Computer is defined as a combination of electro-mechanical devices (Hardware) capable of accepting data or information, processing, storing, and providing output under the control of some instructions and commands called programs (Software).
Computers are machines that perform tasks or calculation according to a set of instruction or programs. Introduce in 1940s the first fully electronic computers were huge machines that required teams of people to operate. Compared to those early computers, today’s computers are amazing, not only are they thousand of times faster, they can fit on your desk, in your lap, or even in your pocket.
Computers work through an interaction of hardware and software. Hardware refers to the parts of a computer that you can see and touch, including the case and everything inside it. The most important piece of hardware is a tiny rectangular chip inside your computer called the central processing unit (CPU) or microprocessor. It is the (brain) of the computer that translates instructions and performs calculations.
Computer performs three functions while processing data:- i. Input: the computer accepts data from outside for processing within. ii. Storage: computer holds data internally for processing within. iii. Processing: the computer performs operation on the data it holds within.
2. IMPORTANT COMPONENTS
The basic components of a desktop computer are the Power Cord, System Unit, Monitor, Keyboard, mouse, Diskette, Flash drives, Printer and Speakers. Each part plays an important role whenever a computer is being used.
[pic]A power cord connected to a surge protector
The power cord is the link between the power outlet and the power supply unit in the computer casing. If the power cord is not plugged in, the computer will not power on. To protect your computer from voltage spikes, you can plug the power cord into a surge protector.