27 CHAPTER OUTLINE 27.1 Electric Current 27.2 Resistance 27.3 A Model for Electrical Conduction 27.4 Resistance and Temperature 27.5 Superconductors 27.6 Electric Power Current and Resistance ANSWERS TO QUESTIONS Q27.1 Individual vehicles—cars, trucks and motorcycles—would correspond to charge. The number of vehicles that pass a certain point in a given time would correspond to the current. Q27.2 Voltage is a measure of potential difference, not of current. “Surge” implies a flow—and only charge, in coulombs, can flow through a system. It would also be correct to say that the victim carried a certain current, in amperes. Q27.3 Geometry and resistivity. In turn, the resistivity of the material depends on the temperature. Q27.4 Resistance is a physical property of the conductor based on the material of which it is made and its size and shape, including the locations where current is put in and taken out. Resistivity is a physical property only of the material of which the resistor
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