Stands Upright
Computers, the basics…............................................................................
The basics of the computer start from the casing. Cases are offered in two styles, desktop and tower. Today the tower type is predominant. It stands upright and is much taller than it is wide. It is usually placed on the floor next to, or under a desk. The desktop has a pizza box profile and usually sits on the desktop. The motherboard and power supply mount to the floor at the rear of the case. The drives (hard, floppy and CD/DVD) mount in enclosures called drive bays at the front of the case.
The next most important thing would be the motherboard. The central unite inside the casing that is the brain of the computer. Of course the name mother coincides with the function. One of the major components inside the mother board is the cpu. The Central Processing Unit is often an Intel Pentium or Celeron processor. It is the heart of every PC. All scheduling, computation and control occurs here. Yes nothing would be possible without using a power supply which is supposed to supply power to the entire system. A power supply is installed in the back corner of the PC case, next to the motherboard. It converts 120vac (standard house power) into DC voltages that are used by other components in the PC. Where we store our date, the hard disk drive, also denoted by HDD. The HDD installs in one of the 3-1/2 inch internal drive bays in the PC. It is secured by machine screws. Data is stored magnetically on multiple rigid disks that are stacked up like pancakes. Small arms with magnetic pickups move rapidly back and forth across the top and bottom surface of each disk in the drive. The sensors float just a few microns above the rotating disk surface and can read and write data at very high rates. Most commercially available hard drives rotate at 5400 or 7200 RPM (revolutions per minute) which translates to 90 or 120 revolutions per second respectively. The data transfer rate from the drive to the motherboard is 33 Mbytes/second in bursts. Newer drives are capable of higher speeds up to 66 Mbytes/sec. To use this faster drive, the PC must have an ATA/66 interface that is capable of keeping up with it. These days storage has gotten more, and you get easily find hard drives which have a capacity of more than a terabyte. And yes how would you see whatever is going on without a monitor? They are available in screen sizes from 14" to 21". A 17" display means that it is 17" measured diagonally from one corner of the tube to the other. The actual viewing area is smaller than 17" (about 16") since the electron gun can't sweep completely to the tube edge. So this covers the very basics of the computer’s outlook. Stay tuned for more in the coming days.
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Laptop computer allows you to work without being tethered to an office. Portability and good performance make notebook PCs an essential part of the daily lives of millions of people, from college students to business travelers.
Key Features
Processor: Intel's Core Duo and Core 2 Duo processors have helped notebooks gain ground in the power department.
Some notebooks use AMD's Athlon Turion 64 X2 dual-core processor, which also supports for improved performance. The Turion 64 X2 and the Core 2 Duo both provide 64-bit support, which will become increasingly useful as more 64-bit applications reach the market.
Low-end notebooks offer Intel's Celeron M processor, which is generally not as speedy as the Core Duo processors.
System memory: Unless you're buying on the cheap, a new notebook generally includes 512MB of system memory. Many notebooks today are available with 1GB of RAM. Equipping your laptop with 1GB of RAM at the time you buy it will help extend its useful lifetime.
Screen: Notebook screens continue to get bigger and most have gone wide, enabling you to view spreadsheets or movies with ease. Even budget shoppers can afford the luxury of high-resolution color. Most notebook manufacturers offer laptops with 17-inch wide screens, too. Frequent business fliers can choose from among the many laptops with screen sizes of 12.1 or 13.3 inches, some of which are wide-screen models, as well.
Notebooks with standard-aspect 14.1 or 15-inch screens remain available, but they're not as plentiful as wide-screen models.
Battery: Notebook battery life has continued to improve. Some notebooks can run for up to 7 hours. Many vendors offer supplemental batteries to boost battery life.
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