An effective way to help children learn the basic properties of an electric bell is through a practical science project that teaches them how the bell works and why. An electric bell is made to ring by passing a current through an electromagnet, which become magnetized and attracts a small metal hammer within the bell unit. When this hammer moves it strikes the bell and makes it ring, however it also breaks the circuit, demagnetizing the electromagnet. The hammer returns to its position in the circuit, reconnecting it and repeating the process. The full process happens very quickly and produces the intermittent ringing associated with electric bells. Have the children experiment with removing wires from the circuit and observing when a circuit is complete and incomplete. Continue the project by having the children build their own circuits with electric bells in series: connected together in a chain on a singly branched circuit or in parallel: connected on individual branches of the main circuit. Have the children to observe the difference between the two types of connections.
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