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.
Help!
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| Hardware | Is any physical part of a computer
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| Hardware is made up of | The CPU and Main Memory,Input Devices, Output Device, Storage Devices
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| Main memory | Stores Programmes and Data for processing
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| CPU | Central Processing Unit
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| Imput Devices | these Devices read incoming Data and pass it on to the CPU
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| Output devices | These Accept information from the CPU and display the result for the user.
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| Storage Devices | It keeps iformationin the computer so it can be used again.
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| Mouse | Used to select text,insert text or an icon on a page by clicking and dragging
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| Keyboard | Used to type words on the page. The most common type is a QWERTY keyboard. it is laid out in an 'unfriendly' manner.
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| Bar code reader / wand reader or scanner | They read or scan the zebra like bars that you see on most products.
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| Point of sale terminal | It is used to collect information on a product by scanning the bar code. they record and store information.
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| Digitiser | Used for drawing illustrations or creating graphics / pictures on a screen.
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| Camera/ tape recorder | used to imput voice or visual pictures on your computer
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| VDE/Voice Data Entry | It can accept human speech and convert it to the spoken word onto your screen
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| OCR/ Optical Character Reader | They are devices that scan the document and turn it into readable form on your screen. It can be text, graphics or photo material. The results can be cut, copied and pasted, then saved to a disk.
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| OCR/ Optical Character Reader (part 2) | Books, for example can be entered onto the computer without the need for keying in text. The scanner changes the text from paper onto your screen.
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| MICR/Magnetic Ink Character Reader | They are used in documents, contain magnetic digits that contain information. E.g. flat numbers on the bottom of a bank cheque that represents information about a customer's account
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| OMR/Optical Mark Recognition/Reader | The computer pick up marks, e.g. pencil marks on a sheet to collect information. E.g. Pencil marks on a score sheet
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| Touch screen | it is a special screen which allows you to carry out a task by touching on the screen. E.g. a point of information (POI) screen in a shopping centre, you can touch it to find out information about different levels/floors.
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| 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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| Monitor/VDU Or Visual Display Unit | This is the screen that you look at; it contains a soft copy of your information. (The copy of your work on the computer, rather then a hard copy, which is the copy that you have printed out on paper).
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| Monitor/VDU Or Visual Display Unit (part 2) | As you key in text, It appears on the monitor for you to see it. There are different types of monitors; one is the CRT or Cathode Ray Tube. They are similar to the picture tube in your TV.
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| Monitor/VDU Or Visual Display Unit (part 3) | They shoot little dots across the screen that light up tiny points that glow for a short period of time. Every letter/Character that you see on the screen is made of many of these lights or points called Pixels.
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| Flat Screen Technology's | portable computers like laptops, notebook, and PDA's or personal digital assistants can have high resolution screens. The most common is the LCD or liquid Crystal Display
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| Printer | They are used to produce a hard copy of your information. There are many types; the two main types are impact. The speed at which pages print, refers to the quality of print.
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| Printer 2 | When printing you should always check your print previews first, as 'what you see in the print view is what you get when you actually print, hence the term ; 'What you see, is what you get' - WYSIWYG
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| Non-Impact Printer | These printers cannot make carbon copies. Examples are: Thermal Printer: they respond to heat and create letters on special paper. They are slower than Ink-jet and the paper is expensive. Ink-jet printer: they shoot tiny dots of ink onto paper.
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| Non-Impact printer 2 | Laser printer; they beam whole pages at a time onto a drum, the paper then passes over the drum and picks up the image or text.
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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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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.
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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