What is a Power Supply Unit (PSU) and how does it work?

12 Tem 13:43

Man, PSU—power supply unit—is basically the "heart" of your PC. It takes the AC power from the wall (220V) and converts it into the DC voltages your computer needs (12V, 5V, 3.3V, etc.). So it’s like the middleman that delivers stable, clean power to all your components (motherboard, CPU, SSD, fans, etc.). If the PSU is low-quality, voltage fluctuations can cause your system to shut down or even fry your parts. I once used a cheap PSU five years ago, and when the voltage spiked, I fried both my GPU and motherboard. Now I only go for 80+ Bronze/Gold certified PSUs. If you're building a new rig, calculate the required wattage using a site like OuterVision, and invest in reliable brands that deliver stable voltage like you’d expect from a smart home system. PSUs spend about 80% of their life running at low loads, so picking one with 20-30% extra wattage capacity is a smart move.