2.3 : Output devices and their uses Flashcards
1
Q
what does CRT stands for?
A
- cathode ray tube
2
Q
what is the use of CRT monitors ?
A
- used as a primary output display for computers
3
Q
what are the advantages of CRT monitors ?
A
- good resolutions
- can be used with light pen
- cheaper than TFT monitors
- used when multiple people need to view the screen
4
Q
what are the disadvantages of CRT monitors ?
A
- they are heavy which causes health hazards for example when moving the screen
- they generate a lot of heat which can make the room hotter in the summer
- flickers can cause headaches
- glare on the screen may be a problem
- they are bulky and take a lot of room space
5
Q
what does LCD stands for ?
A
- Liquid Crystal Display
6
Q
what is the use of LCD / TFT ( thin film transistor) monitors ?
A
- LCD monitors have taken over from CRT as the primary output display for computers, also primary output for monitors
7
Q
what are the advantages of LCD monitors ?
A
- they are thin so they take less desk space
- they are cheaper to run as they don’t consume as much power as CRT
- they don’t generate as much heat as CRT
- they are ideal when one person needs to view the monitor
- can be positoned in the way that suits the user as its size is not much
8
Q
what are the disadvantages of LCD/TFT monitors ?
A
- the resolution may not be as good as CRT
- if they get damaged it is generally cheaper to replace them rather than fixing them which is bad for the environment
- they cant be viewed from different angles
9
Q
what does IPS stands for ?
A
- in plane switching displays
10
Q
what is the use of IPS ?
A
- it is a technology used with LCD ,it used by creative professionals
11
Q
what are the advantages of IPS monitors ?
A
- wider viewing angle so its good for group watching
- thinner than CRT monitors
- less glare than CRT so can be used in good-lit rooms
- energy-efficient when compared to CRT monitors
- colour reproduction is better than other monitors
12
Q
what are the disadvantages of IPS monitors ?
A
- more expensive than other monitors
- not as efficient as LED monitors
- not as good as graduating shadows of colour compared to an LED monitors
- ## not as good in dim-lit spcaes
13
Q
what does LED stands for ?
A
- light emitting diode
14
Q
what is the use of LED monitors ?
A
- they are mainly used for outside use , like billboards , destination signs and store signs due to their level of brightness
15
Q
what are the advantages of LED monitors ?
A
- they are more energy efficient than LCD and CRT monitors
- due to their strong light they make colours more defined
- they are much lighter than CRT monitors
- better picture quality which makes them good for watching sports or playing video games
16
Q
what are the disadvantages of LED monitors ?
A
- they are more expensive than LCD monitors
- if viewd from the side they have poor visibilty
17
Q
what is the use of a touch screen ?
A
- touch screens is used as output display for computers , as well as it being an input device which users can interact with using their fingers or a special pen , it is used in
- mobile phones / tablets
- and at POS terminals in stores , banks etc.
18
Q
what are the advantages of touch screens ?
A
- no need for additional input device
- no need for extra buttons
- the interface is generally easy and simple to use
- zoom in and rotation possible
19
Q
what are the disadvantages of touch screens ?
A
- screen can become damaged ,dirty or less visible
- generally not good for high volumes of input when compared to a keyboard
20
Q
what are multimedia projectors ?
A
- used when projecting signals from various ( computers , TV’s ) devices onto a large screen
- used in
- classrooms
- home ceinma systems
- offices
- traininng presentions
21
Q
what are the advantages of multimedia projects ?
A
- many people can gather around one screen - the focal point of a classroom
- able to project onto a bigger screen and letting more people to see
22
Q
what are the disadvantages of multimedia projectors
A
- quality and resolutions may not be as good as other devices
- expensive and hard to set up
- obstacles can block the prjection
23
Q
what are the use of a printer ?
A
- printers are used to provide users with output in hard copy form
this means that the output is printed on paper
24
Q
what are the use of laser printer ?
A
- when high volume of printing is required, ex :
- schools
- offices
25
what are the advantages of laser printers ?
- prints quietly
- prints in fast speed espcially if high volume output is needed
- tonner lasts longer than ink-jet cartidge
- cost effective per page
- the quality
26
what are the disadvantages of laser printers ?
