During night, while ascending the stairs you press the switch and the bulb lights up. ... In addition to 1.5 volt cells, one 3 volt bulb and a few copper wires or fuse wires, you mould need 2 two-way switches. ... Connect the switch and the bulb with wires as shown in the diagram and fix them on a plywood or wooden plank.
|Title||:||101 Science Experiments|
|Publisher||:||Pustak Mahal - 2004-12-01|