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Capacitors, Capacitance, and Dielectrics

Capacitors, Capacitance, and Dielectrics - Physics 202...

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Physics 202 Thursday, February 18, 1999 Announcements: No recitation quiz next week Lab Quiz next week on the concepts covered in labs 3 and 4 Recitation quiz for February 26 or March 1 will cover chapter 25. Lecture notes: Capacitors, Capacitance, and Dielectrics A capacitor is a device to store charges ( and hence store electrical energy). Capacitance is a measure of how effective a capacitor is. Let's consider of simple circuit: o A battery is connected to a pair a parallel plates. o This can be shown as the following diagram: A battery is a device that through chemical reactions maintains a potential difference
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(V) between its positive and negative terminals. When the battery is connected to the pair of parallel conducting plates, ( some of the) electrons in the red plate are driven to the positive terminal and an equal amount of electrons are driven from the negative terminal to the black plate. o The set of parallel plates acts as a capacitor. The amount of charge the plate can hold is proportional to the potential applied ( by the battery) on the plate o
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