Computer systems or simply computer hardware, form the back bone of a computer along with its operating software is the sum of many parts, namely monitor, central processing unit, keyboard, mouse and more.
The system unit is the actual computer, while every thing else is called a peripheral device. The hardware includes the physical components, such as the mother board, chips, memory and hard drives. The hardware is constantly improving in a kind of leap frog fashion. It is most often the bottle neck when it comes to data transfer speeds or how fast a software program can work.
A mother board is the central or primary printed circuit board, PCB, making up a complex electronic system of a modern computer or laptop. It is the under lying circuit board of a computer. The central processing unit, CPU, random access memory, RAM, hard drive, disk drives, and optical drives are all plugged into interfaces on the mother board. A video interface and sound card can be optionally built in or added.
The CPU, which is also known as the central processing unit or processor. The CPU is essentially the brains of your computer. Without the CPU, you would not be able to play games, type research papers, or surf the Internet. Your computer would basically be a very expensive paperweight.
The micro processor is the heart of the computer. The basic functionality of a micro processor is all based on the inherent ability to respond to and generate mathematical and logical operations. At the core of the design for the micro processor is a series of logical instructions that regulate the order that tasks are received and executed.
The random access memory or RAM most commonly refers to computer chips that temporarily store dynamic data to enhance computer performance. The computer can access the data faster than if it to retrieve it from the far larger hard drive. Random access memory is also used in printers and other devices. Random access memory is volatile memory, meaning it loses its contents once power is cut.
A hard drive, also known as a hard disk drive or HDD, is a fundamental part of modern computers. The hard drive is where all of your programs and files are stored, so if the drive is damaged for some reason, you will lose every thing on your computer. Hard drives contain round, mirror like platters that are covered with some magnetic recording medium. The platters inside a hard disk drive are usually made of glass or aluminum.
Monitors serve as a medium between the user and the computer. Now days they are mainly available in two types, which are the CRT and the LCD. CRT stands for cathode ray tube describing the technology inside, it readily recognizable by its bulky form. The CRT monitor creates a picture out of many rows or lines of tiny colored dots. These are technically not the same thing as pixels, but the terms are often used interchangeably. The more lines of dots per inch, the higher and clearer the resolution.
LCD stands for liquid crystal display, referring to the technology behind these popular flat panel monitors. LCD's are commonly one to three inches thick and weigh less than ten pounds. The LCD monitor consists of five layers, a back light, a sheet of polarized glass, a mask of colored pixels, a layer of liquid crystal solution responsive to a wired grid of x, y coordinates, and a second polarized sheet of glass.
By manipulating the orientations of crystals through precise electrical charges of varying degrees and voltages, the crystals act like tiny shutters, opening or closing in response to the stimulus, thereby allowing degrees of light that have passed through specific colored pixels to illuminate the screen. The LCD monitor is brighter than a CRT, giving the consumer little reason to hunt for an especially bright model. Brightness is measured in nits or one candela per square meter.