Overview Of Computer System - SS1 ICT Past Questions and Answers - page 2

The CPU, or Central Processing Unit, serves as the "brain" of a computer. It is responsible for executing instructions and performing calculations required to run programs and process data.

The CPU consists of two main components: the arithmetic logic unit (ALU), which carries out mathematical and logical operations, and the control unit, which manages the execution of instructions and controls the flow of data within the computer's memory and other components.

Input Devices: Examples of input devices include keyboards, mice, touchscreens, and scanners. These devices allow users to provide data and commands to the computer. For instance, keyboards are used for typing text and entering commands, while mice are used for pointing and clicking on graphical interfaces.

 

Output Devices: Examples of output devices include monitors (displays), printers, and speakers. These devices present information generated by the computer to the user. Monitors display visual output, printers produce physical copies of documents, and speakers produce audio output.

 

System Software: System software refers to the software that manages and controls the computer hardware and provides a platform for application software to run. One of the primary components of system software is the operating system (e.g., Windows, macOS, Linux), which manages memory, processes, hardware interactions, and provides a user interface. Another example is device drivers, which facilitate communication between the OS and specific hardware components.

 

Application Software: Application software is designed for specific tasks or purposes. It includes programs such as word processors (e.g., Microsoft Word), spreadsheets (e.g., Microsoft Excel), graphics editors (e.g., Adobe Photoshop), web browsers (e.g., Google Chrome), and video players (e.g., VLC Media Player). Application software runs on top of the operating system and allows users to perform various functions, such as creating documents, editing images, browsing the internet, and more.