Let’s know some basic specification and concept about power supply of PC.

What are power supply unit and its function?
An easy terms power supply means the component of PC that collects a specific amount power from 110/220v. AC voltage line and convert dc voltage and supply different components according to demand. Most of the people of our country consider it as a less important but in other words it is very important for the PC and it can be called as a heart of PC. During purchasing computer most of the people use cheap power supply which price is 8-12$. My opinion is that giving valuable price should use decent power supply.
power supply of PC


Power supply unit rails
Prior to we said that power supply means the component of PC that collects a specific amount power from 110/220v. AC voltage line and convert dc voltage and supply different components according to demand. But in all component of PC same voltage is not operated. The components of PC generally operate +3.3v, +5v, +12v, -12v, +5vsb (standby). PSU AC line converts 110v/220v voltage, in those voltage and supply power. 
 
Negative rail
Most of the time negative rail remains in power supply such as -12v, -5v rail. -5v rail is not generally found in present power supply unit. In old from floppy controller has used -5v rail. Some LAN adapter use -12v rail, that’s why less power has been used.
 
On the basis of rail two types of power supply:
• Multi rail PSU
in our main component of PC more than one +12v rail is present such as processor, CPU cooling fan or water cooling system collect power from +12v rail. 
 
• Single rail PSU
At present this power supply unit is very helpful and this type of power supply unit remains only +12v rail and a specific AMPIRE remains for those +12v rail. The pc component that operates +12v rail, collects power according to need from +12v rail.

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