lect07_handout - Physics 102: Lecture 7 RC Circuits Physics...

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Physics 102: Lecture 7, Slide 1 RC Circuits Physics 102: Lecture 7
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Physics 102: Lecture 7, Slide 2 Recall …. First we covered circuits with batteries and capacitors series, parallel Then we covered circuits with batteries and resistors series, parallel Kirchhoff’s Loop and Junction Relations Today: circuits with batteries, resistors, and capacitors
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Physics 102: Lecture 7, Slide 3 RC Circuits • RC Circuits • Charging Capacitors • Discharging Capacitors • Intermediate Behavior
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Physics 102: Lecture 7, Slide 4 RC Circuits • Circuits that have both resistors and capacitors : • With resistance in the circuits, capacitors do not charge and discharge instantaneously – it takes time (even if only fractions of a second). R K C S + + + R Na R Cl ε K ε Na ε Cl
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Physics 102: Lecture 7, Slide 5 Capacitors Charge (and therefore voltage) on Capacitors cannot change instantly: remember V C = Q/C Short term behavior of Capacitor: – If the capacitor starts with no charge, it has no potential difference across it and acts as a wire – If the capacitor starts with charge, it has a potential difference across it and acts as a battery. Long term behavior of Capacitor: Current through a Capacitor eventually goes to zero. – If the capacitor is charging, when fully charged no current flows and capacitor acts as an open circuit – If capacitor is discharging, potential difference goes to zero and no current flows
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Physics 102: Lecture 7, Slide 6 Charging Capacitors • Capacitor is initially uncharged and switch is open. Switch is then closed. What is current I 0 in circuit immediately thereafter? • What is current I in circuit a long time later? ε R C S
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Physics 102: Lecture 7, Slide 7 Charging Capacitors: t=0 • Capacitor is initially uncharged and switch is open. Switch is then closed.
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This note was uploaded on 02/04/2012 for the course PHYSICS 102 taught by Professor Demarco during the Spring '11 term at University of Illinois at Urbana–Champaign.

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lect07_handout - Physics 102: Lecture 7 RC Circuits Physics...

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