Electrical conductivity o is used to specified the electrical character of a material,it is the reciprocal of the resistivity,or[(m) It is indicative of the ease with which a material is capable of conducting an electric current. Ohm's law may be expressed as:J=o8 J is the current density,the current per unit of specimen area l/A,and is the electric field intensity,or the voltage difference between two points divided by the distance separating them.That is,=7
Electrical conductivity σ is used to specified the electrical character of a material, it is the reciprocal of the resistivity, or 𝜎 = 1 𝜌 [(Ω-m)]-1 It is indicative of the ease with which a material is capable of conducting an electric current. Ohm’s law may be expressed as: J=σε J is the current density, the current per unit of specimen area I/A, and ε is the electric field intensity, or the voltage difference between two points divided by the distance separating them. That is , 𝜀 = 𝑉 𝑙
Solid materials exhibit an amazing range of electrical conductivities,extending over 27 orders of magnitude. One way of classifying solid materials is according to the ease with which they conduct an electric current: ▣Conductors 107(0-m)-1 ▣Semiconductors 10-6-104(2-m)-1 ▣Insulators 10-10-10-20(2-m)-1
Solid materials exhibit an amazing range of electrical conductivities, extending over 27 orders of magnitude. One way of classifying solid materials is according to the ease with which they conduct an electric current: Conductors 107 (Ω-m)-1 Semiconductors 10-6 -104 (Ω-m)-1 Insulators 10-10 -10-20(Ω-m) -1
5.1.2 Semiconductivity The electrical conductivity of the semiconducting materials is lower than that of the metals; nevertheless,they have some unique electrical characteristics,it render them especially useful.The electrical properties of these materials are extremely sensitive to the presence of even minute concentrations of impurities.Intrinsic semiconductors are those in which the electrical behavior is based on the electronic structure inherent to the pure material.When the electrical characteristics are dictated by impurity atoms,the semiconductor is said to be extrinsic
5.1.2 Semiconductivity The electrical conductivity of the semiconducting materials is lower than that of the metals; nevertheless, they have some unique electrical characteristics, it render them especially useful. The electrical properties of these materials are extremely sensitive to the presence of even minute concentrations of impurities. Intrinsic semiconductors are those in which the electrical behavior is based on the electronic structure inherent to the pure material. When the electrical characteristics are dictated by impurity atoms, the semiconductor is said to be extrinsic