A wire having very high value of conductance is said to be____________________?
Correct answer: A. very good conductor
- A. very good conductor
- B. moderately good conductor
- C. an insulator
- D. no specific criterion available
Explanation
Conductance is the reciprocal of resistance, G = 1/R, so a very high conductance means the wire offers very little opposition to current and is therefore a very good conductor. An insulator is the likely mistaken choice because it may be associated with electrical properties generally, but an insulator has very low conductance.
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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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