Electricity - Conductors, insulators, and semiconductors
https://www.britannica.com/science/electricity/Conductors-insulators-and-semiconductors
WEBElectricity - Conductors, insulators, and semiconductors: Materials are classified as conductors, insulators, or semiconductors according to their electric conductivity. The classifications can be understood in atomic terms. Electrons in an atom can have only certain well-defined energies, and, depending on their energies, the electrons are ...
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