Printers

Question 1

Inkjet Printer

Answer 1

Ink is heated which expands into a bubble. The bubble is pushed through the nozzle onto the paper. Bubble colapses.

Question 2

Capacitive Touch Screen

Answer 2

Electrical Charge is spread across screen. Electrical sensors are used to read electrical field. When finger touches screen, it affects the current (conductivity of object). Coordinates can be calculated.