Filters and Rectifiers Concept

Demonstrations in Filters and Rectifiers

Large vacuum tube rectifier mounted on wooden base with binding posts. Clear glass envelope reveals internal plate structure surrounding the filament. A label is visible on the base.

Simple Rectifier

A large vintage vacuum tube rectifier of the type used in battery chargers illustrates thermionic emission and one-way current flow. The clear glass envelope makes the filament (cathode) and plate …
Long-exposure photo of the word "Physics" written in the air with the revolving neon bulb, showing discrete dots from the 120 Hz flashing
Safety

Revolving Neon Bulb

A neon bulb on an extension cord appears steady when stationary, but when revolved in a circle the discrete 120 Hz flashing becomes visible. Students see directly that AC voltage …