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The computer power supply, often referred to as the PSU (Power Supply Unit), plays a crucial role in any computer system. It converts the alternating current (AC) from a wall outlet into the direct current (DC) required by the internal components of a computer. Without a stable power supply, even the most advanced computer hardware cannot operate effectively or safely.

How a Power Supply Works

The computer power supply distributes specific voltage levels to components like the motherboard, processor, graphics card, hard drives, and cooling systems. Each of these parts requires consistent and clean power to function properly. The PSU regulates this flow of electricity to prevent over-voltage, under-voltage, and power surges, all of which can damage sensitive components. High-efficiency power supplies also manage heat better and reduce energy waste, contributing to a quieter and more eco-friendly system.