Computers: Understanding Tech 5e 2.6
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| output device | Hardware used to output data to a user.
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| screen | The viewable portion of a display device.
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| monitor | A display device that is separate from the computer and has its own power supply and plastic housing.
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| 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.
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| triad | The arrangement of phosphors on a CRT monitor into a cluster of three (one red, one green, and one blue).
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| liquid crystal display (LCD) | A screen that has two polarized filters, and between them liquid crystals that twist to allow light to pass through.
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| maximum resolution | The highest display mode that a monitor can support. Sometimes called native resolution.
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| aspect ratio | The ratio of width to height on a display screen.
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| refresh rate | The number of times per second that each pixel on a monitor is re-energized; measured in hertz (Hz).
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| display adapter | The computer component that translates and processes operating system instructions to create the screen’s display image.
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| graphics processing unit (GPU) | The processor built into the display adapter.
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| monochrome display | A type of display that shows output in only one color.
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| color depth | The number of bits of data required to describe the color of about each pixel in a particular display mode.
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| 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.
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| lumen (lm) | The measurement of a projector’s brightness.
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| lamp | A replaceable lamp (like a lightbulb) inside a projector that generates the brightness.
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| amplification | In a speaker system, the ability of the system to produce a certain volume of sound.
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| frequency range | The span of changes reflected in the transmission of voice or sound signals.
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| wattage | The total amount of power drawn by a device; for a speaker, the amount of power the speaker can handle.
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| root mean squared (RMS) | A standard measurement of the wattage that a speaker can handle in a reliable and sustained manner.
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| RMS maximum | Short for root mean squared maximum. The maximum wattage a speaker can handle in short bursts.
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| 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.
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| shielding | A protective barrier that prevents electromagnetic interference in speakers designed for use with computers.
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| 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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