The resistivities of various common materials are
listed in Table. Materials are classified as conductors, semiconductors and
insulators depending on their resistivities, in an increasing order of their
values.
Metals have low resistivities in the range of 10–8
Ωm to 10–6 Ωm.
At the other end are insulators like ceramic,
rubber and plastics having resistivities 1018 times greater than
metals or more.
In between the two are the semiconductors. These,
however, have resistivities characteristically decreasing with a rise in
temperature.
The resistivities of semiconductors are also
affected by presence of small amount of impurities.
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