3.2 input and output devices Flashcards
what is meant by an input device
- hardware components
- allow user to interact with computer system
why is input device required
- so user can input data/commands
what input device is used to input hard-copy documents
2D scanner
what input device is used to input solid objects
3D scanner
what are the types of touch screen
- resistive
- capacitive
- infra-red
what is meant by an output device
- hardware components
- receive info from computer system
- present to user in understandable form
why is output device required
- enable computer to communicate results
- of processed data/commands
what device outputs mechanical processes
actuator
what are the types of projector
- digital light processing (DLP)
- liquid crystal display (LCD)
what are the types of printer
- inkjet
- laser
what are the types of screen
- light emitting diode (LED)
- liquid crystal display (LCD)
what device outputs sound
speaker
what is meant by a sensor
- type of input device
- measure physical property of environment
purpose of acoustic sensor
record sound data
purpose of accelerometer
measure objects acceleration/deceleration and motion
purpose of flow sensor
measure flow of liquid/gas
purpose of gas sensor
measure amount/level of any gas in environment
purpose of humidity sensor
measure water vapour in air or any sample
operation of IR sensor (active)
- use invisible IR beam
- when beam broken/disturbed, changes amt of IR light reaching detector
purpose of IR sensor (passive)
detect heat emitted by any object
purpose of level sensor
detect level of solid, liquid, gas
purpose of light sensor
detect level of light
purpose of magnetic field sensor
detect changes in magnetic field
purpose of moisture sensor
detect water content
purpose of pH sensor
measure acidity/alkalinity
purpose of pressure sensor
measure pressure applied
purpose of proximity sensor
detect nearby objects around sensor
purpose of temperature sensor
measure temp of environment
