lecture_10_F2011

lecture_10_F2011 - Page 4 Combine Resistance and Battery...

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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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Lecture 10 Chapters 24 and 25
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Unformatted text preview: Page 4 Combine Resistance and Battery Voltage in circuit Resistance in Series Lecture 10 Chapters 24 and 25 Page 5 Resistors in parallel Problem What is the resistance of a 1.0-m long Cu wire that is 0.5 mm in diameter? m 10 68 1 8 Cu Ω × =-. ρ Text Problem 24 – 17 The National Electrical Code specifies a maximum current of 10 A in 16-gauge (1.29-mm-diameter) Cu wire. What is the corresponding current density? Text Problem 24 – 36 With a typical resistance of 100 k , how much current could a 12–V car battery pass through an individual if connected correctly? Is this a safe current? Lecture 10 Chapters 24 and 25 Page 6 Text Problem 24 – 45 Silver and iron wires of the same length and diameter carry the same current. How do the voltages across the two compare? Lecture 10 Chapters 24 and 25 Page 7 Equivalent resistance Circuit Revised Final Rank R eq in order of decreasing resistance: Lecture 10 Chapters 24 and 25 Page 8 How do you take a ‘measurement’ for voltage and current across a resistor....
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This note was uploaded on 01/10/2012 for the course PHYS 2114 taught by Professor Bandy during the Spring '08 term at Oklahoma State.

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lecture_10_F2011 - Page 4 Combine Resistance and Battery...

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