Sub ICT: Computer And Computer System

What is a computer?

A computer is a general purpose machine which can receive data, store and process it and output information.

OR

A computer refers to an electronic machine which accepts data input, process it under instruction, stores, and outputs information.

Main Parts of a computer.

Monitor: Its used to display information in form of soft copy.

Keyboard: it is an input device used to enter text into the computer system by pressing buttons, or keys. It is the primary device used to enter text.

Mouse: it is used to control the movement of pointer on a screen

System Unit: it is used to house all internal components of a computer.

Speakers: it is used produce out sound from a computer.

CHARACTERISTICS OF MODERN COMPUTER

1. Speed: Computers are very fast in their operations. Their speed is measured in MIPs [ Million instructions per second]
2. Accuracy: Computers hardly make mistakes. Mistakes committed by computers are mainly caused by the user. Hence the saying garbage in garbage out (GIGO).
3. Storage: Computers keep user data / information for future use.
4. Diligence: Computers work on the same task over and over without getting bored or tired
5. Artificial intelligence: computers accept instructions and respond accordingly like humans.
6. Automation: Computers have the ability of working without human supervision.
7. Versatility: Computers have the ability of doing different or multiple tasks.
8. Communication: Networked computers have the ability to send and receive messages.

WHAT IS A COMPUTER SYSTEM?

A computer system is a collection of computer components , working together to input data (Raw Facts), store and output information.

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COMPONENTS  OF A COMPUTER SYSTEM

Components of a computer system include Hardware, Software, People (Computer User), Procedures and information

1. HARDWARE: This refers to all tangible / physical components of a computer. eg Monitor , keyboard, speaker.
2. SOFTWARE: This refers to set of instructions or programs which enables a computer to perform a specific task.
3. PEOPLE: These are computer users for example, Students, Accountants, Bank tellers , etc
4. PROCEDURES : This refers to the  steps or actions taken in order to accomplish a specific task.
5. INFORMATION: This refers to the processed data which is useful or has value to the end user.