1. What is A Power Supply Unit
Power supply units convert AC power from the mains socket. Usually power supply units are
built to conform to the ATX form factor. Power supply units should be used with different
components inside a computer. ATX power supplies can be turned on and off a signal from
the motherboard.
Power supplies are usually rated based on their maximum output power. For personal
desktop computers this usually ranges between three hundred to five hundred watts,
however gaming computers with multiple processors may require a higher level unit, which
can go up to two kilo watts.
Buying Guide
If you want to buy a power supply for your computer, you will choose the price according to
the quality of the product. Gaming computers and other powerful systems need a reliable
supply of electricity, so it is necessary to buy the best quality supply you can afford, such as
a 450W ATX power supply. The power supply is the heart and soul of your computer and it is
the unit to keep it healthy. The more CD drives, hard drives and other elements you add to
your computer, the more strain it puts on your power supply. If you do not have a power
supply of high quality, you will find that your system suffers from inconsistent levels of power
and hardware failures.
The high quality power supply unit will reduce the amount of noise made by your computer.
The noise you hear is the caused by the fan, which is a necessary component used to cool
down your power supply. New, efficient and powerful supplies will deliver regulated power,
meaning that the fan will not need to work as hard to cool down the supply, so you will find
that it makes much less noise.
Technical Terms

2. As a buyer, it is sometimes difficult to understand the terminology used by the computer case
supplier. When purchasing a power supply for your PC look out for the phrase 'mean time
between failures'as this figure will represent the average time a power supply is expected to
perform before it fails. It is also necessary to buy a power supply unit which has overvoltage
protection. This prevents the signal from being received if the voltage exceeds the limit of the
power supply.
The power supply units have a maximum load current which dictates the greatest current it
can safely handle. The maximum load current allows consumers to calculate the amount of
power their equipment can provide the number of devices it can support. The efficiency level
of the power supplies is another important factor. This value is expressed as a percentage
and is given the power to enter the rate of supply rate against it out. A higher proportion of
better, more efficient supply, it will generate less heat, and keep your computer safe
operation of a longer time.
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