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I think the lesson on circuits could be used with a first grade class. Joyce suggested using non akaline batteries to so students would have less of a chance of having the wire heat up.  The students would be very interested in trying to get the circuits to work.  I think I could demonstrate the current by setting up dominoes and then putting a space and that would demonstrate an open circuit and then by eliminating the space it would demonstrate a closed circuit. However, you would need to explain how it would keeps repeating. You could also show how electricity takes different paths by having the dominoes hit two and then splitting in different directions but continuing the circuit.