Just clowning around with switches

Cardboard switch and application

In the early years, simple switches with pretty obvious mechanism are the thing. For a cardboard switch you need to cut two pieces of card each about 10 mm by 50 mm. Score one through the middle, then wrap both in kitchen foil. Use two drawing pins as shown to complete the switch. Add two wires and a bulb holder and you have a simple circuit. An extension which we have used with some success is to make a clown’s face with a card switch built in as the nose. Press the nose and the eyes light up. The Clown has two eyes and we need two bulbs. How can we wire up the circuit so that both bulbs will be equally brightly lit?

A further extension could be to construct a model car dashboard to provide a similar opportunity (this might be more appropriate at later stages).

Suppose we made a model cardboard dashboard to include a horn (buzzer), side lights and headlamps (lamps)? We might wire the horn in series but how would we have to wire the lights? We could also use a different but no less overt switching mechanism such as a paper-clip switch.

Later we might return to similar problems but seek to improve both depth and breadth of understanding.

Paper-clip switch