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2016-05-02T15:41:28+05:30

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Because all materials do not let electricity or heat to pass through them
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2016-05-02T15:45:35+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
all materials do not have free electrons on them so the electrons cannot move frely as electricity is flow of electrons all materials not act as conductors
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