To rectify currents
• D. To regulate power supply

Answer: (A)

An op-amp is designed to take a small voltage difference between its two inputs and produce a much larger output voltage. Its value lies in high gain and very high input impedance, which lets it sense a tiny signal without loading the source and then amplify it for further processing. In practical circuits, negative feedback through resistors sets the exact gain and shapes the frequency response, making op-amps versatile for amplifiers, filters, and signal conditioning.

This isn’t about storing energy, rectifying current, or regulating a supply. Storing charge is the realm of capacitors or memory elements, rectification is done by diodes or rectifier circuits, and regulation of power supplies is handled by voltage regulators.