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# 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
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
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
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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