Output Devices

Question 1

What is an output device?

Answer 1

An device that takes data produced by the computer and turns it into a from that humans can understand

Question 2

What is a different type of output device?

Answer 2

An actuator, which might respond to an input signal to a turn on a sprinkler, open or close windows in a greenhouse or perform any number of other actions

Question 3

What are some common examples of an output device?

Answer 3

Screens, printers, multimedia projectors, speakers and actuators

Question 4

What are the different types of screens?

Answer 4

LCD monitor and, Organic LED (OLED) screens

Question 5

What does LCD stand for?

Answer 5

Liquid Crystal Display

Question 6

How does an LCD work?

Answer 6

LCD monitors contain groups of red, green and blue diodes to from each pixel, the screen is typically back-lit musing light-emitting diodes (LEDS)

Question 7

What is the advantages of LCD monitors over older technology?

Answer 7

They reach their maximum brightness almost immediately
the image is sharper with more realistic and vivid colours
they produce a brighter light which leads to better picture definition
since LEDS are very small, screens can be much thinner in construction
They last almost indefinitely which makes the screens much more reliable
They consume very little power and therefore produce very little heat as well as reducing running cost

Question 8

What are OLED screens compared to LCD or LED screens?

Answer 8

OLED are brighter, thinner and lighter than traditional LCD or LED screens

Question 9

What is The material used for OLED screens?

Answer 9

The screen is plastic rather than glass, so they are flexible

Question 10

What are the advantages OLED screens have over LCDs?

Answer 10

When made of plastic rather than glass, they are theoretically flexible enough to print onto clothing
They are much thinner
They are brighter and need no backlighting, so they consume less power, which translate into longer battery life
LCDs can be slow to refresh, OLEDs respond up to 200 times faster
They produce truer colours through a much bigger viewing angle, unlike LCDs where the colours darken and disappear if you look from the side

Question 11

What are some disadvantages of OLEDs compared to LCDs?

Answer 11

OLEDs do not last as long, tending to wear out around 4 times faster than LCDs
They are sensitive to water, which is a potential problem in a cellphone

Question 12

What are the different types of printers?

Answer 12

Laser printers, inkjet printer, dot matrix printers (also known as impact printers) and, 3-D printers

Question 13

What does a laser printer offer?

Answer 13

High-quality, high speed printing

Question 14

What is the function of a laser printer similar to?

Answer 14

That of a photocopier, using powdered ink called toner

Question 15

Where is a laser printer commonly used?

Answer 15

Due to it becoming increasingly affordable, it is frequently used as a home printer, in businesses and in professional printing services

Question 16

How many toner cartridges does a laser printer have?

Answer 16

Four (Cyan, Magenta, Yellow and Black or CMYK)

Question 17

Why are colour laser printers far more expensive to run than black and white versions?

Answer 17

When the paper goes through the printing process, it does it four more time than the black and white one, as once for each colour

Question 18

In what area does a laser printer become limited?

Answer 18

For print jobs other than text because of the quality of the print produced, which at about 120 dpi makes photorealistic prints impossible and best left to inject printers

Question 19

How do inkjet printers work?

Answer 19

is sprays minute dots of ink onto paper to create an image

Question 20

What happens when Inkjet printer has high resolution (dots per inch) of the model?

Answer 20

With the number of colour cartridges used and the quality o the paper being used and the quality o the paper being used, they can produce excellent, photo-realistic images

Question 21

What is the advantages of Inkjet printers compare to laser printers?

Answer 21

Inkjet printers are cheaper, and is preferably used to produce high quality photographic images

Question 22

What is the disadvantages of Inkjet printers compare to laser printers?

Answer 22

Inkjet printers ae slower and the ink cartridges have to be replaced quite frequently

Question 23

What are dot matrix printers also known as?

Answer 23

Impact printers

Question 24

How does dot matrix printers work?

Answer 24

The print head has a matrix of pins which strike the surface of the paper through an inked ribbon to from letters

Question 25

What is some advantages of dot matrix printers?

Answer 25

These printers are useful when multi-part stationery is required and they can operate in damp or dirty environments

Question 26

What is some disadvantages of dot matrix printers?

Answer 26

They are noisy, slow and the print quality is poor

Question 26

What are some examples of output devices?

Answer 26

Multimedia projectors and computer speakers

Question 27

What is actuators?

Answer 27

Actuator are motors that are commonly used in conjunction with sensors to control a mechanism for example turning a wheel, starting or stopping a pump or controlling devices in a ‘smart home’