Question

Where are charge carriers supplied, and where do they flow, in semiconductor devices?

Options

• Electrons are supplied by a heated cathode and flow in a vacuum

• Charge carriers are supplied by a grid and flow through a large evacuated space

• Electrons are supplied by air molecules and flow in the inter-electrode space

• The supply and flow of charge carriers are within the solid itself

Answer 1

In semiconductor devices, both the supply and flow of charge carriers are within the solid itself. Vacuum tubes instead obtain electrons from a heated cathode and make them flow in a vacuum.