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**Unformatted text preview: **Class 7 Capacitor Problems and Resistance Physics 106 Fall 2011 Press CTRL-L to view as a slide show. Learning Outcomes Last time we discussed: I Capacitance I Capacitors I Capacitors in series and parallel circuits I Dielectrics Learning Outcomes Today we will learn about I Capacitance Problems I Parallel-Plate Capacitors I Capacitors in Circuits I Current I Resistance I Ohm’s Law Problems with Capacitors in Circuits Problem-Solving Strategy I Combine capacitors in series I Combine capacitors in parallel I Continue until one capacitor remains I After finding Q and V , work back one step at a time Problem-Solving Strategy I In series: , chargethe reciprocals of capacitance add is the same, voltages add I In parallel: capacitance adds directly, voltage is the same, charges add Sample Problem I Find the charge on the 4 μ F capacitor. Sample Problem I Find the charge on the 4 μ F capacitor. Combine the two capacitors in parallel C 24 = C 2 + C 4 = 2 + 4 = 6 μ F Sample Problem I Find the charge on the 4 μ F capacitor. Combine the two capacitors in parallel C eq = C 2 + C 4 = 2 + 4 = 6 μ F Sample Problem I Find the charge on the 4 μ F capacitor. Combine the two capacitors in series 1 C eq = 1 C 3 + 1 C 6 = 1 3 + 1 6 = 1 2 C eq = 2 μ F Sample Problem I Find the charge on the 4 μ F capacitor. Combine the two capacitors in series 1 C eq = 1 C 3 + 1 C 6 = 1 3 + 1 6 = 1 2 = 2 μ F Sample Problem I Find the charge on the 4 μ F capacitor. The voltage on this capacitor is 12 V and the charge is Q = CV = 24 μ C. Sample Problem I Find the charge on the 4 μ F capacitor. We made this capacitor out of two capacitors in series....

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