Input devices Flashcards
(46 cards)
What are input devices?
Allow data to be input into the computer
Keyboard?
Common type of input devices
It’s used to input text, commands and number into the computer. QWERTY is the most common type and ergonomic keyboards are designed to reduce Health related problems such as repetitive strain injury and carpal tunnel syndrome
Concept Keyboard?
Uses icons and phrases instead of standard letters. Is used in restaurants and fast food chains.
Mouse?
It’s a pointing device by which the user controls the movement of a pointer on the monitor. Has a left button to select, right for drop down and middle to scroll through documents easily and faster.
Touchpad
It’s a pointing device found in laptops. The pointer is controlled by the user moving their finger on it.
Trackerball?
Similar to a mouse but it’s operated by the user using a rotating ball on the left or the side of the device
Remote control
Used to control the operation of other devices such as a TV using infrared signals. The buttons on the keypad are used to select options.
Joystick
Like a mouse. By gripping the stick a pointer on the screen can be controlled. Buttons are used to make selections.
Driving wheel
It connects to a computer via a USB port. The wheel allows you to simulate the turning of a steering wheel and there are brakes and accelerators.
Touch screens
The user simply touches icons or options on the screen and the selection is made without the need of a pointing device
Scanners
Used to enter data from hard copy into a computer. The most common type of scanner is a flatbed scanner with a glass panel and lid. The hard copy is scanned by a light source and converted to a computer readable image
Digital cameras
The images clicked at high quality photos and are stored in a SSD.
Microphones
Sounds are inputted and manipulated. Analogue signals for the user’s voice is converted to digital signals, a language the computer understands (binary) This is usually done by an ADC (analogue to digital converter)
Sensor
Inputs data of a physical quantity that continuously changes. Data is converted by ADC
Graphics tablet
Used with a stylus to produce free hand drawings.
Webcams
Webcams are directly connected to the computer and have no memory. They’re like video cameras
Light pens
They contain sensors that send signals to a computer when light changes are detected. They only work with CRT monitors. They are refreshed 50/secs to determine the position of the light pen.
Advantages and disadvantages of Keyboard
Fast data entry
Easy to use
Can be difficult if user has limited wrist movements
Uses valuable desk space
Uses of keyboard
To enter text or numbers in the computer
Advantages of concept keyboard
Fast data entry
Waterproof
Temper resistant
Numeric keypad
Faster than standard keyboard
Small so portable
Small keys make typing different
Order of numbers isn’t intuitive
Uses of numeric keypad
In ATM
POS
Chip and pin devices
Advantages and disadvantages of mouse
Don’t need large desk space
Faster than keyboard
Difficult for people with restricted hand movements
Easy to damage and clogged up with dirt
Uses of mouse
Controlling position of pointer on screen
Opening, closing software
