You are given a dry cell, a torch bulb with holder, wires and crocodile clips. How would you use them to distinguish between samples of metals and non-metals?

A torch bulb is fitted in a holder and connecting wires with crocodile clips and connected them to an electric circuit. Insert a piece of sulphur between the crocodile clip and bulk does not light up. This says that sulphur does not allow the electric current to pass. Now insert a piece of copper between crocodile clip and bulb will glow. This indicates that non-metal do not conduct electricity and metals conducts electricity