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Essential Intro. To Computes
pgs COM8-COM13
26
Computer Science
10th Grade
09/10/2007

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Term
Memory
Definition
Also called random access memory, or RAM. It consists of electronic components that temporarily store instructions waiting to be executed by the processor, data needed by those instructions, and the results of processed data (information).
Term
Kilobyte (KB)
Definition
It equals 1,000 bytes.
Term
Megabyte (MB)
Definition
It equals one million bytes.
Term
Byte
Definition
One memory location or one character.
Term
Impact Printer
Definition
Prints by striking an ink ribbon against the paper. One type of impact printer is the matrix printer.
Term
Non-Impact Printer
Definition
Print by means other than striking a ribbon against paper. Examples: Ink Jet and Laser.
Term
Ink Jet
Definition
Form characters or graphics by using a nozzle that sprays tiny drops of ink onto the page.
Term
Laser Printer
Definition
Is a high-speed, high-quality, nonimpact printer that employs copier-machine technology. It converts data from the computer into a bean of light that is focused on a photoconductor drum, forming the images to be printed.
Term
PPM
Definition
Number of pages per minute.
Term
PPM
Definition
Number of pages per minute.
Term
Display Device
Definition
Output device that visually conveys text, graphics, and video information.
Term
Monitor
Definition
A display device that is packaged as a separate unit.
Term
Flat Panel Monitor
Definition
LCD monitor that is the most popular type of flat panel monitor, using liquid display crystal, similar to digital watch, to produce images on the screen.
Term
CRT
Definition
Cathode Ray Tube, the surface of the screen is composed of individual picture elements called pixels.
Term
Pixel
Definition
Individual picture element.
Term
Storage Devices
Definition
Is used to store instructions, data, and information when they are not being used in memory.
Term
Magnetic Disks
Definition
Use magnetic particles to store items such as data, instructions, and information on a disk's surface.
Term
Formatting
Definition
The process of dividing the disk into tracks and sectors, so the computer can locate the data, instructions, and information on the disk.
Term
Track
Definition
Narrow recording band that forms a full circle on the surface of the disk.
Term
Sectors
Definition
The disk's storage locations consist of pie-shaped sections, which break the tracks into small arcs.
Term
Hard Disk
Definition
Or hard disk drive, is a storage device that contains one or more inflexible, circular platters that magnetically store data, instructions, and information.
Term
Head Crash
Definition
When a read/write head touches a platter, usually resulting in loss of data or sometimes the entire drive.
Term
Backup
Definition
A duplicate of a file, program, or disk that you can use in case the original is lost, damaged, or destroyed.
Term
Floppy Disk
Definition
Or diskette, is an inexpensive portable storage medium. The most widely used floppy disk is 3.5 inches wide and typically can store up to 1.44 megabytes of data, or 1,474,560 characters.
Term
Floppy Disk Drive
Definition
A device that can read from and write on a floppy disk. Drives can either be built into the system unit or external units.
Term
Access Time
Definition
The time required to access and retrieve data.
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