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# ch31 - Chapter 31 Current and Resistance Lights sound...

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1 Chapter 31. Current and Resistance Lights, sound systems, microwave ovens, and computers are all connected by wires to a battery or an electrical outlet. How and why does electric current flow through a wire? Chapter Goal: To learn how and why charge moves through a conductor as what we call a current.

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2 Topics: The Electron Current Creating a Current Current and Current Density Conductivity and Resistivity Resistance and Ohm’s Law Chapter 31. Chapter 31. Current and Resistance Current and Resistance
3 Topics: The Electron Current Creating a Current Current and Current Density Conductivity and Resistivity Resistance and Ohm’s Law Chapter 31. Chapter 31. Current and Resistance Current and Resistance You are responsible for all of Chap 31

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5 What quantity is represented by the symbol J ? A. Resistivity B. Conductivity C. Current density D. Complex impedance E. Johnston’s constant

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6 A. Resistivity B. Conductivity C. Current density D. Complex impedance E. Johnston’s constant What quantity is represented by the symbol J ?
7 The electron drift speed in a typical current-carrying wire is A. extremely slow ( ! 10 –4 m/s). B. moderate ( ! 1 m/s). C. very fast ( ! 10 4 m/s). D. Could be any of A, B, or C. E. No numerical values were provided.

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8 A. extremely slow ( ! 10 –4 m/s). B. moderate ( ! 1 m/s). C. very fast ( ! 10 4 m/s). D. Could be any of A, B, or C. E. No numerical values were provided. The electron drift speed in a typical current-carrying wire is
9 All other things being equal, current will be larger in a wire that has a larger value of A. conductivity. B. resistivity. C. the coefficient of current. D. net charge. E. potential.

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10 All other things being equal, current will be larger in a wire that has a larger value of A. conductivity. B. resistivity. C. the coefficient of current. D. net charge. E. potential.
11 The equation I = ! V/R is called A. Ampère’s law. B. Ohm’s law. C. Faraday’s law. D. Weber’s law.

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12 The equation I = ! V/R is called A. Ampère’s law. B. Ohm’s law. C. Faraday’s law. D. Weber’s law.
13 Learning Objectives To use the charge and field models to develop a concrete model of current in a conductor To examine the evidence by which we know that the current in a metal is due to the motion of electrons To develop a micro/macro connection between the motion of charge carriers and the conventional macroscopic current To introduce conductivity and resistivity as important parameters describing the electrical properties of materials To introduce resistance and Ohm’s Law

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15 Last Class you saw Exploding wire Demo We charged a capacitor to a large potential difference.

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ch31 - Chapter 31 Current and Resistance Lights sound...

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