General theory notes
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| hardware | is any physical part of a computer (it is a group of machines)
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| hardware is made up of | (a) The CPU and Main Memory
(b) Input Devices
(c) Output Devices
(d) Storage Devices
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| main memory | Stores programmes and Data for processing.
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| cpu | cpu stands for central processing unit
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| input device | These Devices read incoming Data and pass it on to the CPU. Example are : Keyboard, Disk Drive, Scanner, Bar Code Reader, Voice Recognition, and Digital Camera.
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| output device | These accept information from the CPU and displaying the results for ther user.
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| storage device | These keep information and instructions in the computer so that they can be used again. Examples are : CD’s, Floppy Disks, Hard Drive.
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| looking at input devices in more detail | Mouse Used to select text, insert text or an icon on a page by clicking and dragging. The cursor changes shape depending on the task. E.g. arrow, beam, egg timer shapes.
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| looking at input devices in more detail | keyboard Used to type words on the page.most common button is the spaced out one.
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| looking at input devices in more detail | bar code They read or scan the zebra like bars that you see on most products. The black and white bars are different widths and together they form a code called a UPC or Universal Product Code.
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| looking at input devices in more detail | Point of Sale Terminal They are used to collect information on a product by scanning the bar code.
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| looking at input devices in more detail | Digitiser Used for drawing illustrations or creating graphics/pictures on a page.
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| looking at input devices in more detail | Camera/Tape Recorder Used to Input voice or visual pictures on to your computer.
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| looking at input devices in more detail | VDE/Voice Data Entry I can accept human speech and convert it to the spoken word onto your screen.
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| looking at input devices in more detail | OCR/Optical Character Reader (optional scanner) They are devices that scan the document and turn it into readable form on your screen.
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| looking at input devices in more detail | MICR/Magnetic Ink Character Reader They are used when documents, contain magnetic digits that contain information.
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| looking at input devices in more detail | OMR/Optical Mark Recognition/Reader The computer will pick up marks, e.g. pencil marks on a sheet to collect information. E.g. Pencil mark on a score sheet.
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| looking at input devices in more detail | Touch Screen It is a special screen which allows you to carry out a task by touching on the screen.
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| looking at input devices in more detail | Light Pen or Stylus You can use a special pen to touch the ‘Touch screen’. It can be used to highlight and select items. You can also make hand written entries.
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| looking at ouput devices in more detail | Monitor/VDU Or Visual this is the screen that you look at; it containes a soft copy of your information
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| looking at ouput devices in more detail | flat screen technology's portable computers like laptops, notebooks, and PDA's or personal didgital assistants can have high resolution screens. the most common is the LCD or Liquid Crystal Display
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| looking at ouput devices in more detail | printer
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
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