What is the primary function of a power supply?

The primary function of a power supply is to convert AC power to DC power. Many electronic devices require a steady and consistent DC voltage to operate correctly, as they are typically designed to run on direct current. AC power, which is what is commonly supplied by electrical outlets, can vary in voltage and polarity, making it unsuitable for direct use in most electronic circuits.

Power supplies perform the essential task of ensuring that the electrical energy provided to the device is in the form that it needs. This process often involves rectification, which is the conversion of alternating current (AC) to direct current (DC). In addition to converting the power, power supplies may also regulate voltage to ensure that the device receives a stable power supply at the correct level, preventing damage or malfunction from voltage fluctuations.

The other options describe functions that do not encapsulate the primary role of most power supplies. For instance, converting DC to AC is the reverse process and typically involves an inverter, while enhancing AC signal strength pertains to amplification rather than the fundamental function of a power supply. Storing electrical energy is also not a core function of a power supply; that task is generally managed by batteries or capacitors.