Computer power supply is the electric source of all
components of a computer. Though it is one of the neglected one compare
to the other parts, power supply is a must for a system. Often this part
of a computer gets failure and most of the time it is not serviceable.
It will be more easier and cheaper to replace than try to service it.
You should give due attention like you do for other components when you choose or replace the power supply unit.
Function of computer power supply
The function of power unit is to convert the
electrical power (AC) comes from wall socket to a suitable type and
voltage (DC) so that each component of a computer works properly.
Luck of proper supply of power will damage a
computer system. The power supply receives 120 or 230V and converts into
3.3V, 5.5V and 12V. Why different converted power? That is because all
components of a computer system don’t need the same power.
For example, motherboard and cards use 3.3V. The most power demand parts such as Fan and drives need 12V to operate.
Choosing Computer power supply
Usually, power units comes with a case, however,
it is a requirement to know the factors behind this unit before picking a
new one. Power supplies available on the market have different size and
shape that will fit into a particular type of computer case. This is
called Form factor, layout and dimensions of a unit.
When you are going to replace a malfunction power
unit, you should choose the exact form factor that will go with the
existing case of your computer.
There are different power supply form factors, but ATX and LPX are the popular types found in most systems.