Define input device.
Device sending data to computer.
Define output device.
Device receiving data from computer.
State one input-output similarity.
Both attached to computer / Both handle data.
State one input-output difference.
Input sends data; output receives data.
What is ergonomic keyboard?
Designed to reduce RSI/health problems.
Give concept keyboard use.
Fast-food restaurants / Single key per item.
Give numeric keypad use.
ATMs / POS terminals.
What is optical mouse?
Uses optical sensor to detect light changes.
What is tracker ball?
Ball moved while device stays stationary.
Give tracker ball use.
For users with RSI / Control rooms / Luxury cars.
What is touchpad?
Flat area for cursor control on laptops.
State touch screen advantage.
Easy to use / Space-saving / Cost-effective.
State touch screen disadvantage.
Limited options / Hygiene issues / Not for large data.
Resistive vs. capacitive touch screen.
Resistive: pressure sensitive. Capacitive: static electricity sensitive.
Scanner advantage.
Store images for editing / Faster than typing / Recover damaged docs.
Scanner disadvantage.
Quality limited by resolution / Can be slow.
Digital camera advantage.
See image immediately / Easy manipulation / Use in other devices.
Digital camera disadvantage.
Memory card corruption / Battery runs out.
Video camera vs. webcam.
Video camera stores video; webcam connects directly, no memory.
Microphone function.
Converts analogue sound to digital (via ADC).
Analogue vs. digital data.
Analogue: continuous (temperature). Digital: discrete (0,1).
Graphics tablet use.
Freehand drawings with stylus.
Graphics tablet advantage.
More accurate than mouse / Records pressure levels.
Graphics tablet disadvantage.
Expensive / Slower than pen/paper / Easily damaged.
