A glass conductor

The video tutorial explains the structure and function of a glass base with embedded wires and a filament. It describes how the filament oxidizes and burns out in air, ceasing current flow. The tutorial demonstrates that glass, typically an insulator, can become a conductor at high temperatures, allowing current to pass through and causing it to glow. Additionally, it covers how metal can dissolve in glass and emerge on the surface when heated, and how the glass can melt and flow when sufficiently hot.

What happens to the glass when it is heated to a high temperature?

• It shatters.

• It remains unchanged.

• It turns into a conductor.

• It becomes a better insulator.

What is the role of the inert gas surrounding the filament?

• To prevent oxidation.

• To increase brightness.

• To cool the filament.

• To make the filament flexible.

What occurs when the filament is exposed to air?

• It becomes brighter.

• It oxidizes and burns out.

• It cools down.

• It becomes more conductive.

How does the glass demonstrate conductivity when heated?

• By becoming transparent.

• By emitting sound.

• By glowing due to electrical heating.

• By changing color.

What happens to the metal dissolved in the glass when it gets hot enough?

• It becomes brittle.

• It comes to the surface and looks shiny.

• It changes color.

• It evaporates.