Which technology regulates voltage and current for a computer's power needs?

The power supply unit (PSU) is crucial for regulating voltage and current to meet a computer's power needs. It takes the alternating current (AC) from the wall outlet and converts it into direct current (DC), which is used by the computer's components. The PSU also ensures that the output voltage levels align with the specific requirements of various parts, such as the motherboard, graphics card, and storage devices.

Furthermore, a power supply unit typically includes voltage regulation circuitry to maintain stable voltage levels and prevent damage to sensitive electronic components. This makes it a central component in a computer system, as it not only provides power but also protects the system by adjusting voltage and current supplies according to the demands of the hardware.

While other options such as voltage regulators, transformers, and integrated circuits play roles in managing or altering electrical signals, they do not encompass the overall power supply function that the PSU performs in a computer system.