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    HARDWARE BASICS

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    Muhammad Mubarak

    Posts : 49
    Join date : 2013-11-09
    Age : 31
    Location : Lagos

    HARDWARE BASICS

    Post by Muhammad Mubarak on Fri Dec 13, 2013 1:47 am

    HARDWARE BASICS (PERIPHERAL)
    Peripherals are the external devices that are attached to the system unit of the computer. They are mainly input and output devices e.g. keyboard, mouse, printer, scanner etc.
    INPUT DEVICES
    Input devices are used to enter data or instruction into a computer. Examples are:
    • Mouse and keyboard
    • Digital camera and digital video camera
    • Biometric authentication device
    • Touch screen
    • Scanner
    OUTPUT DEVICES
    These are the medium through which the computer communicate, the result of processing data i.e. information to the users. Examples are monitor, printers, speakers and projector.
    CATEGORIES OF KEYBOARD
    • Alphanumeric keys (A-Z and 0-9)
    • Navigation key e.g. page up, page down, home, end etc.
    • Functions key e.g. F1-F12
    • Special keys e.g. ctrl, shift, enter, space etc.
    MONITOR AND PROJECTORS
    The most importance difference between monitor types is the technology used to create an image: Cathode ray tube (CRT) monitor is the most common monitor type, most television also use this technology. Liquid crystal display ( LCD) is commonly used in laptops and some projectors. LCD comes in two forms namely:
    1. Active matrix
    2. Passive matrix
    Digital light processing (DLP) is another technology used in projectors.


    OTHER OUTPUT DEVICES
    Printers
    Scanners
    Fax
    Machines printers are output devices that create hard copies of computer files. Other all in one type printer are designed to provide multiple services such as printing, fax, copier functions.
    Printer produces paper copies of electronic files. Hard copy of computer document remain important today. Scanners allow users to concert paper document into electronic files.
    TYPES OF PRINTERS
    Computer technician should know how to purchase, repair or maintain a printer.
    Printers available today are:-
    Laser printer: It is the using of electro-photographic technology
    Inkjet printer: It is the using of electrostatic spray technology
    Dot matrix printer: It is the using of impact technology used in applications that requires multiple “carbon” copies.

    Types of Scanner
     All in one scanner
     Flat bed scanner
     Drum scanner
     Handheld scanner


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