db_lec06_post

db_lec06_post - Lecture 6 1 1 Previous Lecture = Q C=...

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1/29/12 1 Lecture 6 D. Bortoletto PHYS221 • This Lecture • Current • Resistivity as a property of materials • Emf • Previous Lecture • Capacitors • Capacitors in series • Capacitors in parallel • E stored in an E field Q C V = Δ 11 i series i CC = parallel i i = 2 0 22 cap elec PE Q V u E ε = Δ =
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1/29/12 2 ILQ1 What is the equivalent capacitance, C eq , of the combination? (A) C eq = (2/3) C (B) C eq = (3/2) C (C) C eq = 3 C o o C C C (D) C eq = 2 C D. Bortoletto PHYS221
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1/29/12 3 Electrostatics versus Electric Current D. Bortoletto PHYS221 • Conductors have free electrons moving at ~10 6 m/s. • Electrons bump into the fixed positive nuclei random paths. On average no net displacement of charge no current
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1/29/12 4 Electric Current Electrostatic Equilibrium Steady-State Convention: Current arrow is drawn in direction in which positive charge carriers would move, even if the actual charges are negative & move in the opposite direction. Battery + - D. Bortoletto PHYS221 Current is defined as the rate of flow of charge through an area. s C 1 A 1 (A). ampere the is for unit SI = Δ Δ = I t Q I
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1/29/12 5 Electric Current Notice that flow of positive charge in one direction, + + + + + + + + + + CURRENT I Becomes more positive Becomes more negative • Equivalent to negative charge in opposite direction.
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db_lec06_post - Lecture 6 1 1 Previous Lecture = Q C=...

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