- bigger than an ink-jet printers
- if user is buying coloured laser printers it is very expensive
- power consumption is high
27
when do we use Ink-jet printers ?
- when low-volume output is needed, ex: home offices
| - homework one page/image
28
what are the advantages of ink-jet ?
- they are cheaper than laser printers
- they have good quality
- quite
- smaller than a laser printer
- they do not produce ozone or organic vapours which can lead to health problems
29
what are the disadvantages of ink-jet printers ?
- ink runs faster and is more expensive to change than laser printer ink
- slow printing when compared to laser printers
- ink smudges`
30
how does a dot-matrix printer work ?
- it uses a print head which presses against an ink ribbon while its moving back and forth
31
where do we use dot-matrix printers
- shop reciepts
- airline tickets
- when making copies ( carbon copies )
32
what are the advantages of a Dot-matrix printer ?
- cheap to run and maintain
- when making carbon copies
- not affected by heat nor dust
33
what are the disadvantages of Dot-matrix pritners ?
- expensive to buy
- noisy
- slow printous
- low quality
34
what are wide format printers ( graphplotters ) ?
- they are printers which are generally used when large formats are required , ex :
- billboards
- banners
- signs
- posters
- photographs and arts
35
what are the advantages of wide format printers ?
- high resolution when compared to ink-jet and laser printers
- can print wide formats
- cheaper since it allows business to print inhouse rather asking another company to print it for them which is more expensive
36
what are the disadvantages of wide format printers ? -
- expensive to buy and maintain
| - they are large in size so they require space
37
Discuss the advantages and disadvantages of using a Laser, Inkjet, wide format and dot matrix printer ?
Laser printers can provide fastand high quality printing. Typically laser printers are used to print in high volumes. However the printer will be more expensiveto buy compared to an Inkjet printer and also the toner will cost more. The inkjet also provides high quality printinghowever it prints much slowerthan the laser printer and therefore is normally used when printing in low volumes. Wide format printers are used to print very large printoutsin high quality. The Wide Format printer will be typically the most expensive printer to purchase and maintain. The advantage for the dot matrix printer is that it can work in hot and dusty conditionsand can print carbon copies. However the printing quality is quite poorcompared to the other printers. In addition the printing time is also much slower comparedto the laser and inkjet computer.
38
what are 3D printers ?w
they are used to build solid objects by building layer upon layer , ex :
- prosethtic limbs
- medical applications
- construction
- fashion and arts
- manufacture part
39
what are the advantages of 3D printers ?
- fast to produce prototypes
- can be used to produce parts that are not made anymore
- artificial organs can be made
- items can be customized
40
what are the disadvantages of 3D printers ?
- countrfiet products can be produced
- can be used incorrectly for wepoans for example if in the wrong hands
- can be very expensive and maintain
41
what are speakers ?
- they are required to output sound for video conferncing , videos , video games , etc.
42
what are the advantages of a speaker
- can amplify sounds
- some have bluetooth technology which means they can be used wirlessly
- and some of them have surrond sound to give a more realistic experience
43
what are the disadvantages of speakers ?
- they are not as personal as headphones as they can be heard by everyone
- if a high volume is played and the amplifier is weak the speakers may get damaged
44
3D printers are being used for producing personalisedprescription drugs.
(a) Give two advantages of using 3D printers for this purpose.
b) Give two disadvantages of using 3D printers for this purpose.
a ) The tablets can be customisedto meet the individual needs. Using the 3D printer would make it easier to change the percentages of drugin the tablet. The tablets can be produced in massproduced or small batchestherefore reducing waste. Patients would receive their prescriptions quicker.
b) The costof buying the 3D printer is expensive. The materialsfor printing are also expensive. On the other hand 3D printers can be used for illegal production of drugs. In addition not all 3D printers created to date can not complete this task.
45
what are actuators ?
- they are part of the control process , digital signals are sent by the computer to the actuator to affect or control the real world
46
list some of the actuator and their use ?
- motor ( spins things around ) : used in washing machines , controlling fans and in controlling robotics arm in manufactring
- lights ( to generate light ) : used in security light , dashboards and in light in greenhouses
- heater ( increases temp) : used in controlling the temp of central heating system , to control temp in ovens and greenhouses
- buzzer ( to create noise) : used in burglar alarms and in house appliances , and in sports events / game shows
