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24 Cards in this Set
- Front
- Back
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What is Information Technology?
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the term used to describe equipment and programs that allows us to access, retreive, convert, store, organize, manipulate and present data.
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What is software?
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software are the instructions given to the CPU in order for it to carry out its functions
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What is the difference between data and information?
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data is whatever the computer takes in as raw material to complete a job while information is the end product of data processing
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What are the 4 parts that the CPU is divided into?
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1.control unit 2.ALU 3.CPU clock 4.bus and registers
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What are input devices?
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devices used to transfer data to the computer
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Give the two categories of input devices
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1.manual input devices and direct data entry devices
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Give 3 egs. of input devices and their functions
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keyboard-transfer text documents to the computer
mouse-controls the onscreen pointer joystick-used for playing computer games |
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What are storage devices?
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devices and media that are used to store data/information
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Give the two types of storage devices
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magnetic and optical storage
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Give the two types of magnetic media.
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magneic tape and magnetic disk
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Descirbe the magnetic tape
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it is a continuous strip of plastic which is divided lenghtwise into tracks and vetically into sectors
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Give the 3 types of magnetic disks
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floppy disks, zip/jazz disk, hard or fixed disk
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What is the capacity of a floppy disk?
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1.44 megabytes
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What does optical storage use to read and write data information?
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light source-LASER- light amplification by stimulated emission of radiation
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How much data
can a DVD hold? |
17 gigabytes or 26 cd roms
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What does WORM stand for?
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write once read many
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What does CPU mean?
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central processing unit
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What does CD-ROM stand for?
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compact disk recordable
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Describe a floppy disk
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the surface of it is divided into concentric cicles called tracks.The disk is divided from teh center outwards into wedge shaped sectors. It is made from plastic with a magnetic strip and it is portable
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A CD-compact disk has a capacity of what?
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700 megabytes of data or 80 mins of audio
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What is a barcode reader?
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a scanner used to read or interpret data on a barcode
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What does OMR stand for and what is its function
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optical mark reader and it recognises a mark made by a pencil or pen at a specific position on a form
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What scans text into a file that can be edited by a word processor?
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optical character reader
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The magnetic ink character reader reads datafound on cheques.It is used at banks for the sorting and processing of cheques.The numbes written at the bottom of teh cheque are called what?
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magnetic characters
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