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27.1 Electric Current 27.2 Resistance 27.3 A Model for Electrical Conduction 27.4 Resistance and Temperature 27.5 Superconductors 27.6 Electrical Power - Raymond – Currents and Ressistance

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Figure 27.2 A section of a uniformwhere direction in a time interval be the time interval during whichthe charges are displaced, onthe average, by the length of thecylinder, the number of carriers inthe section of length The mobile charge carriers movewith
Figure 27.5 A uniform conductor of length � and cross-sectional area A. A potentialdifference �V � Vb � Va maintained across the conductor sets up an electric field E,and this field produces a current I that is proportional to the potential difference.
Table 27.1
Figure 27.7 (a) The current–potential difference curve for an ohmic material. Thecurve is linear, and the slope is equal to the inverse of the resistance of the conductor.(b) A nonlinear current–potential difference curve for a junction diode
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