Computer Peripherals: Types and Features
Advantages of LCD Monitors
What are the advantages of an LCD monitor?
LCD monitors are flat, which reduces glare and reflections. They are not bulky or heavy, and they do not use cathode rays. Therefore, they do not generate electromagnetic interference. They use digital technology, with little emission of radiation and a very low flash. They also consume less energy and make better use of visible space.
Keyboard Functions and Types
Checking for Key Presses
How do I check if a key is pressed on the keyboard?
The keyboard has a processor that checks if any key is pressed and sends the code to the keyboard interface on the motherboard.
Cursor Movement Keys
What are the cursor movement keys?
These keys are located to the right of the alphanumeric keys and are divided into two groups: cursor control keys and navigation/command keys. These include: Insert, Home, Page Up, Delete, End, and Page Down.
Wireless Keyboards
What is a wireless keyboard?
Wireless keyboards are characterized by the absence of cables. Communication is via infrared.
Keyboard Types
Keyboard types:
- Enhanced 101-key
- Keyboard 104 key Windows
- Ergonomic keyboards
- Multimedia
- Wireless
- Laptop
- Keyboard PC/XT
Mouse Types and Operation
Types of Mice
What types of mice are there?
- Opto-mechanical mouse
- Optical mouse
- Ergonomic mouse
- Wireless mouse
Mouse History and Operation
The mouse was introduced with the Apple Macintosh. It was not until the beginning of the 1980s when it was introduced in Windows and the graphical user interface.
It is a device that allows you to point and select objects on the screen by pointing the cursor.
Scanners and Image Processing
Scanner Functionality
What is a scanner?
A scanner is a peripheral that allows us to capture and convert printed information into digital information, whether text, image, or photo, for further processing on the computer.
Image Scanning Process
What is the operation of an image scanner?
It reads a set of lights that move across the image. The distance between the light detectors determines the horizontal resolution of the scanner.
Rasterization
What is raster?
Raster is the conversion of text and graphics that make up the document to a small set of points that apply to paper printer.
Monitors, Printers, and Plotters
Monitors
What is a monitor?
It is the ultimate output device that displays both the information that we introduce and the system’s output.
Monitor Parameters
Characteristic parameters of a monitor:
- Size: The dimensions of the diagonal, measured in inches.
- Resolution: A pixel is the smallest unit of graphic information that can be displayed on the screen.
- Spot size: The distance between two adjacent points.
- Interlaced: Interlaced monitor screen repainting of two past.
- Vertical scan rate: Number of times the image is drawn on the screen per second.
Printers
What is a printer?
Printers are peripherals that transfer text or images generated by the computer to a printing medium.
Dot Matrix Printers
What is a dot matrix printer?
It uses an ink ribbon to print the characters, which is located near the surface of the paper. A roller called a platen serves as support for the paper.
Plotters
What is a plotter?
An output device that is used for editing technical drawings, drawings, and maps.
Speakers, Webcams, and Other Peripherals
Speakers
What are the speakers?
Speakers are used to play sounds. They are classified as active or passive, with the difference that the former have an amplifier while the latter do not.
Webcams
What is a webcam?
A webcam is a peripheral that connects to your computer via USB. Most allow for videoconferencing.
Monitor Maintenance
What minimal maintenance does a monitor need?
Ensure sufficient space and airflow, preventing objects from stacking on or removing the foot from the monitor, for good ventilation. Do not put tape or other magnetic devices on top. Clean with a lint-free cloth. Do not apply any liquid on the screen, but on the cloth. Do not touch the screen with your hands and never open the case of CRT monitors.
Keyboard Elements
Indicate keyboard elements:
(This section requires additional context to be properly filled. Assuming it refers to physical parts, a general list is provided)
- Alphanumeric Keys
- Function Keys
- Control Keys
- Navigation Keys
- Numeric Keypad
- Indicator Lights
NetMeeting
What is NetMeeting?
NetMeeting is software that came with webcams, allowing users to talk with friends via the Internet.
Digital Camera Components
List all the components of a digital camera:
- Viewfinder
- Lens
- Flash
- Timer
- LCD display
- Zoom
- Switch
- Menu button
- Battery
- Memory card connectors
Ergonomics
Definition of Ergonomics
Define ergonomics:
Ergonomics is the study of work in relation to the environment in which it is carried out and those who perform it. It is used to determine how to design or adapt the workplace to the worker.