Question

7. How do you test the materials given to you, to know whether they are conductors or
insulators?
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Answer 1

Answer:

Touch the open ends of the two wires to each other to form a circuit and test the bulb. Touch the two open ends of the wire to each material you are testing, one at a time. If the bulb lights up, it is a good conductor. If it doesn't, it is a good insulator.

Explanation:

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Answer 2

Answer:

In a conductor, electric current can flow freely whereas in an insulator it cannot. Metals such as copper are typically conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them. So if the current is flowing through the material then it is a conductor.