output device

Question 1

How does actuator work (in ur own word)

Answer 1

-> component that outputs an action (usually a type of movement) that causes another device to operate
-> require DAC (digital-to-analogue) coverter

Question 2

uses of actuator

Answer 2

e.g. used in an automated system to move or turn on/off another device e.g. light

Question 3

How does digital light processing (DLP) projector work

Answer 3

-> uses light reflected form millions of little mirror -> split into RGB color -> output an image

Question 4

uses of digital light processing (DLP) projector

Answer 4

classroom projector

Question 5

how does Liquid crytal display (LCD) projector work

Answer 5

-> device that shines light from LED through crystals then through a lens to project an image onto a screen

Question 6

How does laser printer work

Answer 6

-> use a rotating drum and powered toner to ouput a document
-> a drum inside begins with a positive charge
-> a laser is shone to remove the positive charge from certain area that match exactly with the text and images
-> positively charge toner is applied to the drum and attract to the negative area created by laser
-> the sheet of paper (negatively charge) -> rolled over the drum
-> toner on the printing drum is transferrred to the paper
-> create text and images

-> the paper then goes through a fuser -> melt so the toner permanently fixed to the paper

Question 7

How does inkjet printer work

Answer 7

-> uses thermal bubble and piezoelectric technology
-> uses nozzle to propel ink droplets on paper
-> when the droplet is to be propelled, an electric current is sent to the piezoelectric crystal
-> the crystal pushed against a membrane which pushes it to the outlet of ink dispenser

Question 8

how does Light emitting (LED) screen work

Answer 8

-> uses LEDs as a backlighting, an array of light-emitting diode as pixels to output an image

Question 9

how does Liquid crystal (LCD) screen work

Answer 9

-> a screen that shines light through crystals to ouput an image
-> LCDs use a cold cathode fluorescent lamp (CCFL) -> provide the light to screen

Question 10

How does speaker work

Answer 10

-> digital sound signals produced by compute passes through a DAC
-> then passed through an amplifier to make sound louder
-> a device that ouput sound

Question 11

How does 3D printer work

Answer 11

-> device that uses laser to fuse small partilces into layers of material to ouput a 3D object