Traffic Lights
Materials:
We used cardboard, paint, black crepe paper, wires, one battery, three bulbs, paper clips, three bulb holders, spilt pins, cellotape, sticky back tape, three sections from an egg carton, green red and orange paint and insulating tape.
Method:
We cut out some cardboard and cut out three holes in it. We covered the cardboard in black crepe paper. We painted three sections from an egg carton, three different colours, red, green and orange. We stuck three bulbs in the bulb holders and pushed them through the holes in the cardboard. We pushed the coloured sections over the bulb – red, orange and green - and stuck them to the black tower.
For every bulb we joined two wires. One wire from each bulb went to the next bulb. The end bulb was connected to a battery each bulb was connected to a split pin to make the other side of the switch. The battery was also connected to a split pin to make the other side of the switch. We joined all the wires together with insulating tape.
We stuck the battery to the inside of the tower and we stuck the four split pins into the side of the tower. The three from the bulbs in a line and the other one from the battery opposite. If you touch a paper clip between the battery split pin and any of the bulb split pins you close the circuit and that bulb will light.
This all sounds a bit confusing. If you look at our drawing of the circuit it will make sense.
by C., D. and J.