21-30 Flashcards
Input Devices
-Used to enter data into a computer system
-Keyboard
-Most commonly used input device
-2 major issues:
=Slow
=Error-prone
-QWERTY layout most common (designed to be slow)
-Dvorak layout more efficient but not widely used
-Ergonomic keyboards
Input Devices (Continued) 2
-Pointing Devices - moves a cursor on the computer screen (on a GUI)
=Mouse (most common pointing device)
=Touchpad (portables)
=Touchscreens (stylus)
Input Devices (Continued) 4
-Optical Scanners
=Flatbed scanners - scans a page (or pages) and saves as an image
=Barcode scanners (UPC - Universal Product Code)
=QR code scanners
-RFID (radio-frequency identification) Scanners
-Magnetic Strip Reader (credit cards, id cards, etc.)
-NFC (Near Field Communication) Technology
=Allows two devices to share data with each other by touching them or bringing them close together
=Point of sale systems
-Biometric Scanners (fingerprints, retinas)
Input Devices (Continued) 3
-Web cams
-Microphones
-Game controllers
Output Devices
-Monitors (aka displays)
-Work by lighting up pixels (picture elements) on the screen
-Three colors (Red/Green/Blue) used to create all colors
-Resolution
=The number of horizontal pixels by vertical pixels, such as 1280×1024
=The higher the resolution, the sharper the image (but also smaller)
-CRT (Cathode Ray Tube) Monitors
=Big, bulky, heavy
=Legacy technology
-LCD (Liquid Crystal Display) Monitors
=Thinner, lighter
=Originally developed for portable computers
Output Devices (Continued) 4
-Projectors
=Produce larger output than a monitor
=Used in presentations (such as in-class lectures)
-Video Cards
=Provides the data signal and connection for a monitor or projector
=Can have its own memory (VRAM)
=Can have a GPU
=VGA, DVI, HDMI
-Speakers and Headphones
-Sound Cards
Output Devices (Continued)
-Ink Jet Printers
=Most popular type of personal printer
=Sprays droplets of liquid ink onto paper
=For color printing, standard colors are cyan, magenta, yellow, and key (black), abbreviated as CMYK
=Cannot print very fast
=Printers very inexpensive, but ink cartridges have to be replaced often, so cost per page can be expensive
Output Devices (Continued) 3
-Dye-Sublimation Printers
=High-end printers, mainly used for printing photographs
-Photo Printers
=Can be high-end ink jet or dye-sublimation printers
-Thermal Printers
=Applies heat to specially coated heat-sensitive paper to produce output
=Mainly used to print receipts
=Output can fade over time
-Three-Dimensional Printers
=Can create objects such as prototypes and models
=Dental and medical imaging, architecture, etc.
Output Devices (Continued) 2
-Laser Printers
=Most common type of business printer
=Uses a powdered ink cartridge (toner) that lasts about twice as long as liquid ink cartridges
=Laser printers more expensive than ink jet printers, but over time cost per page is less
=Print faster than ink jet printers
Output Devices (Continued) 5
-Plotters
=Used to print very large output (blueprints, posters, maps)
-Multifunction Devices
=A printer with a built-in scanner and sometimes fax capabilities
=Can be used as a copier
