Power Supply

          Power Supply is a main component of Computer system. The computer cannot run without it. The power supply uses 120 volts AC. This voltage is found inside the power-supply case. In most cases there is no need to open the power supply case and work on the power to open the power supply case and work on the power supply. The cost of a new power supply is low enough that it is generally easier to replace than repair, However should you decide to open the case be careful. Remember the power switch on most computers (usually located on the front of the computer) also   uses 110 volts AC to turn the power supply on or off. If you are working on a computer and leave it plugged in to provide proper grounding this present a hazard.

Power

          Computers run on electrical energy. Without it , a computer might as well be a paperweight. The energy or power to drive a computer is derived from electricity. Whether is uses 110 volts alternating current (AC) the US standard, 220 volts AC, the European standard or direct current (DC) from a battery, a computer is useless without a steady reliable source of power.

Power Supply

Types of Circuits

      Open Circuit

                  An incomplete electrical circuit in which no current flows is called open circuit.

      Close Circuit

                  A complete electrical circuit around switch current flows or a single circulates is called close circuit.

      Parallel and series circuits

                  Circuits consisting of just one battery and one load resistance are very simple to analyze, but they are not often found in practical applications usually first an example of a series circuit.

      Short Circuit

                  When current cannot flows through his designated path, or flows through an other path is called short circuit.

AC Current

      AC stands for Alternating Current. AC power is what most people think of as electricity. It comes from the wall and powers most of our lights and house hold appliances. AC power is main- made using generators.

DC Current

      DC stands for Direct Current Alternating current is used for transporting low-cost power to end users. The PC’s power supply performs several tasks, but the main function is to convert AC into DC. A computer’s power supply combines two components to handles this job.

Styles of PC Power Supply.

      ATX

1.      In the ATX type power supply the fan should be mounted along the inner side of the supply drawing air in from the rear of the chassis and blow it inside across the mother board. This kind of air flow runs in the opposite which exhaust air out the back of the supply through a hole in the case where fan is mounted.

2.      Another benefit of the reverse flow cooling is that the system would run cleaners, freer from dust and dirt.

3.      For systems that operate in extremely harsh environments you can add a filter to the fan intake vent to further ensure that all the air entering the system is clean and free the dust.

ATX Power Supply

BTX

BTX stands for Balanced Technology Extended is a from factor motherboard originally slated to be the replacement for the again ATX motherboard from factor in late 2004 and early 2005. It has been designed to alleviate some of the issues that arose from using newer technologies which often demand more power and create more heat on mother boards compliant. The ATX and BTX standards were both proposed by Intel.

BTX Power Supply

AT

            AT stand for Advance Tehcnology.