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CUT6 2.6

Computers: Understanding Tech 6e 2.6

output device Hardware used to output data to a user.
screen The viewable portion of a display device.
monitor A display device that is separate from the computer and has its own power supply and plastic housing.
cathode ray tube (CRT) monitor A nearly obsolete type of monitor that uses a vacuum tube to direct electrons to illuminate colored phosphors on the back of the screen to light up a display image.
triad The arrangement of phosphors on a CRT monitor into a cluster of three (one red, one green, and one blue).
liquid crystal display (LCD) A screen that has two polarized filters, and between them liquid crystals that twist to allow light to pass through.
maximum resolution The highest display mode that a monitor can support. Sometimes called native resolution.
aspect ratio The ratio of width to height on a display screen.
refresh rate The number of times per second that each pixel on a monitor is re-energized; measured in hertz (Hz).
display adapter The computer component that translates and processes operating system instructions to create the screen’s display image.
graphics processing unit (GPU) The processor built into the display adapter.
monochrome display A type of display that shows output in only one color.
color depth The number of bits of data required to describe the color of about each pixel in a particular display mode.
video projector A device that captures the text and images displayed on a computer screen and projects them on to a large screen so an audience can see them clearly. Also called screen projector.
lumen (lm) The measurement of a projector’s brightness.
lamp A replaceable lamp (like a lightbulb) inside a projector that generates the brightness.
amplification In a speaker system, the ability of the system to produce a certain volume of sound.
frequency range The span of changes reflected in the transmission of voice or sound signals.
wattage The total amount of power drawn by a device; for a speaker, the amount of power the speaker can handle.
root mean squared (RMS) A standard measurement of the wattage that a speaker can handle in a reliable and sustained manner.
RMS maximum Short for root mean squared maximum. The maximum wattage a speaker can handle in short bursts.
peak momentary performance output (PMPO) The absolute maximum wattage a speaker can handle for a split second before it dies from wattage overload; not a realistic measurement of a speaker’s capabilities.
shielding A protective barrier that prevents electromagnetic interference in speakers designed for use with computers.
docking station A home base for a portable device, providing it extra capabilities, such as better speakers, more ports, and power recharging.
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