Input Devices Flashcards
What are the uses of a keyboard?
1-Enters text using word processing document.
2-application where text has to be created
What are advantages of a keyboard?
1-Very reliable
2-Skilled typists input data quickly
3-cheap input device
What are the disadvantages of a keyboard?
1-Need typing skills
2-Time consuming, especially if user has not had enough practice
3-Cannot do diagrams or drawings
What are the uses of a Numeric keypad?
1-Application where only numeric data can be entered
2-Inserting PIN numbers using debit/credit cards (using an ATM for money withdrawal)
An example of a numeric keypad and its uses
Pinpad
1-Used at ATMs for money withdrawal
2-Used to pay the bill at retail stores
Advantages of numeric keypads
1-Easy and quick method to enter numbers
2-Easy to use by non literate people
Disadvantages of numeric keypads
1-Cannot input text
2-Limited functionality
Uses of pointing devices
Application for selecting data from menus list
3 Examples of pointing devises
1-Mouse
2-Touchpad
3-Trackerball
What are 4 Advantages of a mouse
1-Easy to use by non professionals
2-Not expensive
3-Quicker navigation then using arrow keys on a keyboard
4-Precise control
Name 5 Disadvantages of a mouse
1-Causes wrist strain after a while
2-Relatively slow for professional use
3-Cannot input text
4-Not accurate for drawing purposes
5-Needs a flat surface to operate
How does a Touchpad work?
It senses touch from a finger
Where is a Touchpad located
On a laptop
What are 2 functions of a Touchpad?
1-Saves work area that would be required by other pointing devices
2-Makes laptops more portable
2 Disadvantages of a touchpad
1-requires sensitive touch, which could be inconvenient for some people or environments
2-Cannot be used while wearing gloves
What are uses of a Trackerball?
1-Used with people with limited skills, such as children and disabled people
2-Used for medical equipment
What are 3 Advantages of a trackerball?
1-Easily used by Kids and Disabled people
2-Does not require free desk space like other pointing devices (mouse)
3-Reduces wrist pain
What are Disadvantages of a Trackerball?
1-Relatively slow for a professional user
2- Cannot input text
3- Limited availability
4- Less portable then some other pointing devices
What are uses of a Light pen
It’s a Drawing application that uses a graphical tablet
-for freehand drawings
-for retouching photographs
2 Advantages of a Light pen
1- People who have never used a computer adapt naturally to using a pen as an input device
2- Accurate for drawing purposes
A disadvantage of a Light pen
Only connects to a CRT screen
Uses of a Touch screen
Selecting from a limited list of options
Used in
- cafes
- Kiosks
- Tourism information
- Public transportation inquiries
3 Advantages of a Touch screen
1- User friendly and are easy to understand
2- Does not require an addition input device
3- Suitable for short answers or Yes/No responses
3 Disadvantages of a Touchscreen
1- Limited amount of data as only Yes/No responses can be made
2- Not suitable for office use
3- Unintentional touches on the screen could lead to errors
What are some uses of a remote control?
1-Used to enter data from a distance
2- to control devises such as
.DVD
.Recorder
.Music systems
.projectors
2 Advantages of a Remote control
1- Provides convenience for user to work away from the system
2- Useful for disabled people
2 Disadvantages of a Remote control
1- Can be easily misplaced
2- The remote and the system must be near each other with no obstacles between them
Uses of a Joystick
1- Used by pilots in flight simulators
2- Used in car driving simulators
3- used to play computer games
How does a Joystick work?
joystick moves and it senses it and converts it into coordinates
Advantages of a Joystick
1- Allows fast interaction which is needed in computer games
2- Provides a better experience while playing computer games
3- Well built Joystick are very durable
Disadvantages of a Joystick
1- Cannot be used to accurately select options from a screen
2- High quality Joysticks are expensive
Uses of a Graphics tablet
1- Used to input
- freehand drawings
- Designs
2- To retouch photographs
3- To work with CAD
Uses stylus (I think)
An Advantage of a graphics tablet
It can be used to accurately digitize drawings
Disadvantages of a Graphics tablet
1- Expensive
2- not portable
Uses of a Scanner
1- Entering hard copy pictures into a computer
2- Digitize documents
3- works with OCR (optical character reader)
examples of a Scanner
Flat bed
Hand held
Uses of a Flat bed scanner
Used to capture a full document
Uses of a hand held scanner
Used to capture part of a document
It’s portable
Advantages of scanner
1- Accurate
2- Gives high resolution
3- Fast method to capture printed photos as images
Disadvantages of a Scanner
1- Scanned objects take up more storage space — Then objects that have been digitized by a graphics tablet
2- expensive
What is an input devise?
It is any hardware device that allows the user to send data or instructions directly into the computer
Can an input device receive data?
No, an input device can send data to another device but cannot receive data from another device
Why are input devices fairly complicated?
Because they have to ensure the user can interact with the computer correctly
Why are input devices necessary?
Computers need input devices to get commands and data from users.
The user controls the devices
Uses of a Video camera
To input moving pictures into the computer
Advantages of a Video camera
1- Photos can be input directly to the computer system
2- portable
Disadvantage of a video camera
1- Expensive
2- Limited battery life
Uses of a Web cam
To input moving pictures into a computer from a fixed position
used for video conferences
Advantages of a Web cam
1- Not expensive
2- can be used for surveillance
3- allows face to face communication
Disadvantages of a Web cam
1- Requires special software
2- must be located with a Pc
3- may not have the best audio quality
Uses of a Microphone
1- Records voice for presentation
2- used in voice recognition
3- useful for disabled people to interact with the computer
Advantages of a Microphone
1- No need for typing
2- Can be used by disabled people
3- can be used by those who have their hands occupied
Disadvantages of a Microphone
1- Requires a quiet environment or it will pick up background noise
2- May cause echo if too quiet
3- May hear words wrong
Uses of Sensors
Controls and measures application
Examples of Sensors
1- Temperature sensor
2- Pressure sensor
3- Light sensor
Uses of Temperature Sensor
1- Automatic washing machine
2- Automatic Cookers
3- environmental monitoring
4- computer controlled greenhouses
Uses of a Pressure sensor
1- Burglar alarms
2- Environmental monitoring
Uses of Light sensors
1- Burglar alarms
2- Environmental monitoring
3- Computer controlled greenhouse
What use do Temperature, Pressure and Light sensors all have in common
They are all used for environmental monitoring
Advantages of Sensors
1- Allow for automatic response to be executed without any human intervention
2- Allows continuous monitoring
Disadvantages of sensors
1- If data logs break down some data could be lost
2- equipment is expensive
3- it need an ADC (analogue to digital converter) for it to be understood by the computer
