I got some decorative multi color led wire. It is broken at one place now. I need to connect the wire to complete the circuit. I am new to this and I am trying to learn. I tried twisting the wire so it would touch. But it didn't make the light to work. I tried twisting with aluminum foil also. It didn't work either. Please let me know how to connect these wires and whether these lights are of any specific types of led. What wire is this? Lead?
Small colored wires like this have an enamel coating that insulates the wire so that it does not short out to other wires or metal objects/surfaces. It is this coating that is making it so that you cannot just twist the wires together to complete the circuit.
The conventional way to rejoin wires of this ilk is to twist and solder. But first it will be necessary to very carefully scrape enamel coating off the surface of the wire using a sharp utility knife blade or safety razor blade.
LED's have a polarity if you connected them up backwards it would not work. LED's emit light in reverse bias mode and act as a diode in the forward bias mode. Hopefully when you hooked it up there was enough of a load on the string to limit the current or it may have blown the junction. Reverse bias the breakdown voltage is usually +1.2v in forward bias breakdown is ~.6v so if the current wasent limited the lower voltage breakdown allows more current flow and the magic smoke escapes. Twisting the leads should work if not plastic coated.