Electrical Conductors and Insulators – A Simple Test

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One property of materials is whether they allow electricity to flow through them. A material that allows electricity to flow through it, like the copper used to make wires, is called an electrical conductor. A material that does not allow electricity to flow through it, like the plastic surrounding electrical wires, is called an electrical insulator.

You can test if a material is an electrical conductor or insulator using a simple circuit. When aluminum is placed between the alligator clips and the switch is closed, the bulb lights up, indicating that the foil is an electrical conductor.

Connect a rubber band and close the switch, and the bulb does not light up. The rubber band is an electrical insulator.

Connect a metal screw and close the switch, and the bulb lights up. The metal screw is an electrical conductor.

Connect a metal quarter and close the switch, and the bulb lights up. The metal quarter is also an electrical conductor.

Connect a plastic block and close the switch, and the bulb does not light up. The plastic block is an electrical insulator.

Try setting up your own circuit to test the electrical conductivity of different materials. Then predict, test, and classify the objects.

Thanks for learning!