lecture_10_F2011 - Chapters24and25 Lecture 10 Materials...

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Lecture 10 Chapters 24 and 25 Page 1 Materials: matter (sometimes in liquid form and Plasmas) I. For conductors: Without ext E : With ext E II Ionic (liquid form): III Plasmas: IV Semiconductors:
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Lecture 10 Chapters 24 and 25 Page 2 Text Example 23.4 Typical electric fields in thunderstorms average around 10 5 V/m . Consider a cylindrical thundercloud with height 10 km and diameter 20 km , and assume a typical but uniform electric field. a. Calculate the electric energy contained in this storm. b. Given that the energy content of gasoline is about 36 kWh/gal ( 1 kWh = 6 10 6 3 × . J), what is the equivalent amount of gasoline? Comment: This is not much for such a large volume. The energy density a storm fields can not compare with the macroscopic electric energy density locked into the molecular structure of a fuel. “You’ll never see cars running on the energy stored in atmospheric electric fields!”
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Lecture 10 Chapters 24 and 25 Page 3 Resistance (Ohm’s Law) and Electrical Power Ohm’s Law Power Circuit Symbols: Combine Resistance and Battery Voltage in circuit
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