essential computing concepts
Skip this Video
Download Presentation
Essential Computing Concepts

Loading in 2 Seconds...

play fullscreen
1 / 18

Essential Computing Concepts - PowerPoint PPT Presentation

  • Uploaded on

Essential Computing Concepts. Information System An Information System has the following parts:. People : the most important part Hardware : consists of the equipment: keyboard, monitor, etc…

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'Essential Computing Concepts' - maura

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Information System

An Information System has the following parts:

  • People: the most important part
  • Hardware: consists of the equipment: keyboard, monitor, etc…
  • Software: refers to the programs and its purpose is to convert data into information
  • Data: unprocessed facts, and once processed, it becomes information
  • Procedures: guidelines for people to follow when using software, hardware, and data
what is a computer




What is a Computer?
Any Computer System

Central processing unit





Secondary Storage Devices

Hard Disk

the main parts of a pc include
The Main Parts of a PC include:
  • The System Unit
    • CPU
    • Memory or RAM (Primary Storage)
  • Input / Output Devices
  • Secondary storage devices
  • Communication Devices
the cpu
  • Central Processing Unit (or processor)
  • The brain of the computer
  • Does all the calculation and processing
input devices
Input Devices
  • Mouse
  • Keyboard
  • Scanner, video camera, etc.
output devices
Output Devices
  • Monitor/Screen (VDU – Visual Display Unit)
  • Printers
    • Laser printers
    • Inkjet printers
  • Plotters, speakers etc.
secondary storage devices
Secondary Storage Devices
  • Provide Permanent Storage
  • Common Storage Devices:
    • Hard (Fixed) Disk :Consists of 1 or more rigid metal platters coated with a metal oxide material for recording.
    • Floppy disk :Consists of thin, circular, flexible plastic disk with magnetic coating.
    • CD (Compact Disk) :Flat, round, portable, metal storage. Uses laser technology.
    • DVD (Digital Versatile Disk)




storage capacity
Storage Capacity
  • The amount of information that can be stored in a secondary storage device or in memory
  • A Bit (short for Binary digit) is the smallest unit of storage in the computer. It represents a pulse of electricity: Off = 0, On = 1
  • All numbers in the computer must be represented by Bits (0 or 1). We cannot do this with decimal numbers, so instead we use binary numbers.
bits bytes
Bits & Bytes
  • Bit:
    • All computers work on a binary numbering system, i.e. they process data in one's or zero's. This 1 or 0 level of storage is called a bit.
  • Byte:
    • A byte consists of eight bits. A character needs one Byte of storage.
  • Kilobyte:
    • A kilobyte (KB) consists of 1024 bytes, approx 1,000 bytes.
  • Megabyte:
    • A megabyte (MB) consists of 1024 kilobytes approx 1,000,000 bytes.
  • Gigabyte:
    • A gigabyte (GB) consists of 1024 megabytes approx 1,000,000,000 bytes.
storage capacities
Storage Capacities

Temporary Storage

  • Random Access Memory (RAM) 256MB

Permanent Storage

  • Hard Disk 40 – 80 GB
  • CD (Compact Disk) about 700 MB
  • DVD (Digital Versatile Disk) 8.5 GB
  • Floppy Disk 1.44 MB
Types of Computers
  • Supercomputer: The fastest and most expensive high-capacity computers used by very large organizations
  • Mainframe: Large computers, capable of great processing speeds and data storage
  • Minicomputer: midrange computers used by medium-sized companies
  • Microcomputer: Least powerful, small computers, but most widely used (desktop, Notebook or laptop, and Personal DigitalAssistants)
Computer = Hardware + Software
  • Hardware : The Equipment
  • Software : The Programs. A program is a set of instructions which tell the computer how to do its work
types of software
Types of Software
  • System Software : Programs to control the operation of the computer.
    • e.g. Operating System (Windows, Unix, Linux etc),

Utility Programs, Device Drivers

  • Application Software : Programs for various applications.
    • e.g. Programs for word processing, business, scientific and other applications such as Microsoft Office which consists of MS Word, MS Excel etc.
Types of Software

E.g. Operating system such as Windows XP



S / W




E.g. End-user programs such as MS Word

Occupational Health & Safety
  • Using the computer for long periods of time, may pose risk to health.
  • Check the following:
  • Position of the monitor – Frame above screen should be level with eyes, so
  • that you look slightly down. Distance should be less than an arm’s length.
  • Avoid screen reflection and flickering.
  • Posture of the user – Chair back upright, lower back supported, feet flat on
  • floor, Forearms should be horizontal, wrists straight and task materials
  • within comfortable reach of both hands.
  • Preventive exercisesshould be done before starting and during work.
  • Eyes: Take frequent short rests: Look away from screen towards objects
  • 20-30 ft away, or look outside the window far out, or close your eyes.
  • Muscles: Do neck exercises. After every hour walk around, stretch
  • all muscles and perform whatever relieves the feeling of muscle fatigue/strain
  • Suggested reading: