[TexasGator]

Did you not understand the analogy of the switch?

Insulator == OFF.

Conductor == ON.

Think!

Mechanical switches transition from insulators to conductors!

Vacuum tubes transition from insulators to conductors!

Transistors transition from insulators to conductors!

[Fireone]

I understand that a switch is a mechanical break between two conductors, not a property of the material the switch is made of.