Output Devices

Question 1

Inkjet printers

Answer 1

• Data from document is sent to printer
• ensures correct format
• check if printer is available
• data is sent to printer
• paper is fead
• Pinter head moves across page in four ink colours in exact amounts
• paper is advanced
• repeat until buffer is emtpty
• once done, send interupt

Question 2

laser printers

Answer 2

• used to print flyers high quality
• uses dry powder and static electrcity
• printing drum is given a negatice charge with a laser
• drum is coated with positively charged toner
• negative charged sheet is fed
• toner now sticks
• paper goes through a fuser
• discharge to remove electric charge from drum

Question 3

3D printers

Answer 3

• used to model solid objects that work
• made of resin
• uses CAD

Question 4

Actuators

Answer 4

Used to control sensors

Question 5

loudspeakrs and headphones

Answer 5

• Sound is passing digital data through a DAC and then simplified and then emerges from a loud speaker
• Voltage differences vibrate a speaker at different frequencies

Question 6

LCD monitors

Answer 6

• Liquid Crystal Monitors
• Diodes are grouped together as 3s
• Backlit using LED

Question 7

LED

Answer 7

• Reach max brightness immediatly
• sharpens image
• improves colour
• LED is thinner than CCFL
• consumer little power

Question 8

Types of Light projectors

Answer 8

• Digital light projectors or LCD projector
• used to project computer outputs

Question 9

Digital Light Projectors

Answer 9

• Uses micro mirrors
• Tilt towards light source when on and away when off
• This creates a dark and light source
• white light splits to primary colours

Question 10

LCD projectors

Answer 10

• Old
• Powerful beam of light coats the mirros and reflects at different wavelenghts
• Light is interpreted as values for green red and blue
• These 3 lights pass through 3 LCD screens