To determine whether a given substance is a conductor or an insulator.

Materials:

* A power source (such as a battery)

* A light bulb

* Two pieces of wire

* The substance to be tested (such as a piece of metal or plastic)

Procedure:

1. Connect the positive terminal of the power source to one end of a piece of wire.

2. Connect the negative terminal of the power source to one end of the other piece of wire.

3. Hold the two free ends of the wires together. If the light bulb lights up, the substance is a conductor. If the light bulb does not light up, the substance is an insulator.

4. Repeat the procedure with different substances.

Expected Results:

The light bulb will light up when the wires are connected to a conductor, but it will not light up when the wires are connected to an insulator.

Conclusion:

Based on the results of the experiment, you can conclude whether the substance is a conductor or an insulator.

Note:

Be careful when handling the power source. Make sure that the power source is turned off before you connect or disconnect the wires.