Java Games: Flashcards, matching, concentration, and word search.

Lesson 02 - Hardware

active-matrix displayType of flat-panel display in which each pixel on the screen is controlled by its own transistor.
arithmetic/logic unit (ALU)The part of the CPU that performs arithmetic operations and logical operations and that controls the speed of those operations.
audio boardType of audio-input device; add-on circuit board in a computer that converts analog sound to digital sound and stores it for further processing.
audio-input deviceDevice that records or plays analog sound and translates it for digital storage and processing.
audio-output deviceDevice that outputs voice or voice-like sounds (voice-output technology) or that outputs music and other sounds (sound-output technology).
backupName given to a diskette (or tape or hard-disk cartridge) that contains duplicates, or copies, of files on another form of storage.
bar-codeVertical striped marks of varying widths that are imprinted on retail products and other items; when scanned by a bar-code reader, the code is converted into computer-acceptable digital input.
bar-code readerPhotoelectric scanner, found in many supermarkets, that translates bar code symbols on products into digital code.
binary systemA two-state system.
biometricsScience of measuring individual body characteristics.
BitShort for binary digit, which is either a 1 or a 0 in the binary system of data representation in computer systems.
bitmapIn computer graphics, an area in memory that represents an image. Depending on the screen, 1 or several bits represent 1 pixel or several pixels of the image.
Bubble jet printerNon impact printer that uses miniature heating elements to force specially formulated inks
busElectrical pathway through which bits are transmitted within the CPU and between the CPU and other devices in the system unit. There are different types of buses (address bus, control bus, data bus, input/output bus).
byteA group of 8 bits.
cache memorySpecial high-speed memory area on a chip that the CPU can access quickly. A copy of the most frequently used instructions is kept in the cache memory so the CPU can look there first.
carpal tunnel syndrome (CTS)Type of repetitive strain injury; condition caused by pressure on the median nerve in the wrist, producing damage and pain to nerves and tendons in the hands.
cartridge tape unitsAlso called tape streamers; secondary storage used to back up data from a hard disk onto a tape cartridge.
cathode-ray tube (CRT)Vacuum tube used as a display screen in a computer or video display terminal. Images are represented on the screen by individual dots or "picture elements" called pixels.
CD Plus/Enhanced CDDigital disk that is a hybrid of audio-only compact disk and multimedia CD-ROM.
CD-ROM (compact disk-read only memory)Compact optical disk that holds text, graphics, and sound.
central processing unit (CPU)The processor; it controls and manipulates data to produce information. In a microcomputer the CPU is usually contained on a single integrated circuit or chip called a microprocessor. This chip and other components that make it work are mounted on a circuit board called a system board. In larger computers the CPU is contained on one or several circuit boards. The CPU consists of two parts: (1) the control unit and (2) the arithmetic/logic unit. The two components are connected by a bus.
character-mapFixed location on a video display screen where a predetermined character can be placed. Character-mapped display screens display only text-letters, numbers, and special characters (as opposed to bitmapped display screens).
chip (microchip)Microscopic piece of silicon that contains thousands of micro miniature electronic circuit components, mainly transistors.
client/server networkNetwork consisting of central computer (server) that holds databases and programs for PCs, workstations, or terminals (clients).


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