Current and Resistance


Semiconductors Semiconducting devices are at the heart of the microelectronic revolution that ushered in the information age. Table 27-2 compares the properties of silicon-a typical semiconductor-and copper-a typical metallic conductor. We see that silicon has many fewer charge carriers, a much higher resistivity, and a temperature coefficient of resistivity that is both large and negative. Thus, although the resistivity …

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Ohm’s Law

Ohm’s Law As we just discussed in Section 27·4, a resistor is a conductor with a specified  resistance. It has that same resistance no matter what the magnitude and direction(polarity) of the applied potential difference. Other conducting devices, however, might have resistances that change with the applied potential difference.  shows how to distinguish such devices. A potential …

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