Information Technology Harsha S. Wijethunga Dip in NIBM, ASLIM, Dip. In HRM, HND in Computer System Design
COMPUTER BASIC PART MONITOR SPEAKER KEYBOARD MOUSE CPU CD-Drive DVD Drive Floppy Drive Flash drive INPUT DEVICE OUTPUT DEV...
WHAT IS THE COMPUTER <ul><li>A computer is a  programmable  </li></ul><ul><li>electronic device  that can  store,  </li></...
WHAT IS COMPUTER DATA & INFORMATION INPUT CPU MAIN MEMORY OUTPUT DATA INFORMATION
<ul><li>DATA </li></ul><ul><li>Input user or other users </li></ul><ul><li>May be  Number, text, Sound ,Image </li></ul><u...
 
What is a Computer? <ul><li>A  computer  is an electronic device that manipulates information or &quot;data.&quot; It has ...
<ul><li>Whether you realize it or not,  computers  play an important role in our lives. When you withdraw cash from an ATM...
Software and Hardware If you use a player piano as an analogy, the piano can be thought of as the hardware and the roll of...
<ul><li>Input Devices –  </li></ul><ul><li>&quot;How to tell it what to do&quot; </li></ul><ul><li>A keyboard and mouse ar...
<ul><li>Output Devices --  &quot;How it shows you what it is doing&quot;   </li></ul><ul><li>The monitor (the screen) is h...
Peripheral device   I nput/output <ul><li>Input </li></ul><ul><li>Mouse ,  Keyboard ,  Joystick ,  Imagescanner ,  Webcam ...
What is “hardware” ? <ul><li>All the bits that plug together are hardware </li></ul><ul><ul><li>System Unit </li></ul></ul...
What is “software” ? <ul><li>Computer programs and applications are software </li></ul><ul><li>They enable the computer to...
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Information Technology

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  • To turn the slides you can either: Click once on the left mouse button Press the [Enter] key on the keyboard Use the [Page Down] key – to move to the next slide Use the [Page Up] key – to move back a slide
  • Hardware is all the equipment that you can touch and see The system unit is the main computer box containing the processor and memory. All the bits that plug into the system unit are called “peripherals”. Input devices: The keyboard – familiarise yourself with the position of the different keys. The more you use the keyboard, the quicker the typing will become! The mouse, the trackball and the touchpad – all respond to hand movement. The mouse activates on a button click and the trackball activates on a keyboard press. Text and graphical information can also be scanned into your computer where it can then be manipulated and saved. Output devices: The computer’s display is known as the “VDU” (Visual Display Unit), screen or monitor. The screen usually has its own independent power on/off button and controls, similar to those of a television, to adjust the picture’s brightness, contrast, colour, position and shape The printer and plotter both give a “hard copy” of results. The “inkjet” printer character is composed of thousands of dots measures in dots per inch (DPI) – the more dots, the greater the clarity of the print. The laser printer files the shape of the character at a rotating metal drum, toner is then heat-sealed onto the paper and gives the best results. Speakers and speech synthesisers give the computer an audio facility.
  • Forget about computers for a moment; when you have an idea that you want to get down onto paper, if it is a rough note, you will probably choose a pencil; if it is a letter, you will probably choose a pen; if it is a painting, you will probably choose a paintbrush. You select the best tool for the task. Software is a computer tool. When you turn the computer on, it goes though POST, loads Windows and then comes to a grinding halt. It is then up to you to decide what you want to do on the computer, and choose the best software tool for the task. As technology advances, so new “versions” of software are released. Be aware that a document created in a newer version of the software might not open in an older version - because the older version doesn’t contain all of the functionality necessary to run that document.
  • Information Technology

