This experiment is a demonstration, it serves to understand how the salt dissolved in water facilitates an optimum condition for the passage of the current between the two electrodes.
The working voltage for this experiment must be 230 volts DC or AC.
A light bulb 500W 230V or 230V 100W 5 bulbs in parallel between them ..
Two iron nails or other conductive metal.
Water and salt.
Two electric wires.