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84 Cards in this Set
- Front
- Back
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Computer |
Electronic machine that manipulated data according to a set of instructions called a program . It accepts input , processes it and provides output |
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Input |
Data and instructions from a user or environment |
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Output |
Feedback or results of processing |
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Computer system |
All hardware equipment together will all the software that makes it work |
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Basic operations of computer system |
Input , processing , output and storage |
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User |
A person who uses computers for work or entertainment |
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Input devices |
Any hardware component that allows users to enter data or instructions into a computer |
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The keyboard (text data input ) |
Contains keys that users press to enter data in a computer , all computer keyboards have a typing area inclusive of letters of alphabet , numbers and other basic keys |
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Keys |
Buttons that make up keyboards |
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Section of keys |
Alphabet keys Function Numeric Arrow Command (insert , delete , home) |
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Repetitive strain injury |
Health issues that Results in using a keyboard for too long |
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Advantages of keyboard |
Most common means if entering additional keyboard Inexpensive Keyboard supplies with most computers Skill typist can enter data very quickly |
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Disadvantages of keyboard |
Data entry can be time consuming Speed of input depends on the users experience Errors in transcription Not suitable for creating diagrams |
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Concept Keyboard (Text Data input ) |
Manual input device and is a flat board that contains a grid of buttons and each button can be programmed to to do whatever An overlay sheet with symbols shows what the user is pressing |
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Advantages of concept keyboards |
Much faster for non text selections Keyboard is waterproof |
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Disadvantages of concept keyboard |
Poor for text or numeric input Limited to the options shown on the keyboard |
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Numeric pad or keypad (text data input ) |
A panel of key having number and numeric operation and used in conjunction with a television set or other electronic device |
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Pointing devices / cursor control devices |
Input device that allows the user to control the movement of the pointer ie location of cursor on the screen |
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Mouse (pointing device ) |
Small handheld decide pushed over a horizontal surface where the user controls movement of the pointer or location of the cursor on the screen |
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Pointer |
Symbol or graphical image in a computer mounted that echoes movements f the pointing device (mouse , touchpad etc) |
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Cursor |
Movable symbol indicating position inna display screen where the next character entered from the keyboard will appear |
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Joystick (pointing device ) |
Vertical sticks that moves the graphical cursor in the direction the stick is pushed |
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Light pen (pointing device ) |
Resembles a pen which is pointed on the position of the screen and the software finds the exact position being indication which can be selected , just as a mouse |
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Trackball (pointing device) |
Pointing device consisting of a ball housed in a socket confiando sensors to detect rotation of the ball about two a us (upside down mouse ) |
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Graphics tablet /digitising tablet (pointing device ) |
Similar to a touch pad , controlled by a pen or stylus used like a normal pen The tablet contains electronics enabling it to detect movement of pen and translate movements into digital signals that’s is sent to the computer |
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Stylus (pointing device) |
Pen shaped instrument used to input commands to a computer screen , mobile device or graphics tables |
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Touchpad (Pointing device) |
Flat surface that detects finger contact and can generate a mouse by tapping the pad. It’s a stationary pointing device |
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Touchscreen (pointing device) |
Device embedded into a screen of a monitor that users interact with by physically pressing it’s shown on screen |
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Voice data entry (VDE) (Sound data entry devices) |
Accepts spoken word as input data or commands |
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Microphone (Sound data entry devices) |
Used to record sounds and voices to give voice commands and for voice communication |
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Digital camera (Graphical data entry ) |
Records images digitally and allows for the quick transfer of picture data from the camera to computer Uses a light sensor to capture and image then converts it to electrical cahrages then stores in a memory caes |
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Document |
Hardware that connects to a computer system to add functionality |
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Webcam (Graphical data entry) |
Video camera attached to a computer that allows live chats |
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Document scanner (Graphical data entry) |
Copies a document or picture and stores it in a computer |
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Hand held scanner |
Reads in information being dragged over it |
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Flatbed scanner |
Printed material is laid flat upon the surface of the canned and the information is captured in a similar manner to that of a photocopier machine |
