What happens when an insulator is wired in parallel with the bulb?

is the swich open or closed?

see other post.

When an insulator (a material that does not conduct electricity) is wired in parallel with a bulb, it has no effect on the circuit. This is because an insulator does not allow electric current to flow through it.

In a parallel circuit, multiple components are connected to the same two points in the circuit. Each component functions independently, meaning that the presence or absence of an insulator will not affect the other components. As a result, the bulb in this case will still function as intended, irrespective of the presence of the insulator.

To understand the status of the switch (open or closed), we need more information. The switch can be either open or closed, depending on how it is physically positioned. An open switch means the circuit is interrupted, and no current can flow through it. A closed switch means the circuit is complete, and current can flow through it.