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I.C.T.
General theory notes
| Term | Definition |
|---|---|
| Hardware | is any physical part of a computer (it is a group of machines) |
| Hardware is made up of | The CPU and Main memory, Input Devices, Output Devices, Storage Devices |
| Main Memory | stores programmes and data for processing |
| CPU | stands for central prpcessing unit |
| Input Device | These devices read incoming data and pass it on to the CPU |
| Output Devices | These accept information from the CPU and display the results for the user |
| Storage Devices | these keep information and instructions in the computer so that they can be used again |
| Mouse | Is Used to select text, insert text or an icon on a page by clicking and dragging |
| Keyboard | Used to type words on a page |
| Bar code | They read or scan the zebra like bars that you see on most products |
| Reader/Wand | They are used in supermarkets where the bar code on the item is scanned and the products information is read, e.g. its price. |
| Reader or Scanner | This scanner is often connected to a POS or point of sale terminal called an electronic cash register |
| Point of sale Terminal | They are used to collect information on a product by scanning a bar code |
| Digitiser | Used for drawing illustrations or creating graphics/pictures on a page. |
| Camera/Tape Recorder | Used to input voice or visual pictures on to your computer |
| VDE/Voice Data Entry | It can accept human speech and convert it to the spoken word onto your screen. |
| OCR/Optical Character reader (optical scanner) | They are devices that scan the document and turn it into readable form your screen |
| MICR/Magnetic Ink Character Reader | They are used when documents, contain magnetic digits that contain information |
| OMR/Optical mark Recognition/Reader | The computer will pick up marks, e.g. pencil marks on a sheet to collect information |
| Touch Screen | It is a special screen which allows you to carry out a task by touching on the screen |
| Light Pen or Stylus | You can use a special pen to touch the touch screen |
| Monitor/VDU or visual Dusplay unit: | This is the screen that you look at: it contains a soft copy of your information. |
| Flat screen Technologys; | Portable computers like laotops, notebooks, and PDA's |
| Printer | They are used to print a hard copy of your information |
| Impact printer | They are slower, noiser and often break down, they are more inexpensive |
| Plotter | They are printing devices that produce a high quality image for drawings |
| Audio Responce | Used to provied verbal responces using a voice simulater or pre-recorded messages |
| Microfiche/film | When large amounts of information needs to be stored |
| Speaker | Sends out audio/sound |
| Digital Projector | Displays the monitors image on a large screen/wall |
| Hard Disc | This is a permanent disc inside the tower of your computer that you can store information to, called the C drive. |
| Byte | This is a letter or a symbol, A kilobyte is 1024 bytes. A megabyte is 1 million bytes. A gigabyte is 1 Billion bytes. |
| Speed | The speed of this memory is measured in nanoseconds or billionths of a second. We use the symbol MHz or megahertz when describing speed. |
| MIPS | Millions of instructions per second, or the speed and memory size together. |
| Ergonomics | This relates to any Health and Safety issues relating to PC Use. |
Created by:
JackWalsh10
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