how to prepare a carbon arc lamp for a school project?

Question

using very less expensive materials

Answer 1

You can use two carbon electrodes of dry-cells. Make one end of both electrodes conical (like the tip-side of a pencil). Connect the other ends to a dc power supply such that the tips of both electrodes are neither too far nor touching each other (perhaps separated by a millimeter or two). Give sufficient voltage (I can't say exactly how much but it will depend on the separation between the two tips), and your carbon arc lamp is ready!!!

Answer 2

go there and search yourself.i have written link below