Term
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Definition
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Term
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Definition
- moniter
- mouse
- printer
- keyboard |
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Term
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Definition
| programs used on the computer |
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Term
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Definition
- operating systems
- word processors
- database
- spreadsheet |
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Term
| the main hardware that makes up a computer are... |
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Definition
- CPU
- internal memory
- backing storage (input/output) |
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Term
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Definition
| a general purpose machine found in many offices and homes. It is designed to stay in place whilst notebook (or portable) has the same power and capability but is designed to be around |
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Term
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Definition
| computers are much smaller devices. PDAs have a variety of applications such as email, memos, phonebooks, calendars and in some cases there are built in mobile phones |
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Term
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Definition
| Central Processing Unit - the 'brain' of the computer consisting of the control unit and arithmetic and logic unit, where all the work is done. |
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Term
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Definition
| the computer screen, also called the moniter |
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Term
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Definition
| holds the current data and instruction being dealt with by the computer |
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Term
| Secondary (or backing) storage |
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Definition
| is the additional memory which is used to store data and instructions that we may need to use again and again. Its contents are not lost when the computer is switched off. |
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Term
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Definition
| an item of hardware a person uses to put data and instructions into the computer |
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Term
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Definition
...are input devices, which look a bit like a typewriters and are most commonly used for data entry such as typing in text.
...are very common, but data is not entered quickly, esp if the user is not experienced |
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Term
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Definition
P - most computers have them, and a skilled typist can enter data quickly
C - it is easy to make mistakes
C - it can be time consuming
C - it can be difficult to enter data (diagrams/pictures)
C - repititive strain injury (constant typing) |
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Term
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Definition
| a handheld device used to select items or start tasks by pointing or clicking on displayed items. |
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Term
| touch pads (and tracker balls) |
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Definition
| are similar to the mouse and are used in a similar manner, and are often found on notebooks. |
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Term
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Definition
| is similar to tracker ball except that control of the pointer is by moving the stick rather than a ball. |
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Term
| Uses, Pros and Cons (of joysticks) |
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Definition
U - game software
P - immediate feel of direction
C - sometimes difficult to control
C - can break easily, not strong |
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Term
| a video digitiser, digital camera and scanner |
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Definition
| are all input devices which capture images |
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Term
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Definition
| a camara which does not need film; instead images are captured and stored immediately onto digital format. This data can then be put straight into the computer for display |
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Term
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Definition
| a device which copies images and text and converts them to digital format to be stored in computer memory |
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Term
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Definition
| ...take up a lot of space in computer memory because data has to be stored about each dot on a picture; the more dots per square inch the higher the resoloution, the larger the data file. |
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Term
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Definition
| a device that inputs data to a computerised system from a distance using infrared |
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Term
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Definition
| are ouput devices that produce a permament copy of output on paper. |
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Term
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Definition
- laser
- ink-jet
- dot-matrix |
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Term
| laser and ink-jet printers.. |
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Definition
| ...are higher quality than dot-matrix printers but are more expensive |
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Term
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Definition
| ...are output devices which usually use pen to produce line diagrams such as building plans, although there are plotters which are 'pen-less' an are capable of producing more detailed drawings |
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Term
| examples of controlled devices... |
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Definition
- lights
- buzzers
- motors |
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Term
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Definition
| ... are all devices that respond to electrical signals produced by the computer. |
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Term
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Definition
| known as immediate access storage (IAS is the RAM part of main memory), is volatile but seconadry (backing) storage is non-volatile. |
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Term
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Definition
| ...and their drives often provide secondar storage, especially on desktop and notebook computers. |
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Term
| Hard disks have the capability of storing ....small/medium/large amount of data |
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Definition
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Term
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Definition
| are in mainframe computers were the hard disks come as a stack all together aka disk packs |
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Term
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Definition
... are small and portable and are therefore often used for the user's own personal data
... a high density (HD) disk stores approx 1.5MB of data
...they are 3.5inches square |
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Term
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Definition
| is another type of storage medium abd today it comes in cassette form. it is frequently ised for back-ups because it has larger storage capacity than a floppy disk. |
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Term
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Definition
...are capable of storing 650MB of data, and are portable and read only so they are ideal for reference material, such as multimedia encyclopaedias.
...are an optical devicewhere a beam of laser light is used to access the dat. |
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Term
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Definition
| ...are similar to CD-ROMs because they are optical devices and are used for storing large amounts of multimedia particularly films. |
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Term
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Definition
- eye strain
- RSI
- Back problems
- fire extinguishers
- trailing wires
- overcrowding electrical points
- 10minute break every two hours |
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Term
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Definition
| ...can be prevented by providing diffused overheadlighting and suitablewindow blinds |
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Term
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Definition
...is the strain of the upper limbs.
...it can be prevented by well-designed keyboards and wrist supports |
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Term
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Definition
| ...can be prevented by providing adjustable screens and chairs |
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Term
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Definition
| ...products are bought from one or two suppliers ans then resold in school at break and lunch times. |
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