Aim:
To test the given materials to know whether they are conductors or insulators What you need?
(Materials required):
a cell (power source), a bulb, connecting wires, wooden plank or thermocol sheet, two drawing pins, and the materials provided to test.
How to do?
(Procedure):
1. Connect a circuit on a wooden plank or on a thermocol sheet as shown in Fig.
2. Insert two drawing pins at A and B.
3. insert the given materials in the gap between A and B one after another.
4. With each insertion, check whether the bulb glows or not.
What do you see?
(Observation):
The bulb glows only when some materials like a safety pin, iron nail were inserted. It does not glow when the materials like paper, eraser were inserted. What do you learn?
(Result):
Bulb glows only when an electric current passes through the materials. So all the materials which made the bulb glow are conductors and the remaining are insulators.
