the bulb of a conduction tester lights when it is tested . Is tested material a conductor or an insulator
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How do you test if a material is a conductor or insulator?
Conductors and Insulators. In a conductor, electric current can flow freely, in an insulator it cannot. Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them.
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