Insulators also contain electrons, but they are not conductors, Why?
An electric current is a flow of electric charges within a given material under the action of an applied voltage (electric field).
The capability of a material to conduct an electric current is described by the electric conductivity.
Answer and Explanation:
An electric insulator is a material characterized by a very low electric conductivity (high electric resistivity).
Unlike electric conductors, insulators contain electrons by a only few of them are free to move and then very little current flows
under the application of an external electric field.
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from Science for KidsChapter 6 / Lesson 28