Answer / ashutosh mishra

Since large number of free electrons(required for flow of current)are available in conductors,current flows through conductors on application of external voltage.
Due to absence of free electrons in insulators,curent does not flow through insulators.

Answer / jagadeesh

Energy band gap is very large for insulators compared to conductors

Answer / anandhakrishnan t

In conductors, the free electrons present above the valence band according to the atomic structure, are more.
EG: copper(cu) - atomic no=29. It has 9 electrons(1s2,2s2,2p6.3s2,3p6,4s2,3d9) on the outermost orbit as free electrons

But in insulators, the free electrons present are less.
EG: magnesium(Mg) - atomic no=12. It has no electrons(1s2,2s2,2p6,3s2,3p6(0)) on the outermost orbit of free electrons.

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