Input And Output Flashcards
What makes up digital images?
Pixels
Pixels are the small dots you see when zooming in on an image.
What does a higher number of pixels indicate?
Higher image quality
What is the function of a scanner?
Scans images into a digital format for use on a computer
What types of items can be scanned by a scanner?
- Bar codes
- Photographs
- Documents
- 3D objects
What does DPI stand for in scanning?
Dots per inch
What is the relationship between DPI and image quality?
Greater DPI = more pixels = higher quality image
What is the best quality colour depth available?
24 bit colour (about 16.7 million colours)
Name one advantage of scanners.
Scanned documents are stored digitally & don’t take up physical space
What is a disadvantage of scanners?
Scanning can be slow
What is a point-and-shoot camera?
A compact camera designed for quick use and limited technical expertise
What is a DSLR camera designed for?
Professional use where the lens needs to be changed
What is the advantage of a larger sensor in a camera?
Better quality images, even with the same number of megapixels
What is the difference between optical and digital zoom?
Optical zoom uses the camera lens; digital zoom enlarges the image but reduces quality
What does ISO rating indicate?
How sensitive your camera is to light
What is the main advantage of biometric input?
Security
Name one disadvantage of biometric input.
Expensive to implement, maintain and use
How do ATMs receive input?
- Card reader slot
- Numeric keypad & menu buttons
- Modem/Network connection
- Touchscreen
- Money counter sensor
- Money deposit slot
What is one advantage of using ATMs?
Allows for banking transactions at any time of day or night
What is a disadvantage of using ATMs?
It can be dangerous to use an ATM
What technology do Point of Sale systems use to recognize products?
Barcodes & RFID tags
What is an advantage of using barcodes in POS systems?
Much faster than typing in prices on a keyboard
What is a touch screen?
A combination of an LCD and a thin ‘touch sensing’ film
What is one advantage of touch screens?
Intuitive to use – very little training needed
What is a disadvantage of touch screens?
Typing on an on-screen keyboard is not as fast or easy as a real keyboard
What are data collection devices used for?
Capturing data using sensors, switches, cameras, microphones, etc.
What is an advantage of data collection devices?
Data is captured automatically using sensors
What is one limitation of data collection devices?
Sensors can fail without the problem being detected
What types of input do smartphones and tablets have?
- Touch screen
- Physical buttons
- Camera/video camera
- Accelerometer/gyroscope
- Microphone
What is the purpose of output in computing devices?
- Provide user feedback
- Provide permanent copies of results
- Allow data transmission between devices
What are the types of output?
- Visual
- Sound
- Touch
- Other
What is the advantage of display devices?
Provide immediate feedback to the user
What is a disadvantage of display devices?
Output is not permanent
What does resolution refer to in display devices?
The number of horizontal and vertical pixels that a screen can display
What is the contrast ratio?
The difference between the darkest black and the whitest white the display can produce
What is aspect ratio?
Relationship between width and height of the screen
What does response time measure?
How quickly the monitor updates its pixels
What do lumens describe in projectors?
The brightness of the image projected
What connection types do monitors typically use?
- VGA
- DVI
- HDMI
- DisplayPort
What is an interactive whiteboard?
Input & output device that displays contents of a connected computer’s screen
What is one advantage of interactive whiteboards?
Better interaction and participation to enhance the process of teaching and learning
What is a disadvantage of interactive whiteboards?
Only one person can use it at a time
What are the two main types of printers?
- Laser Printers
- Inkjet Printers
What is the print speed measured in?
Pages per minute (ppm)
What does monthly duty cycle indicate?
The maximum number of pages that can be printed in a month without breaking down
How do colour printers create black ink?
Combine Cyan, Magenta, and Yellow inks
What is one common connection type for printers?
USB port
What does Plug and Play refer to?
Method of rules for how a device identifies itself to the computer when connected
What technology does WiFi use to connect to networks?
Radio waves
WiFi eliminates the need for physical cables.
List three examples of wireless technology applications.
- Wireless printing
- Wireless sound (Bluetooth headsets, speakers, subwoofers)
- Wireless video & images
What is the purpose of Plug and Play technology?
To set rules for how a device identifies itself to a computer upon connection
It simplifies the process of adding new hardware.
What happens if a computer does not have the software for a newly connected device?
It will ask you to install the required software
This usually occurs only the first time the device is connected.
What is a driver?
The software that controls a device
Drivers translate operating system instructions into signals for hardware.
What is the function of a driver in relation to an operating system?
It translates instructions from the OS into electrical signals for the device
For example, printing a document.
Name two devices designed for visually impaired users.
- Braille keyboard
- Screen narrator/text-to-speech software
What type of device can provide notifications for hearing impaired users?
On-screen notices or flashing screens instead of sound
These devices help convey information visually.
Which devices assist individuals lacking motor control?
- Eye tracking devices
- Head movement devices
- Large key keyboards
- Large trackballs
- Joysticks
- Foot pedal control devices
- Sip and puff devices
What is one recommendation for maintaining health while using input and output devices?
Do not sit for hours on end
Frequent breaks and movement can prevent strain.
True or False: Using headphones to block out surrounding sound can be damaging to your hearing.
True
It often leads to increased volume levels that can harm hearing.
What should you do to avoid eye strain when using a monitor?
Change the monitor settings and position it to avoid glaring reflections
Proper setup can significantly reduce eye discomfort.
