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Knowledge of ICT Components
Blu-ray A high capacity optical storage medium that uses a blue laser for data recording
Cache Memory The type of memory used by the CPU. Cache memory is similar to RAM
in that instructions can be read or written. It is small in capacity compared to RAM but has
faster access speeds. Its purpose is to store frequently accessed program instructions.
Character A character is a letter, a digit, a punctuation mark, a symbol or a control code
that can be stored by a computer. Each character is stored in digital format referred to as a
Concept keyboard A keyboard that can use a variety of programmed overlays. The
overlays allow the keys to be defined as words and/or pictures.
External memory This refers to memory devices that are connected to thee computer
system and includes hard drives, DVD drives, USB memory pens and Blu-ray disks. They allow
programs data to be stored permanently.
Function key Keys labelled with F followed by a number found along the top of a qwerty
keyboard. They are programmed to carry out a user task.
Hot key This is known as a shortcut. It allows the user to use two or more keys to carry
out a task as an alternative to using a mouse and menu. For example ctrl+p to print.
Infrared Used to send data between computers and other devices, such as Personal
Digital Assistance, over short distances. Also used with remote control devices where
signals are generated using Light Emitting Diodes.
Internal memory The memory inside the CPU. RAM and ROM are examples of internal
Joystick An input device consisting of a lever and a number of pre-programmed buttons
to allow the user to interact with the computer environment.
Magnetic disk The primary computer storage device. Magnetic disks can record data an
can re-record data over and over again. They use read/write heads to record and access data.
Memory card A memory card, sometimes called a flash memory card is a small storage
medium used to store data for use on portable devices such as digital cameras.
Microphone An input device used to convert analogue sound waves into digital format.
Motherboard The main printed circuit board in the computer, which contains the CPU,
memory boards and the circuit boards required by a computer system.
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Multimedia The combination of text, graphics, voice, video and sound to produce a
presentation or a website.
Operating system A software package that manages the computer system functions
including allocating software and hardware to jobs, managing memory allocation fo tasks
requiring processing and managing overall system security.
Optical disk Disks that are written and read by laser light. CD and DVD are examples of
optical disks. Some disks are classified as R (recordable) and RW (reweriteable).…read more
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User interface A system that allows users to interact with a computer system. It
provides a means of allowing users to input data and instructions, and the computer to
communicate or output results. GUI is a commonly used interface.
Wireless link This allows a device to connect and communicate with another device using
radio signals such as Wi-Fi networks. Wireless devices can both receive and transmit signals.…read more