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Well, if you have a functioning (=closed) circuit, and introduce an unknown object, then if the circuit is still functioning (=closed) then the object is a conductor. If it stops working, then it's either an insulator or an very poor conductor.
You can test if something is an insulator or conductor by connecting a circuit with a power source and a light bulb. If the material allows the light bulb to turn on, it is a conductor. If the light bulb does not turn on, it is an insulator.
An insulator is an object that electricity, heat or sound cannot pass through. It is the opposite to conductor.
An insulator. More specifically, a thermal (heat) insulator, as opposed to an electrical insulator, which suppresses the flow of electricity.
insulator.
It is an insulator
insulator
is a pen a insulator of conductor
is water conductor or insulator
is water conductor or insulator
Plastic is an electrical and thermal insulator.
an insulator. that's why it's used in building