Water Circuit Board

• A simple analogue apparatus demonstrating the fundamentals of flow of electric current through a conductor.
• A large board has a small network of clear plastic pipes, which is analogous to the electrical circuit and a low-voltage electric pump that circulates the water through the ‘circuit’ of plastic tubing connected to glass tubes of different bores representing resistances.
  
• Across these two resistances is a detachable manometer to show the potential difference.
• Just adjacent to the resistance tubes is a tapered tube discharging into a funnel representing the rate of flow of to indicate the current.