User:Dorone Ochieng/sandbox

Computer system is a collection of three components namely the hardware, software and the user that interact with each other to accept the process data, give meaningful outputs (information) and store it for future retrieval.

COMPUTER NETWORKING

Is a system in which multiple computers are connected to each other to share information and resources.

X-tics of a computer network

° share resources from one computer to another

° create files and store them in one computer from the other comp connected over the network

° connect a printer, scanner or a fax machine to one computer within the network and let other computer of the network use the machines available over the network.

SPREADSHEET.

Is a ledger sheet made up of raws and columns that enable the user to enter, edit and manipulate numeric data.

Types of spreadsheet

Manual spreadsheet : is a ledger book with several pages that is ruled into columns and rows and is manipulated with paper, pencil and eraser.

Electronic spreadsheet : is an application software divided into raws and columns to enable manipulation of data.

Examples of spreadsheet packages in market today.

• Quattro Pro

• Lotus 1 2 3

• VisiCalc

• SuperCalc

• Open Office.org Calc

• Gnumeric

 Terminology and parts of a computer 

Data: is a raw fact and figure that is meaningless to the user.

Processing: is transformation of data to a meaningful output called information.

Information: processed data that is meaningful to the user and can aid in decision making.

Computer: is an electronic device that accept the users input called data, process it under instructions called program to a desired output called information.

Major components of a computer system

Hardware: refers to all physical components of a computer system that are tangible.

Software: refers to step by step detailed instructions known as program that controls the computer hardware.

''' Basic hardware components of a computer system. '''

System unit: refers to the casing that houses the main components of the computer. Such as CPU, PSU, motherboard etc.

Peripheral devices: are the hardware devices that are connected to the computer system unit through interface cable via ports. They include; keyboard, mouse, monitor, printers, power cable, scanner and speakers.

Qualities of a computer

High speed

Accuracy

Reliability

Versatility

Mass storage capability

Precision

Security

Components found inside system unit

Motherboard

Main memory( RAM & ROM)

Internal hard disk drive

Power supply unit

Other drives eg. CD- drive, DVD-drive and Floppy disk drive.