Lecture14

Lecture14 - Lecture 14 Chapter 19 Electric Fields Circuits...

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1 Lecture 14 Chapter 19. Electric Fields & Circuits Steady state and static equilibrium Static equilibrium : Steady state : Current in a Circuit 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? 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? What would be I A compared to I B ? What is used up in the light bulb? We cannot get something for nothing! Energy is transformed from one form to another Current in Different Parts of a Circuit
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2 i 1 = i 2 i 2 = i 3 + i 4 Current at a Node Current Node Rule or Junction Rule or “Kirchhoff’s Current Law” Average ‘drift’ speed: e m t eE v Δ = t Δ - average time between collisions E v ~ For constant temperature
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Lecture14 - Lecture 14 Chapter 19 Electric Fields Circuits...

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