![]() A three-terminal device that has three legs is a transistor. A capacitor is a two-terminal device that stores some charge when a DC voltage is applied and does not allow direct current to flow through. Two terminals that conduct both alternating current and direct current are resistors. Thus, the valence band and conduction band are further separated from one another by an energy gap of 0.1eV.Īpart from the band gap, one of the primary difference between conductor, insulator and semiconductor is that the conductivity of semiconductor can be found to be between the conductivity of insulator and conductor.The terminals through which an electric current passes are LED or light-emitting diodes. Now, in semiconductors, the Fermi level can be seen to be situated between the valence band and conduction band. ![]() While in the case of insulators, the energy band gap is found to be extremely high,which can be given by Eg = 6eV. The valence band and conduction band in conductors is almost close to one another, thus its energy gap is Eg = 0. In fact, a wide forbidden gap (more than 5eV) can be found for insulators, while a narrow forbidden gap (about 1eV) for semiconductors and absolutely no forbidden gap in the case of conductors.
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