output devices

Question 1

what are three different types of printers

Answer 1

inkjet , laser and 3D printers

Question 2

how do inkjet printers work

Answer 2

1- it uses liquid ink cartridges
2- uses thermal bubble
3-rollers are used to move the paper
4- uses a moving print head that sprays ink onto the paper
5- different colored inks are mixed to create required colors

Question 3

how do laser printers work

Answer 3

1- they use toner cartridges
2- they use charged print drum
3- they use static electric charges
4- toner is fused onto the paper

Question 4

when are inkjet printers used

Answer 4

they are used for low quantity of documents

used for photographs

Question 5

when are laser printers used

Answer 5

used for high volume quality output

Question 6

when are 3D printers used

Answer 6

they are primarily used in CAD (computer aided design)

Question 7

how do 3D printers work

Answer 7

a solid object is built up layer by layer using materials like powdered resin, powdered metal, paper or ceramic powder

Question 8

how does binder 3D printing work

Answer 8

it involves using a binder (a type of glue) to build up a solid layer

Question 9

what are 2D/3D cutters

Answer 9

they are used to cut materials to form 3D objects and are controlled by computers

Question 10

how do loudspeakers and headphones work

Answer 10

sound is produced by passing digital data through digital to analogue converter then through an amplifier

Question 11

what does LCD stand for

Answer 11

liquid crystal display

Question 12

5 advantages of using LED and LCD screens

Answer 12

they create brighter image
higher resolution
thinner screen 
uses less power 
lasts longer

Question 13

what does OLED stand for

Answer 13

organic light-emitting diode

Question 14

what are advantages of using OLED screen

Answer 14

the layers are thinner, lighter and more flexible
they are made from plastic so they are lighter
brighter than LED
they use less power

Question 15

name 2 different types of projectors

Answer 15

DLP (digital light projectors) and LCD

Question 16

how do DLP projectors work

Answer 16

they use millions of micro mirrors which can switch on and off thousand times a second creating shades of grey. Color filters are used to convert these shades of grey into colors which are projected onto a large screen

Question 17

how do LCD projectors work

Answer 17

1- they use chromatic-coated mirrors which reflect light at different wavelengths.
2- Three different light components pass through 3 LCD screen
3- images are then combined using a prism to create full color image
4- image passes through the projector lens onto a big screen