3.1.1 Inputs and Output

1. Examine the wire diagram on the mini switch and describe how the diagram relates to the concepts of normally open and normally closed.

• When the switch is normally closed it goes from 0 and goes to 1 when pressed.
• When the switch is normally closed it does the reverse and goes from 1 to 0 when pressed.

2. If computers only understand digital signals, then how is a computer able to interpret the analog signals coming from the interface?

• Computers can understand analog signals by converting them to digital and then back again when needed.

3. Why does resistance decrease as the NTC Resistor becomes warmer?

• The resistance decreases because the warmer it gets the easier for the current to flow because the atoms in the resistor are at a higher energy level and when atoms are at a higher energy level they more easily release their valance electrons.