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Questions and Answers
Which of the following is NOT an example of an output device?
Which of the following is NOT an example of an output device?
A monochrome monitor can display multiple colors.
A monochrome monitor can display multiple colors.
False
What are the two forms of output?
What are the two forms of output?
Soft Copy and Hard Copy
The basic colors used in color monitors are __________.
The basic colors used in color monitors are __________.
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Match the following output devices to their features:
Match the following output devices to their features:
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What does RGB stand for in the context of monitor colors?
What does RGB stand for in the context of monitor colors?
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A higher refresh rate results in a more flickering image.
A higher refresh rate results in a more flickering image.
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What is the term for the distance between two pixels on a screen?
What is the term for the distance between two pixels on a screen?
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The resolution of a monitor is commonly expressed in _____ by _____ format.
The resolution of a monitor is commonly expressed in _____ by _____ format.
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Match the following types of monitors with their characteristics:
Match the following types of monitors with their characteristics:
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Study Notes
Output Devices
- Output refers to processed data that is useful for the user or further processing. It can be categorized as soft copy (displayed on screen) or hard copy (printed documents).
- Output devices are hardware components that display processed results to users. They can output text, audio, video, and graphics.
- Examples of output devices include monitors, printers, plotters, projectors, speakers, and headphones.
Monitors
- Monitors, also known as display devices, show processed results on a screen. They are like small televisions and come in various sizes and specifications.
- Monitors are categorized as monochrome (single color) or color.
- Monochrome monitors display a single color, typically white, blue, black, or gray, similar to old mobile phones with a single color background and black text. They were widely used in devices requiring simple displays, such as ATMs, mobile phones, PDAs, and pagers.
- Color monitors display various colors based on the RGB (Red, Green, Blue) color model. They can generate numerous other colors by combining these primary colors.
Monitor Features and Specifications
- Color: Monochrome monitors are single-color, while color monitors use RGB to generate various colors.
- Size: Monitor sizes range from 15 inches to 22 inches.
- Resolution: The resolution of a monitor refers to the number of pixels (dots) it can display horizontally and vertically (e.g., 800 x 600). Higher resolution means better image quality. Modern monitors often have resolutions of 1024 x 768 or higher.
- Pixel Pitch: The distance between two pixels on a screen is called pixel pitch or dot pitch. A smaller pixel pitch results in clearer images.
- Refresh Rate: It is the number of frames per second a monitor can display, measured in Hertz (Hz), which represents one refresh per second. A higher refresh rate (e.g., 120Hz) means smoother images. It refers to the frequency at which the electron gun behind the screen regenerates a new image. A higher refresh rate reduces flicker.
Monitor Types
- CRT (Cathode Ray Tube) Monitors: CRT monitors use a technology similar to televisions, where an electron beam is fired from a gun at the back of the tube, striking a phosphorescent material on the screen, which glows when hit by electrons.
- LCD (Liquid Crystal Display) Monitors: LCD monitors offer advantages over CRT monitors, including smaller size, lighter weight, higher picture quality, and lower power consumption. They use fluorescent lighting and often include features like USB hubs, HDMI inputs, and TV tuners.
- Touch Screen Monitors: These monitors enable users to interact with the device by touching the screen.
Printers
- Printers are used to produce hard copies of documents.
Main Types of Printers
- Impact Printers: Impact printers generate output by striking a ribbon with a hammer, leaving a mark on the paper. They can print multiple copies using carbon paper but are noisy and slow.
- Non-Impact Printers: Non-Impact printers produce output without striking the paper, resulting in quiet and fast printing.
- Ink-Jet Printers: These printers use tiny jets of ink to create images on paper. Both black and white and color inkjets are available. They are relatively affordable but produce low quality output and are slower than laser printers.
- Laser Printers: These printers use a laser beam to draw an image onto a photoreceptor drum, then transfer toner powder onto the paper. They produce high-quality output, are fast, and relatively quiet.
- Thermal Printers: These printers use heat-sensitive paper and wax-based cartridges to generate images by heating the paper. They were once used for PCs but are now commonly found in cashboxes and some fax machines.
- Plotters: Plotters are specialized output devices used to produce large drawings and graphs, such as maps, engineering drawings, architectural plans, and business charts. They are standalone or peripheral devices and generally more expensive than printers.
Speakers and Headphones
- Speakers and headphones are used to output audio signals, converting electronic signals from sources like CDs, tapes, and DVDs into audible sound. High-quality speakers are crucial for achieving optimal sound reproduction.
Multimedia Projectors
- Multimedia projectors convert image data from computers or video sources into a bright image projected onto a distant wall or screen. They are used for presentations, demonstrations, and multimedia entertainment.
- Projector features include resolution, brightness, and functions like displaying data, program products, and video content.
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