عدد الرسائل
من طرف Nahla الأربعاء أبريل 23, 2008 5:53 pmMain Components of the Computer
Introduction of the computer:
Computer, machine that performs tasks, such as calculations or electronic communication, under the control of a set of instructions called a program. Programs usually reside within the computer and are retrieved and processed by the computer’s electronics. The program results are stored or routed to output devices, such as video display monitors or printers. Computers perform a wide variety of activities reliably, accurately, and quickly.
Computer components:
Computers are divided into two parts hardware & software.
All the parts of the computer that can be seen and touched are classified as Hardware, such as the keyboard, CPU, monitor … etc.. The other parts that can be seen, but can't be touched are classified as Software, such as programs.
Computer Hardware:
The physical computer and its components are known as hardware. Computer hardware includes the memory that stores data and program instructions; the central processing unit (CPU) that carries out program instructions; the input devices, such as a keyboard or mouse, that allow the user to communicate with the computer; the output devices, such as printers and video display monitors, that enable the computer to present information to the user; and buses (hardware lines or wires) that connect these and other computer components; secondary storage units, such as hard disk, that stores data permanently inside the computer for a long time.
Computer software
The programs that run the computer are called software.
Software generally is designed to perform a particular type of task—for example, to control the arm of a robot to weld a car’s body, to write a letter, to display and modify a photograph, or to direct the general operation of the computer.
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