If electrical conductivity increases with the increase of temperature of a substance, then it is a:
Correct answer: A. Semiconductor
- A. Semiconductor
- B. Conductor
- C. Insulator
- D. None of the above
Explanation
In a semiconductor, increasing temperature releases more charge carriers, so electrical conductivity increases. In ordinary metallic conductors, increased lattice vibrations usually increase resistance and reduce conductivity. Students often choose conductor because metals are the best-known electrical materials, overlooking their opposite temperature behaviour.
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About Resistance and Resistivity
Resistance measures opposition to current in a conductor and follows R = V/I for an ohmic conductor, while resistivity is an intrinsic property of the material. Questions use R = ρL/A, examine effects of length, cross-sectional area and temperature, and distinguish resistance, resistivity, conductance and conductivity.
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