. What is Electric resistance and Conductance

Best Answer

Consider a conductor of length l and apply a constant potential difference V across the conductor. Hence electric field inside the conductor is V / l . Current density j=i/A and j E . So


Object having some resistance is called resistor. A perfect conductor would have zero resistivity (and hence zero resistance) and a perfect insulator would have infinite resistivity. Generally, good electrical conductors like metals are also good conductors of heat, while insulators like ceramic or plastic materials are also poor thermal conductors.


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