Chapter 5 - Output devices

Question 1

Output devices

Answer 1

Take data produced by the computer and turn it into a form that humans can understand

Question 2

Screens - LCD monitors

Answer 2

• back-lit using LEDs that consume little power and therefore produce less heat
• reach maximum brightness immediately
• brighter and sharper image with vivid colours
• last indefinitely, so are very reliable
• quite thin due to LEDs’ small size

Question 3

Screens - OLED

Answer 3

• can be used in wearable technology, electronic books and magazines
• made of plastic, therefore flexible
• quite thin
• brighter, need no backlighting, so consume less power
• slow to refresh, don’t last as long

Question 4

Printers - Laser

Answer 4

• high-quality, high-speed printing using powdered ink (toner)
• used in businesses, professional printing services
• colour printing is very expensive so best left to inkjet printers

Question 5

Printers - Inkjet

Answer 5

• spray dots of ink onto paper to create images
• cheaper than laser, but slower
• ink cartridges need replacement frequently

Question 6

Printers - Dot matrix

Answer 6

• matrix of pins strike the surface of paper through an inked ribbon
• can operate in damp and dirty conditions
• noisy, slow and print quality is poor

Question 7

Printers - 3D printers

Answer 7

• used to create car, aeroplane parts, medical equipment, prosthetic limbs
• produce prototypes, spare parts

Question 8

Multimedia projectors

Answer 8

• teachers can deliver the same quality lessons to multiple groups
• can present text, graphics, audio and video

Question 9

Computer speakers

Answer 9

• used to give verbal instructions in a sat-nav, read text from the screen for visually impaired people and give warning beeps and notifications

Question 10

Actuators

Answer 10

• motors used with sensors (sense change in environment and store analogue data)
• control a mechanism e.g. open a window, move an aircraft aileron