Category: Power Supplies

The power supply unit (PSU) is the primary source of electrical power for all other hardware components. It converts alternating current (AC) from your wall outlet into the direct current (DC) that your PC parts require. A typical PSU provides multiple voltage rails, including 3.3V, 5V, and 12V, each serving different components within your system. For example, the 12V rail is crucial for powering your CPU and graphics card, while the 5V rail might supply power to hard drives and other peripherals.