Chapter 3.2 B - Output devices FINAL BOARDS

Question 1

What is an actuator

Answer 1

an output device that converts electrical energy into mechanical movement

Question 2

What is a solenoid

Answer 2

Coverts electrical signal into magnetic field producing linear motion.

Question 3

Types of motion caused by actuators

Answer 3

Rotary or Linear

Question 4

Adv of a DLP

Answer 4

Higher contrast ratios
More durable
Quieter running than an LCD
Smaller and lighter

Question 5

Disadv of a DLP

Answer 5

Don’t have grey components in image
Colour saturation compared to LCD proj is lower

Question 6

Adv of an LCD proj

Answer 6

sharper images than a dlp
better colour saturation
more efficient in energy use and gen less heat

Question 7

Disadv of an LCD proj

Answer 7

Limited life span

Degrade over time

Question 8

2 types of printers

Answer 8

Inkjet

Laser printers

Question 9

2 Types of inkjet tech

Answer 9

Thermal bubble
Piezoelectric

Question 10

What are 3D printers used for

Answer 10

to produce solid objects that actually work

Question 11

Two types of binder 3D printing

Answer 11

Additive - adding materials layer by layer
Subtractive - removing materials layer by layer

Question 12

What is Direct 3D printing

Answer 12

uses inkjet technology; a print head can move left right up and down to build layers.

Question 13

How to create an object using a 3D printer

Answer 13

Make a CAD design

The drawing is imported to a software that prepares it in a format that the 3D printer can understand

The 3D printer is first set up to allow the solid object to be made

Then the object is built up in layers.

Object is prepared and left to cure after it has been made

Question 14

Uses of 3D printing

Answer 14

Prosthetic limbs

Reconstructive surgery (face surgery) - is more precise since they can fit the skull exactly

Aerospace - lightweight and precision parts

Fashion and art

Making parts that are no longer in production

Question 15

What is an LED screen

Answer 15

A screen made up of tiny light emitting diode which are either red, green or blue in colour.

Question 16

Use of LEDs

Answer 16

Large outdoor displays

Question 17

What is an LCD screen

Answer 17

Screens made up of tiny liquid crystals which make up an array of pixels that are affected by changes in applied electric fields

Question 18

What is CCFL (LCD)

Answer 18

cold cathode fluorescent lamp - Back-lit method LCD uses.

Question 19

Why LED backlighting better than CCFL

Answer 19

Max brightness reached immediately

Whiter light that sharpens the image and makes the colours appear more vivid; CCFL had a slightly yellowish tint

Brighter light - better colour definition

More durable

Consume little power - produce less heat and consume less energy

Question 20

OLED full form

Answer 20

Organic Light emitting diode

Question 21

ONE BIG IMP CHARACTERSITIC OF OLED

Answer 21

Very thin screens - can even be folded

Question 22

Advantages of OLED

Answer 22

Thinner, lighter and more flexible

Give brighter light

Do not require backlighting

Very large field of view - about 170 degrees

Question 23

What is a speaker

Answer 23

Output device that produces sound

Question 24

Why is a projector used

Answer 24

used to project computer output onto larger screens or interactive whiteboards

Question 25

Where are projectors often used

Answer 25

presentations
multimedia applications

Question 26

What is thermal bubble (inkjet)

Answer 26

Tiny resistors heat the ink up. This causes the ink to expand into a bubble. Ink is ejected onto the paper. A vaccum is created when the bubble bursts which allows fresh ink to be drawn from the vaccum

Question 27

What is piezoelectric

Answer 27

Crystal is located at the back of the ink reservoir for each nozzle. The crystal is given a tiny electric charge which makes it vibrate. This vibration forces ink to be ejected onto the paper.

Question 28

Process of an inkjet printer

Answer 28

Doc sent to printer driver

Printer driver makes sure doc can be understood

The printer driver checks to make sure the printer can print (busy, out of paper, available, etc)

Data is sent to temp memory of printer called printer buffer

Sheet of paper is fed into the paper.

As the sheet goes through the printer, the printer head moves from side to side across the paper printing the text or image

This process repeats until the data in the printer buffer is empty

The printer sends an interrupt to the CPU for more data to be sent to the printer

Process repeats until entire doc is printed

Question 29

What is a laser printer

Answer 29

Uses dry powdered ink instead of liquid ink.
Uses static electricity to produce texts and images
Can print entire sheet in one go.
4 toner cartridge: blue, cyan, magenta, black.

Question 30

When are inkjet printers used

Answer 30

one-off photos
if only a few pages of good quality, colour printing is needed

Question 31

When are laser printers used

Answer 31

produce high quality printouts and are very fast when making multiple copies of a document

high volume printing

Question 32

advantages of laser printing over inkjet

Answer 32

they have large toner cartridges and large paper trays