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Lecture_14-Part_2

Lecture_14-Part_2 - Chapter 18 A Microscopic View of...

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Chapter 18 A Microscopic View of Electric Circuits
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Steady state and static equilibrium Static equilibrium : no charges are moving Steady state : • charges are moving • their velocities at any location do not change with time • no change in the deposits of excess charge anywhere Current in a Circuit In an electric circuit the system does not reach equilibrium! A microscopic view of electric circuits: Are charges used up in a circuit? How is it possible to create and maintain a nonzero electric field inside a wire? What is the role of the battery in a circuit?
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What would be I A compared to I B ? 1) I B = 0 all electrons are used up in the bulb 2) I B < I A some of the electrons are used up in the bulb 3) I B = I A Current in Different Parts of a Circuit What happens to the charges that flow through the circuit? Is the current the same in all parts of a series circuit?
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1) I B = 0 all electrons are used up in the bulb a) electrons disappear in the light bulb requires nuclear reaction b)
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