Computer Power Supply

Many people don't know or not sure which one or how many watt of power supply should used for computer. In this scenario, depend on what you do. Each hardware we attach on motherboard using some voltage and watt. This value different with each hardware.This is some list of hardware with watt usage:- Intel cpu-> Intel Celeron socket 478 = 35 watts - 78watts **-> Intel Pentium 4 socket 478 = 58