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Sheet fed scanner |
Feeds information in through rollers |
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OMR(Source data entry devices ) |
Optical mark reader/recognition detects position of a mark in a paper Eg.shading multiple choice |
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OCR (Source data entry device) |
Optical character reader is the ability to read printed information into a computer Eg scanned in texts |
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MICR(Source data entry devices) |
Magnetic ink character reader detects data printed using a special ink Eg cheques |
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QR |
Magnetic stripe reader scans information in the form of a magnetic strip on the surface of a card |
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BCR(Source data entry device) |
Barcode reader reads a pattern of bars representing the code number on the item on which is it printed |
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QR Scanner (Source data entry device) |
Reads Quick response code - trademark for a type of matrix code ( or two dimensional barcode) |
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Barcode |
Machine readable optical label containing information about the item to which it’s attached |
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Sensor (Specialised Input device & assistive technology ) |
Input device that collects specific data from the environment directly and transmits it to a computer |
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Biometric input device (Specialised Input device & assistive technology ) |
Biometrics measures an individual body characteristics then using it to identify them Eg fingerprint |
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Remote control (Specialised Input device & assistive technology ) |
Input device that use infrared light to transmit data signals |
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Data |
Raw facts or figures hat can be turned into something meaningful |
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Information |
The result of data being processed into something meaningful |
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Output devices |
Used to translate information processes by the computer into a form that the user can understand Hard copy or soft copy |
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Hardcopy |
Printed copy of computer output |
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Softcopy |
temporary and intangible output |
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Speakers |
Electric device that converts electrical signals to loud enough sounds eg. beeping sound to say you made an error |
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Advantages of speakers |
Everyone can hear in the room create an ambiiance to accompany a presentation help blind people to use a computer |
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Disadv of Speakers |
output can disturb others high quality speakers are expensive |
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Monitor |
Television like display for softcopy output |
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resolution |
how clear and detailed the output on the screen can be one dot = 1 pixel.. the more pixel per inch(ppi) the clearer the graphic |
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DPI |
Dots per inch |
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PPI |
Pixels per inch |
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rgb |
red green blue |
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Types of monitors |
crt, lcd, led |
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LCD |
Liquid crystal display |
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LED |
Ligh emitting diode |
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CRT |
cathode ray tube |
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Impact printer |
Uses pins/hammers that hit a ribbon to tranfer images to the paper |
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non impact printer |
Uses chemicals , lasers or heat to form images |
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dot matrix printer |
arranges printed dots to form characters and images very noisy |
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Line printer |
prints one line at a time |
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Page printer |
prints one page at a time |
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inkjet printer |
non-impact which print head contains injection chambers that squirts ink droplets on the paper` |
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Laser printer |
printer that uses laser technology. quiet and prints a large # of sheets quickly |
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ADV Laser printer |
High quality layout fast rpintouts cost per page low quiet |
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DISADV Laser printer |
most expensive type toner more expensive than ink jet expesnive to repair bulky cannot use continous to create carbon copies liek with a dot matrix |
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adv inkjet |
cheap to buy More compact than a laser Catridges less to replace speed fastser than dot matrix |
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disadv inkjet |
noisier than laser but not as dot matrix color printing slow cost of page print is more expensice than lasser ink smudges when wet still catridges can dry out |
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Plotter |
able to draw high quality pics on very large pieces of paper |
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Types of plotter |
flatbed, drum, pinch roller |
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Flatbed |
holf the paper while pe moves` |
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drum |
roll paper over a cylinder |
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pinch roller |
mixture of two types |
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Adv plotters |
drawing smae quality like expert larger sixes of paper can be used |
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disadv of plotters |
slower than printers more expensive than printer no high quality text products |
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thermal wax printers |
uses CMYK color brands they are expensive |
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Refreshable braille display or braille terminal |
electro mechanical device for displaying characters |
