GCSE Short Course ICT Theory Revision Notes

Exactly what it says on the tin - GCSE Short Course ICT Theory Revision Notes. You may find it useful to also do past papers and use these to help you. This is for the OCR Specification for the examination season of the summer 2009.

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  • Created on: 10-04-09 16:41
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ICT Short Course Revision Notes 2009
Jack Bennett, 11O
::Computer Systems::
Components and Types General Terms
Hardware is the physical parts of computers, e.g. CPU, monitor, keyboard, mouse,
printer etc.
The CPU (Central Processing Unit) is the brain of the computer consisting of the
control unit and arithmetic and logic unit, where all the work is done.
Software is the program containing the instructions that are followed by the
The main parts of a general-purpose computer are the CPU, internal memory,
secondary storage, input (and output) devices.
Secondary storage is the additional memory (e.g. disks), which is used to store data
and instructions that we may need to use. Fortunately, its contents are not lost
when the computer is turned off.
Type of Memory Equivalent Number of Bytes
Kilobyte (KB) 1,024
Megabyte (MB) 1,048,576
Gigabyte (GB) 1,073,741,824
Terabyte (TB) 1,099,511,627,776
Petabyte (PB) 1,125,899,906,842,624
The difference between portable and desktop computers is that the portable
computer is small, light and robust enough to be carried around, while the desktop
computer remains in one place in the home or office.
Keyboard: input device used for entering data of text and numbers.
Mouse: handheld input device which has buttons and is used as a pointer on the
screen for clicking on items to select them.
Trackerball: input device which behaves like an upside-down mouse.
Joystick: input device used for gaming, but can also be used as a mouse.
Touchpad: found inbuilt in laptops, behaving like a mouse by just using fingertips
over the pad.
A video digitaliser, digital camera and scanner are all input devices which capture

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ICT Short Course Revision Notes 2009
Jack Bennett, 11O
Video digitaliser: can capture film from video camera digitally.
Digital camera: stores images digitally without the need of a film.
Scanner: working principally the same as a photocopier, except the output is a digital
format of the original hard copy, stored directly to the computer. The more
dots-per-inch, the higher the resolution and the larger the data file.
Remote control: device which inputs data to computerised systems from a
distance using either infrared or Bluetooth.…read more

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ICT Short Course Revision Notes 2009
Jack Bennett, 11O
Magnetic tape is another type of storage media which before its decline, was
available in cassette form. They were frequently used for backups because they have
a larger storage capacity than a floppy disk.
CD-ROMs are capable of storing much more data than the old floppy disks and
magnetic tape. There are optical devices where a beam of laser light is used to access
the data.…read more

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ICT Short Course Revision Notes 2009
Jack Bennett, 11O
Videoconferencing allows groups of people to hold meetings large distances away
from each other. Teleconferencing is not used as commonly nowadays as
videoconferencing, but works on the same principle, except using sound instead of
Different data types are required for different situations. Examples of different
data types might include:
A field is an individual data item with a certain data type and perhaps a certain
format.…read more

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ICT Short Course Revision Notes 2009
Jack Bennett, 11O
However, some new jobs have obviously been created as a result of increased use of
ICT, such as computer repairers, user support staff, computer programmers etc.
Other jobs have been changed and it is increasingly necessary to train staff to do
different tasks on the computer.
Teleworking is when people have no need to go to the office. They can work from
home because of better computer technology and better communications.…read more

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ICT Short Course Revision Notes 2009
Jack Bennett, 11O
Common editing features are using cut and paste to move text (and other
manipulations of text) as well as changing existing characters.
Common formatting features are bold, italics, underline, centre, justify, borders,
tabs, font manipulations and margin adjustment.
Editing and formatting features such as online help, tables, drawing tools,
inserting objects (e.g. pictures), and mail merging are all common to both work
processors and desktop publishers.…read more

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ICT Short Course Revision Notes 2009
Jack Bennett, 11O
Clipart is a library of images which may come with the software or separately on a
CD of some sort.
CAD (Computer Aided Design) has additional features to assist designers when
they draw up plans. Graphics and CAD packages have many uses because of the way
images are manipulated. Filmmakers, publishers and designers find them to be
invaluable tools.
Spreadsheets and Databases
Editing and formatting features are available in both spreadsheets and databases.…read more

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ICT Short Course Revision Notes 2009
Jack Bennett, 11O
Data Logging, Programming and Control Software
Data logging is about automatically collecting all types of data, without the need for
a human operator ­ sensors are used to gather data by detecting all sorts of
conditions, they behave like input devices. Examples of sensors are light, sound,
pressure, temperature and humidity sensors.…read more

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ICT Short Course Revision Notes 2009
Jack Bennett, 11O
Internet browser software allows the users to search, store favourite webpage
addresses, keep a history of webpages visited, browse backwards or forwards
amongst the pages visited and return to the HOMEPAGE easily.
An intranet contains webpages which contain information about the organisation
such as dates of events, recent activities carried out, management structure, plan of
buildings and other internal news and information.
A directory structure has many subdirectories which have documents stored in
them.…read more



really useful :)

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