Input Devices

Question 1

Keyboard

Answer 1

• uses a standard layout (QWERTY)
• depends on human operator for speed of input
• concept keyboards have keys with pictures or words that can be programmed to carry out specific instructions

Advantages

• most computers supply one
• little training
• skilled typist = quick data entry
• specialist keyboards available e.g. gaming, ergonomic (to prevent RSI repetitive strain injury

Disadvantages

• easy to make mistakes
• time consuming if you can’t touch type
• not suitable for creating diagrams
• disabled people may find difficult to use
• excessive use = RSI

Question 2

Mouse

Answer 2

• aka pointing device
• moving, pointing, clicking, selecting
• easy to use and inexpensive
• designed to fit hand
• some use a mouse ball and built in movement sensors
• other use infrared or wireless tech
• experienced users may find “hot keys” i.e. ctrl P instead of selecting print from the menu

Question 3

Tracker pad

Answer 3

• aka touch-sensitive pad
• used on laptops as mouse alternative
• sensors underneath detect movement, direction and speed of finger

Advantages

• useful for laptops, portable
• fixed position in relation to keyboard
• short finger movements required

Disadvantages

• takes practice and skill
• no gloves
• moist, sweaty or calloused hands will disrupt signals