GSCE 1CT-page 22
1. The first 6 letters on a normal keyboard are ‘qwerty‘.
2. The difference between normal keyboard and concept keyboards is that concept keyboards are faster and more limited.
3. A mouse usually had two main parts,. There are usually two or three buttons, when the pointer is over an icon, menu item or the edge of a picture, the mouse buttons can be clicked or double clicked to give the computer a demand. A button can also be held down to drag something across the screen. Also mice tell the computer the direction and speed they are pushed. Older mice use a ball, the ball rotates when the mouse moves and sensors measured movement of the ball in two directions.
4. A difference between a touch-sensitive pad and a mouse is that touch-sensitive pads look like little screens that you move your finger across the pad and it moves the pointer.
5. When an image is put through a scanner it converts images into digital data.
6. OCR- optical character recognition.
MICR- magnetic ink character recognition
OMR- optical mark recognition
They are different because, MICR and OMR are used for registers where as OCR software can read text.
7. Microphones – they are used to put data into voice-recognition systems, which convert sound into text or commands for the computer. They are used to record sound so it can stored digitally and sent over the internet or e-mail.
The computer mouse is an input device that uses a graphical user interface. Computers that incorporate the graphical user interface into their system are able to use the computer mouse to maneuver around the computers different applications. The mouse is used in many different applications including engineering and computer games. When using the computer mouse with the graphical user interface you ...
Light pens – these work similar to touch screens except you can use the pen on the screen instead of your finger. They can be used to click menus, buttons and even draw pictures with special software.
Digital cameras – these are a bit like scanners. They save an image as a series of dots called pixels. The image can then be uploaded onto the computer and edited using photo-editing software. Most digital cameras can also record videos.
Laser scanners – used in supermarkets and libraries. They are used to read a bar code which contains data about the product being scanned.
Touch-sensitive screens – are a bit like concept keyboards. But, instead of pressing a key, you touch the picture or word on the screen. They’re used a lot in information centres and quiz machines in pubs.
Video digitisers – convert analogue video pictures from a videotape or video camera into digital images which can then be manipulated using imaging software. This is called image-grabbing. It allows you to add special effects to music videos that were originally shot in an analogue format.
8. Type text to create a letter – keyboard
Record a sound message to appear on a website – microphone
Take a photo of herself and email it to a friend – digital camera
10. You would use a dot-matrix printer to.. printing three copies of a sales invoice.
11. Laser printers are called page printers because the data to be printed is sent to the printer in complete pages – one page at a time. They work in very similar ways to photocopiers.
– very high resolution
– very fast
– expensive to repair
– cant use continuous or multi-part stationary
12. Ink-jet printers are most popular for both home and office use because they are the cheapest kind of printer but produce better quality print-outs than a dot-matrix.
13. Buffer – is memory that stores the pages that have not yet been printed. It is found inside the printer. This means the user can do other things whilst waiting for the document to be printed.
The discussion will take place first in Silas Marner novel. It is taken to be first since it needs full concentration of the reader. Two characters are going to be in redemption and re-generation, in their concepts and beliefs in life. The main character of the novel, which the plot builds on, is Silas Marner. His penance is him living lonely and cut off from the world for 15 years, till he finds ...
Spooling – is when the document to be printed is saved onto the hard disk before being held in a print-queue. This frees up the CPU to continue processing data. Again, this means the user can get on with other tasks without waiting for the printer.
14. The two main ways that VDUs differ from each other are;
Size – measured in inches across the diagonal. A typical general PC monitor has a size of at least 10 inches. Most laptops have a screen about 15 inches across.
Resolution – measured by the number of pixels or dots that make up the image viewed on the screen. Most new monitors can show a minimum of 1280×1024 pixels.
15. Speech synthesis is used by people who are visually impaired. It converts text into a sound through voice synthesizer.
16. – motors: are powered by an electricity supply
– hydraulic actuators: are powered by fluid pressure controlled by the computer
– pneumatic actuators: are like hydraulic ones but are powered by air pressure instead.
17. ROM – is permanent memory.
RAM – is temporary memory.
18. Four differences between hard and floppy discs:
– hard discs are found in computers where as floppy discs aren’t.
– hard discs are rigid circular plates that have been magnetised where as floppy discs are a circular piece of magnetised plastic protected by a hard plastic sleeve.
– hard discs contain a large capacity (hundreds and thousands of gigabytes) where as floppy discs contain a small capacity (1.4 megabytes).
– hard discs are very reliable where as floppy discs aren’t.
Isabella Cattini 11d