Lecture12_Kim

Lecture12_Kim - 1 Lecture 12-1 1 ANNOUNCEMENT NOTE THAT FEW...

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Unformatted text preview: 2/17/2012 1 Lecture 12-1 2/17/2012 1 ANNOUNCEMENT NOTE THAT FEW EQUATIONS WILL BE GIVEN – YOU ARE REMINDED THAT IT IS YOUR RESPONSIBILITY TO CREATE WHATEVER TWO-SIDED CRIB SHEET YOU WANT TO BRING TO THIS EXAM. *Exam 1 : Monday February 20, 2012, 8 PM - 10 PM * Location: Elliot Hall of Music *Covers all readings, lectures, homework from Chapters 21 through 24. *The exam will be multiple choice (15-17 questions). Be sure to bring your student ID card and your own one-page (two-side) crib sheet. The equation sheet that will be given with the exam is posted on the course homepage. Click on the link on the left labeled “EquationSheet” Lecture 12-2 Lecture 12-3 Lecture 12-4 2/17/2012 2 Lecture 12-5 Chapter 25 Electric Current and Direct-Current Circuits 25-6 RC Circuits Chapter 26 The Magnetic Field 26-1 The Force Exerted by a Magnetic Field Lecture 12-6 ε Capacitor in RC Circuits / t RC Q Q e- = I charging I discharging h Switch closed at t=0. C initially uncharged, thus V = 0 across C and I = ε /R initially. h Switch closed at t=0. C initially charged, thus V 0 = Q /C across C and I = V /R initially. h After a long time, C is fully charged and V ∞ = ε across C and I ∞ = 0 . h After a long time, C is fully discharged and V ∞ = 0 across C and I ∞ = 0 . RC is a time constant Lecture 12-7 Behavior of Capacitors • Charging – Initially, the capacitor behaves like a wire . – After a long time, the capacitor behaves like an open switch . • Discharging – Initially, the capacitor behaves like a battery . – After a long time, the capacitor behaves like an open switch Lecture 12-8 Discharging a Capacitor in RC Circuits 2. Loop Rule: 3. Convert to a differential equation 4. Solve it! ( 29 / / t RC t RC Q Q e dQ Q I e dt RC-- = = - = 1. Switch closed at t=0. Initially C is fully charged with Q Q IR C- = I dQ I dt = - Q dQ R C dt + = 2/17/2012 3 Lecture 12-9 Charge Q(t) during Discharging [ ] [ ] / / ( ) ( ) t RC t Q t Q e Q t Q C...
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Lecture12_Kim - 1 Lecture 12-1 1 ANNOUNCEMENT NOTE THAT FEW...

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