Living with computers

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GPS Global Positioning System
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navigation system
interactive whiteboard
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large touchscreen monitor used at school
assistive technology
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technology that helps people with disabilities for ex. screen reader
screen reader
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a program that reads aloud onscreen text, menus and icons
HMD head-mounted display
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headset used with virtual reality (helmet, googles)
virtual reality
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artifical enviroment of the latest video games
wireless network
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let you access the Internet without cables
technological dependence
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when computeras are down our way of life braks down, planes stop flying telephones don't work
electronic waste
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technology develops very quickly that we have to scrap computers when tehy become obsolete
computer addiction
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an inappropriate and excessive use of computers
cybercrime
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crime committed through internet
loss of privacy
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unauthorised use of personal data or reciving unwanted electronic messages
hardware
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any electronic or mechanical part of the computer that you can see or touch
software
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set of instructions called program, which tells a computer what to do
CPU (Central Processing Unit)
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the heart of the computer, a microprocessor chip which processes data and coordinates the activities of all the other units
main memory
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holds the instructions and data which are being processed by the CPU
RAM (Random Access Memory)
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computer memory available to the user for creating loanding or running programs
ROM (read only memory)
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computre memory in which program instructions, operating procedures are permanently sotred and cannot be changed by the user
peripherals
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physical units attached to the computer
input devices
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let us enter data and commands (e.g. the mouse, the keyboard)
output devices
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lt us extract the results (e.g. monitor, printer) ist the visible or audiable result of data processing
strorage devices
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are used to store information pernamently (e.g. hard disks)
ports
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allows communication between the computer and the devices
mainframe
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a large computer used for intensive data processing and often linked to many terminals
desktop
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a typical computer found in many businesses and popular for home use
laptop
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a portable computerthat can be closed up like a briefcase
TFT screen
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thin film transistor that produces very sharp images
touchpad
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sensitive pad that you can touch to move pointer
battery packs
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lats you use computer when there are no electrical outlets available
tablet PC
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a full-function PC, though it only weights 1.2kg
PDA
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a hand-held computer which can be used as telephone, a web explorer and personal organizer
hand-held devices
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small enough to be used or operated while being held in the hand
stylus
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a sepcial pen used with touch screen
touch screen
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touch-sensitive display screen on a computer or other electronic device
handwriting recognition
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recognizes characters written by hand
voice recognition
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recognizes spoken words
wireless
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having no wire, without cables
wearable computers
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a small computer thet fits into items of clothing
alphanumeric keys
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letters and numbers
numeric keypad
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appears to the right cointains numeric and editing keys
num lock
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is used to switch from numbers to editing functions
function keys
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top of keyboard can be programmed to special jobs
cursor keys
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arrow keys which move the insertion point, Home, End, Page Up
dedicated keys
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to issue commands or produce alternative characters
Ctrl
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changes the function of other keys
Caps Lock
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stes te keyboard in CAPITALS mode
Enter (Return)
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to select options from a menu to start a new paragraph
Backspace
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deletes the character to the left of your current position
voice-recognition system
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converts voice into text, you can dictate text directly onto your word processor or email program
scanner
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reads images and converts them into electronic codes which can be understood by computer
barcode scanners
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reads barcodes on the products sold in shops and sen the price to the computer
barcodes
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consist of a series of black and white stripes used to give products a unique indentification number
resolution
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measurment
optical character recogniotion
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allows to scan pages of text and save them into your word processor/ scans and identifies characters
flash memory
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tiny storage device/ retains information even if the power turned off
USB
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Universal Serial Bus
frames
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pictures
processor CPU Central Processing unit
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brain of computer
chips
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small piece of silicon with complex electrical circuit(integrated circuit) that executes instructions and coordinates activities of all the other units
control unit
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examinces instructions from memory and executes them
arithmetic ald logic unit (ALU)
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performs arithmetic and logical operations
register
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high-speed units of memory used to store and control data
motherboard
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main circuit board, contains the CPU, memory chips, expansion slots and controllers for peripherals
buses/paths
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connections which carries electronic signals in motherboard
expansion slots, cards
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give us extra functions
pintout
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the output on paper
printer driver
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is program installed to convert data into form that printer can understand
pint spooler
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stores files to be printed when the printer is ready, change order
resolution
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output quality (dpi)
ppm
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pages per minute
print server
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connects a printer to a network, enables users to share printing resources
dot-matrix printer
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uses a group or matrix of pins to create the precise dot
impact printing
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a head containing pins strikes an inkes ribbon to make letters
ink-jet
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generates an image by spraying tiny precise drops of ink onto the paper
cartrige
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a container thet holds the ink in an ink-jet printer
multi-function printers
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can work as scanners, printers, fax, photocopiers
laser printer
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uses a laser beam to fix the ink to the paper
page description language PDL
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a language that tells a printer how to print a document
imagesetter
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generates very high-resolution output
plotter
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draws detailed designs on paper

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