I found this picture after googling “simple electric circuit.” Classically, the starting place for teaching electricity is with a simple circuit. It is hard to go wrong with the classics, like a knife switch, lamp holder, and light bulb powered by a D cell. This will be built on a wood board to give it some permanence with the goal of it being played with and studied. I plan to add Fahnestock clips and wire with alligator clips to study conducting and insulating materials on the same circuit board. I think I found some competitive prices at Novatech International. However, I was disappointed that they charged $14 in shipping. It was practically a one stop shop for these educational parts. I plan to get the boards and screws at Home Depot. It is important for students to understand that electricity is the flow of electrons through conducting materials that is then converted to energy, in this case light. Sadly, even this simple circuit will cost $10 to make. Economic barriers are one of the hardest challenges to overcome in teaching science.