Transcription of RC Circuits - UIUC
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RC Circuits - UIUC
Physics 102:Lecture 7RC CircuitsRC CircuitsPhysics 102: Lecture 7, Slide 1RC Circuits Circuits that have both resistorsandcapacitors:RKRNaRClC+++ K Na Cl Withresistancein the circuitscapacitorsdo notS With resistancein the Circuits , capacitorsdo not chargeand dischargeinstantaneously it takes time (even if only fractions of a second).Physics 102: Lecture 7, Slide 2(even if only fractions of a second).RC CiiRC CircuitsUsed to controllably store and release energyToday: RC Circuits Charging Capacitors Discharging Capacitors Intermediate Behavior Physics 102: Lecture 7, Slide 3 Charging CapacitorsStoring energy to use later Capacitor is initially uncharged and switch is open.
swihi Sihi h l ditch is open. Switch is then closed. C • What is current I 0 in circuit immediately R thereafter? S – Capacitor initially uncharged ε – Therefore V C =0 (since V=Q/C) – Therefore C behaves as a wire (short R circuit) – Ohm’s law! ε Physics 102: Lecture 7, Slide 5 I 0 = ε/R
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