On the basis of electrical conductivity, solids can be classified into three types:(1). Conductors,(2).insulaters,(3) semiconductors.
(1) conductors: the solids which allow the passage of electric current are called conductors. They've conductivities in the range 10⁴ to 10⁷ Ω⁻¹m⁻¹
(2) insulators: the solids which do not allow the passage of electric current through them are called insulators. They have very very low conductivities range from 10⁻²⁰ to 10⁻¹⁰ Ω⁻¹m⁻¹.Eg. wood ,sulphur, rubber etc.
(3) semi-conductors: the solids whose conductivity is between this of typical metallic conductors and insulators and semi-conductors. The semiconductors have conductivity in the range of 10⁻⁶ to 10⁴ Ω⁻¹m⁻¹
(1) conductors: the solids which allow the passage of electric current are called conductors. They've conductivities in the range 10⁴ to 10⁷ Ω⁻¹m⁻¹
(2) insulators: the solids which do not allow the passage of electric current through them are called insulators. They have very very low conductivities range from 10⁻²⁰ to 10⁻¹⁰ Ω⁻¹m⁻¹.Eg. wood ,sulphur, rubber etc.
(3) semi-conductors: the solids whose conductivity is between this of typical metallic conductors and insulators and semi-conductors. The semiconductors have conductivity in the range of 10⁻⁶ to 10⁴ Ω⁻¹m⁻¹
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