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lecture_09_F2011 - Lecture 9 Page 1 Current Current is...

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Lecture 9 Chapters 20-23 and some 24 Page 1 Current Current is directed by convention in the direction that positive charge flows. For electron e - flow in metals, for example,  is opposite the “conventional” positive charge motion. When both +e and –e charges are in motion with velocity v, we look for I net Conductor Without ext E : Conductor with ext E :
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Lecture 9 Chapters 20-23 and some 24 Page 2 Materials: matter (sometimes in liquid form and Plasmas) I. For conductors: Without ext E : With ext E
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Lecture 9 Chapters 20-23 and some 24 Page 3 Resistance (Ohm’s Law) and Electrical Power II Ionic (liquid form): III Plasmas: IV Semiconductors: OHM’S LAW:
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Lecture 9 Chapters 20-23 and some 24 Page 4 Power Circuit Symbols: Combine Resistance and Battery Voltage in circuit
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Lecture 9 Chapters 20-23 and some 24 Page 5 Example Text 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.
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