Demos by PIRA

5D10 Resistance Characteristics

  5D10.40Resistor analog: Marbles cascading down pin board.

5D20 Resistivity and Temperature

  5D20.15Resistance thermometer: Iron coil in liquid Nitrogen and flame varies current.
  5D20.30Effect of temperature on current in carbon or tungsten filaments.

5D30 Conduction in Solutions

5D40 Conduction in Gases

  5D40.10Large Jacob's ladder.
  5D40.10Same as above: Secondary used for small Jacob's ladder.
  5D40.25Copper nail and iron nail in a lemon using a multimeter.
  5D40.42Edison effect: Electrons are cast off from hot filament.
  5D40.80X-rays ionize electrode and discharge electroscope.