These toys were made from electronic junk
supplied by local repair shops. Old video recorders, cassette players,
walkmans, etc, provided motors, lights and switches.
ALWAYS make battery powered toys, mains
electricity from the wall plugs is dangerous!
Most of the toys below use a similar circuit; a
battery, wires, a motor and/or a light. Students have built windmills,
helicopters, lighthouses, cars, boats, planes, trucks, hypnotizing
machines, paragliders, co-ordination testers, a town with lighting, and
a model home with alarms.
PREDICT: Ask your
students "How many different ways can a battery, a bulb and pieces of
wire be connected?" "What happens if we connect a battery the other way
around? What happes if we do the same things using a motor? or a LED?"
OBSERVE: How the circuit
behaves with a bulb or motor or LED and compare when the battery is
connected the other way around..
EXPLAIN: What does this
show us? (Seniors might like to consider different types of resistor
networks and how they behave, eg, as sensors).