This exhibit demonstrates electricity needs a closed circuit to move around.
This is the nerve racking, dexterity game in which visitors try to guide an iron loop over a curved metal tube without touching it. At some points thickenings are made of diverse materials as woods or metals. At the non-conducting materials visitor can rest their loop. Electricity needs a closed circuit to flow. That means that all the wires and appliances in a circuit need to be connected in a loop. The Conducting Spiral is an open circuit that closes when you touch the spiral with the ring. This open system consists of: the spiral that is connected to an electricity source on one side; the ring that is connected to the same source and a bell. When the ring touches the spiral the circuit is closed, making electricity flow through the ring, passing and triggering the bell that is also part of the circuit.