Intro To Pc

Front 1

exabyte

Back 1

(1) 2 to the 60th power (1,152,921,504,606,846,976) bytes. An exabyte is equal to 1,024 petabytes

Front 2

kilobyte

Back 2

In decimal systems, kilo stands for 1,000, but in binary systems, a kilo is 1,024 (2 to the 10th power). Technically, therefore, a kilobyte is 1,024 bytes, but it is often used loosely as a synonym for 1,000 bytes.

Front 3

petabyte

Back 3

It wasn't that long ago that data storage devices were measured in gigabytes and terabyte hard drives seemed exotic.

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gigabyte

Back 4

2 to the 30th power (1,073,741,824) bytes. One gigabyte is equal to 1,024 megabytes.

Front 5

megabyte

Back 5

(1) When used to describe data storage, 1,048,576 (2 to the 20th power) bytes. Megabyte is frequently abbreviated as M or MB

Front 6

terabyte

Back 6

2 to the 40th power (1,099,511,627,776) bytes. This is approximately 1 trillion bytes.

Front 7

basic input/out put system

Back 7

(bī´ōs) Acronym for basic input/output system, the built-in software that determines what a computer can do without accessing programs from a disk. On PCs, the BIOS contains all the code required to control the keyboard, display screen, disk drives, serial communications, and a number of miscellaneous functions.

Front 8

battery

Back 8

A rechargeable battery used in portable computer devices, such as notebook computers. The most common substances used in computer battery packs are nickel cadmium (Ni cad), nickel metal hydride (NiMH), and Lithium Ion.

Front 9

Central processing unit

Back 9

The amount of time the CPU is actually executing instructions. During the execution of most programs, the CPU sits idle much of the time while the computer fetches data from the keyboard or disk, or sends data to an output device.

Front 10

expansion card

Back 10

A collection of wires and protocols that allows the expansion of a computer by inserting printed circuit boards (expansion boards). Traditionally, PCs have utilized an expansion bus called the ISA bus.

Front 11

expansion card slot

Back 11

An opening in a computer where a circuit board can be inserted to add new capabilities to the computer. Nearly all personal computers except portables contain expansion slots for adding more memory, graphics capabilities, and support for special devices.

Front 12

hard drive

Back 12

The mechanism that reads and writes data on a hard disk. Hard disk drives (HDDs) for PCs generally have seek times of about 12 milliseconds or less.

Front 13

heat sink with cooling fan

Back 13

A component designed to lower the temperature of an electronic device by dissipating heat into the surrounding air. All modern CPUs require a heat sink.

Front 14

motherboard

Back 14

The main circuit board of a microcomputer. The motherboard contains the connectors for attaching additional boards.

Front 15

power supply

Back 15

Also called a power supply unit or PSU, the component that supplies power to a computer. Most personal computers can be plugged into standard electrical outlets.

Front 16

RAM

Back 16

that allows faster access to data in the same row or page. Page-mode memory works by eliminating the need for a row address if data is located in the row previously accessed.

Front 17

audio out

Back 17

Refers to the reproduction and transmission of sound stored in a digital format. This includes CDs as well as any sound files stored on a computer.

Front 18

Keyboard

Back 18

The set of typewriter-like keys that enables you to enter data into a computer. Computer keyboards are similar to electric-typewriter keyboards but contain additional keys.

Front 19

Monitor HD-15

Back 19

Another term for display screen. The term monitor, however, usually refers to the entire box, whereas display screen can mean just the screen.

Front 20

mouse

Back 20

A device that controls the movement of the cursor or pointer on a display screen. A mouse is a small object you can roll along a hard, flat surface.

Front 21

parallel

Back 21

Refers to processes that occur simultaneously. Printers and other devices are said to be either parallel or serial.

Front 22

RJ-11

Back 22

Short for Registered Jack-11, a four- or six-wire connector used primarily to connect telephone equipment in the United States. RJ-11 connectors are also used to connect some types of local-area networks (LANs), although RJ-45 connectors are more common.

Front 23

RJ-45

Back 23

Short for Registered Jack-45, an eight-wire connector used commonly to connect computers onto a local-area networks (LAN), especially Ethernets. RJ-45 connectors look similar to the ubiquitous RJ-11 connectors used for connecting telephone equipment, but they are somewhat wider.

Front 24

serial

Back 24

One by one. Serial data transfer refers to transmitting data one bit at a time.

Front 25

USB

Back 25

Short for Universal Serial Bus, an external bus standard that supports data transfer rates of 12 Mbps. A single USB port can be used to connect up to 127 peripheral devices, such as mice, modems, and keyboards