Input, Output And Other Devices Flashcards
What does a GPU do?
The Graphics Processing Unit (GPU) calculates and displays images on a screen.
What are storage devices used for?
They store data, such as the operating system, BIOS(basic input/output system), and user-created files like images and documents
What is the difference between internal and external storage?
Internal storage, like hard drives and RAM, is inside the computer. External storage, like USB drives, is outside and removable.
Why do we use HDMI
We prefer HDMI because it gives better picture and sound quality, works with one cable for both video and audio, supports higher resolutions like 4K, and is used in most modern devices
Scanner
• Convert physical data into electronic data
Scanners advantages and disadvantages
Advantages:
• Produce accurate and high-resolution images
•Scanned images can be added to electronic documents or edited easily
Disadvantages:
•Scanned images can lose clarity and quality
•Image files can be very large and take up space
Digital cameras
Used to capture digital images and input them directly into a computing device
Advantages and Disadvantages of Digital Cameras
Advantages
• You can view your images immediately and discard any that you don’t want
• They are more environmentally friendly because you do not need to use toxic chemicals to develop the film
Disadvantages
• Quality of the image will be limited to the maximum resolution
• have certain limitations for nighttime photography
Biometric input devices
Use the unique measurements and characteristics of your body to interact with a computing device
Advantages and disadvantages of biometric devices
Advantages
• Faster to use than passwords
• Biometric input is harder to hack
Disadvantages
• Some people’s fingerprints cannot be read
• It it is influenced by disease and substances
Advantages of ATM and POS terminals
• ATMs make basic, banking faster and easier. These features are available 24/7
• POS terminals can keep accurate track of stock and can provide reports on sales and stock movement
Advantages and Disadvantages of wireless input devices
Advantages
• Wireless devices are not limited by cables and can be used anywhere
Disadvantages
• Wireless input devices may not work well if they are too far from the connected device
Disadvantages and advantages of alternative input devices(eg laser keyboard)
Advantages
• Are extremely reliable
Disadvantages
• It does not offer tactile feedback
What determines the quality of the image of a scanner
Colour depth
Resolution
Dynamic range
Colour depth/bit depth
Is the number of bits used to indicate the colours on a single pixel. The higher the bit number. The better the color depth
Resolution of scanner
The amount of detail an image can hold and iti is measured in pixels per inch (ppi) or dots per inch (DPI). The higher the ppi or dpi the more information there is in the square
Dynamic range
This measures the range of light the scanner can read and use to produce a range of tones and colours
What is camer quality measured by
Resolution
Lens aperture
Focal length
Resolution in camera
The amount of detail that a camera can capture. It is measured in megapixels
Lens aperture
The maximum amount that the lens can open. The wider it opens the more light it can take in, which means that you need less light to take a good picture
Focal length
How much a camera can zoom. The focal length is shown by a number and the times symbol. A zoom of 3× means that the longest focal length is 3× the distance of the shortest focal length
Function of a display device
is to display the input you have given the computer to allow you to make choices and interact with programs of the operating system
Advantages of display devices
• The user gets immediate feedback about what is being processed
• Displays can be customized to suit the user. For example lowering the brightness to make things easier to read
Disadvantages of display devices
• The content displayed is not private. Anyone behind you can see what are you doing
• Displayed output is not permanent and you would need to print or save the data to have a permanent record of what you see
What determines a display devices quality
Resolution
Aspect Ratio
Contrast ratio/color depth
Response time or frequency
Resolution in display devices
The number of pixels that can be displayed horizontally and vertically
Aspect Ratio
The basic shape of the screen based on the ratio of the width to the height measured in inches
Contrast ratio or color depth
A measure of the number of shades that the display device cancan show between it’s blackest black and brightest white
Response time or frequency
Measures how quickly the pixels on a screen refresh.
factors that affect printer quality?
Resolution
Speed
Duty cycle
Resolution of a printer
Dots per inch (dpi)
DPI measures how well the printer can match the pixels per inch (ppi). If the printer can match the ppi exactly, the image will come out crisp and clear
Speed of a printer
Measured in pages per minute (ppm) the higher the ppm thethe faster thethe prints.
Laser printers always havehave higher ppm than inkjet because of the different ways they print
Duty Cycle
The monthly duty cycle indicates the maximum number of pages a printer can print in a month without it failing
Home printer duty cycle vs business
Home printer - 5000 pages
Business printer - 200 000 pages
Advantages of interactive whiteboards
• Allow teachers to combine visual and auditory learning styles into one. This allows learner’s to absorb information in multiple formats.
• They allow learner’s to become part of the learning process by making them active participants in their lessons
Interactive whiteboards disadvantages
• It usually needs a dimly lit venue for the projected images to be seen
• most whiteboards are expensive and require special equipment
What is OCR, and what is it used for
OCR stands for Optical Character Recognition. It is a software program designed to convert printed characters, such as those in hard copy documents, into digital text. This allows the user to edit and search the text in a word processing program.
What does “plug and play” mean in computing?
Plug-and-play refers to devices that can be connected to a computer and are automatically recognized and configured without requiring manual installation of drivers.
What are device drivers, and why are they important?
Device drivers are software programs that allow hardware devices to communicate with the operating system. They ensure that the hardware functions correctly with the computer.
What are the advantages of using plug-and-play devices?
Plug-and-play devices eliminate the need for manually installing drivers, making setup faster and more convenient.
How can printers and projectors connect to computers?
Printers and projectors can connect to computers using HDMI cables, VGA cables, USB cables, or Bluetooth.
Why digital cameras in smartphones become outdated very quickly
Digital cameras in smartphones can become out of date very quickly when new smartphones come on the market. This is because the technology in the new devices is usually better than the
technology in older devices
Why a criminal might clone your fingerprints
A criminal might clone your fingerprints to unlock devices or to gain access to areas that your biometric data gives you access to.
Disadvantage of POS systems and ATMs
• ATMs can be targets of card-skimming scams and using ATMs to draw cash can make you a target for criminals
• POS systems also need to have their software updated and staff must be trained to use them
Advantages of wireless printers
Wireless printers can also connect to smartphones and tablets, so users can connect to them directly
.
Wireless printers can be connected to multiple devices on the same wireless network
Where can you get device drivers
Device drivers will usually be included on a disk that comes with the hardware or you can download them from the manufacturer’s website.
Explain how device drivers workHow can ORC be used to improve accessibility for physically challenged users?
The driver helps the computer understand the information you give it through an input device or translate the information the computer sends to an output device so that it can display the information
correctly
