Input And Output Flashcards
What is input in computing?
Input can either provide programs with instructions on what to do next or be the data that must be processed.
What makes up digital images?
Pixels make up digital images.
How does the number of pixels affect image quality?
More pixels means higher image quality.
What is a scanner?
An input device that scans images into a digital format for use on a computer.
What types of items can be scanned with a scanner?
- Bar codes
- Photographs
- Documents
- 3D objects
What does DPI stand for?
Dots per inch.
What is the relationship between DPI and image quality?
Greater DPI = more pixels = higher quality image.
What is colour depth?
The number of different colours that can be represented by a pixel.
What is the best quality colour depth available?
24 bit colour (about 16.7 million colours).
List some advantages of scanners.
- Large documents can be scanned into a single digital file.
- Scanned documents are stored digitally.
- Scanned copies can be emailed directly.
- Old documents can be stored for future generations.
- Old family photos can be shared digitally.
What are some disadvantages of scanners?
- Scanning can be slow.
- Quality depends on the original hardcopy.
What are digital cameras?
Devices such as smartphone cameras, digital compact cameras, and high-end DSLR cameras.
What is the difference between point-and-shoot and DSLR cameras?
- Point-and-shoot: compact, does not allow lens changes.
- DSLR: designed for professional use, allows lens changes.
How does optical zoom differ from digital zoom?
Optical zoom uses the camera lens; digital zoom enlarges the image but reduces quality.
What does ISO rating indicate?
How sensitive the camera is to light.
What is a biometric input?
Measures unique biological features of a person.
What is a key advantage of biometric input?
Security.
What are some ways ATMs receive input?
- Card reader slot
- Numeric keypad & menu buttons
- Modem/Network connection
- Touchscreen
- Money counter sensor
List some advantages of using ATMs.
- Allows banking transactions anytime.
- Not limited to own bank or country.
What are barcodes and RFID used for?
To automatically recognize a product or item.
What is the purpose of output in computing?
- Provide user feedback
- Provide permanent copies
- Allow data transmission
What types of output exist?
- Visual
- Sound
- Touch
- Other electrical signals
What are some advantages of display devices?
- Immediate feedback
- Interaction with the computer
- Easily changed content
What is resolution in display devices?
The number of horizontal and vertical pixels a screen can display.
What does contrast ratio measure?
The difference between the darkest black and the whitest white the display can produce.
What is an interactive whiteboard?
An input & output device that displays the contents of a connected computer’s screen.
What are some advantages of interactive whiteboards?
- Better interaction and participation
- Annotations can be saved
- Multimedia presentation
What are laser printers known for?
- More reliable
- Easier to maintain
- Better for black and white printing
What is the print speed measured in?
Pages per minute (ppm).
What is generally cheaper to run for higher volumes of printing?
Laser printers
Laser printers are often more economical for high-volume printing compared to inkjet printers.
Which type of printer is better for high-quality photo prints?
Inkjet printers
Inkjet printers are designed to deliver superior quality for photo printing.
What can happen to ink cartridges over time?
They can dry out
Ink cartridges may become unusable if left for extended periods without use.
How is print speed measured?
Pages per minute (ppm)
Print speed is typically indicated for text pages, while images may reduce speed.
True or False: Laser printers are generally slower than inkjet printers.
False
Laser printers are usually faster than inkjet printers.
What does DPI stand for in printing resolution?
Dots per inch
DPI is a measure of printing resolution, indicating the density of dots in a printed image.
What does a higher DPI indicate?
Better quality printout
Higher DPI values lead to more detailed and clearer printouts.
What is the monthly duty cycle of a personal printer typically under?
5000 pages
This indicates the robustness and expected usage of personal printers.
What colours do cheap printers typically use to create black?
Cyan, Magenta, Yellow
These three colours are combined rather than using a true black ink.
What is duplex printing?
Printing on both sides of the paper automatically
Duplex printing enhances paper usage efficiency.
What are common connection methods for printers?
USB port, wireless connection, media card slots
These methods facilitate different ways to send print jobs to the printer.
What technology does WiFi utilize for network connections?
Radio waves
WiFi provides a wireless alternative to physical cables for networking.
What is the purpose of a driver in computing?
To control the device
The driver translates instructions from the operating system into signals for the hardware.
What devices assist visually impaired users?
- Braille keyboard
- Braille display
- Speech recognition software
- Magnification devices
- Large-key keyboards
- Braille printers
These devices enhance accessibility for users with visual impairments.
What aids are available for hearing impaired users?
- On screen notices
- Flashing screens
- Vibration devices
These devices provide visual or tactile feedback instead of sound.
What should users lacking motor control consider using?
- Eye tracking devices
- Head movement devices
- Large key keyboards
- Large trackballs
- Joysticks
- Foot pedal control devices
- Sip and puff devices
These assistive devices cater to various levels of motor control issues.
What advice is given to prevent health issues related to computer use?
- Do not sit for hours on end
- Learn keyboard shortcuts
- Perform exercises for affected joints
- Avoid loud headphones
- Adjust monitor settings
These practices help alleviate physical strain and discomfort.