    1. 1. Information Technology Harsha S. Wijethunga Dip in NIBM, ASLIM, Dip. In HRM, HND in Computer System Design
    2. 2. COMPUTER BASIC PART MONITOR SPEAKER KEYBOARD MOUSE CPU CD-Drive DVD Drive Floppy Drive Flash drive INPUT DEVICE OUTPUT DEVICE SYSTEM UNIT
    3. 3. WHAT IS THE COMPUTER <ul><li>A computer is a programmable </li></ul><ul><li>electronic device that can store, </li></ul><ul><li>retrieve, and process data. </li></ul><ul><li>Computer is an electronic device that </li></ul><ul><li>accepts the data. Process it and give </li></ul><ul><li>the result. </li></ul>
    4. 4. WHAT IS COMPUTER DATA & INFORMATION INPUT CPU MAIN MEMORY OUTPUT DATA INFORMATION
    5. 5. <ul><li>DATA </li></ul><ul><li>Input user or other users </li></ul><ul><li>May be Number, text, Sound ,Image </li></ul><ul><li>May be unintelligible </li></ul><ul><li>Maybe command or instruction </li></ul><ul><li>INFORMATION </li></ul><ul><li>Out put from the computer </li></ul><ul><li>Is formatted and understandable </li></ul><ul><li>Can be printed text, graphics, images </li></ul><ul><li>Can be sounds or video </li></ul>
    6. 7. What is a Computer? <ul><li>A computer is an electronic device that manipulates information or &quot;data.&quot; It has the ability to store , retrieve , and process data. You can use a computer to type documents, send email, and surf the Internet. You can also use it to handle spreadsheets, accounting, database management, presentations, games, and more . </li></ul>
    7. 8. <ul><li>Whether you realize it or not, computers play an important role in our lives. When you withdraw cash from an ATM, scan groceries at the store, or use a calculator, you're using a type of computer. </li></ul>
    8. 9. Software and Hardware If you use a player piano as an analogy, the piano can be thought of as the hardware and the roll of music as the software. The software a series of very simple computer instructions carefully organized to complete complex tasks. These instructions are written in programming languages (like BASIC, PASCAL, C...) to help simplify the development of applications. The hardware is what sits on your desk and executes the software instructions. The player piano is useless unless the roll of music has been written correctly.
    9. 10. <ul><li>Input Devices – </li></ul><ul><li>&quot;How to tell it what to do&quot; </li></ul><ul><li>A keyboard and mouse are the standard way </li></ul><ul><li>to interact with the computer. Other devices </li></ul><ul><li>include joysticks and game pads used primarly </li></ul><ul><li>for games. </li></ul>Mouse , Keyboard , Joystick , Image Scanner , Webcam , Graphics tablet , Microphone , Light Pen, MICR, OCR, Bar Code Reader
    10. 11. <ul><li>Output Devices -- &quot;How it shows you what it is doing&quot; </li></ul><ul><li>The monitor (the screen) is how the </li></ul><ul><li>computer sends information back to you, </li></ul><ul><li>whether it be surfing the web or writing a </li></ul><ul><li>memo. A printer is also an output device. </li></ul>Monitor , Printer , S peaker , Head Phone , Plotter
    11. 12. Peripheral device I nput/output <ul><li>Input </li></ul><ul><li>Mouse , Keyboard , Joystick , Imagescanner , Webcam , </li></ul><ul><li>Graphics tablet , Microphone </li></ul><ul><li>Output </li></ul><ul><li>Monitor , Printer , Loudspeaker </li></ul><ul><li>Both </li></ul><ul><li>Floppy disk drive , Hard disk drive , Optical disc drive , </li></ul><ul><li>Teleprinter </li></ul>
    12. 13. What is “hardware” ? <ul><li>All the bits that plug together are hardware </li></ul><ul><ul><li>System Unit </li></ul></ul><ul><ul><li>Screen </li></ul></ul><ul><ul><li>Keyboard </li></ul></ul><ul><ul><li>Mouse </li></ul></ul><ul><ul><li>Printer </li></ul></ul><ul><ul><li>Scanner etc </li></ul></ul>
    13. 14. What is “software” ? <ul><li>Computer programs and applications are software </li></ul><ul><li>They enable the computer to carry out the tasks we need </li></ul><ul><li>It is important to choose the right software for the job… </li></ul>Spreadsheet Word Processor Presentation Letter Report

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