StudyGuideChapter26 - series G G" G œ"...

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Capacitors Study Guide for Chapter 26 Outline 1. Capacitor A capacitor is a device that stores charge. Usually, a capacitor stores an equal amount of positive and negative charge, held close together on two metal pates. The charge on the capacitor is proportional to the potential difference between the plates: U Z ? U œ G Z ? The constant is called the of the capacitor. Capacitance is measured in G capacitance farads (F), where F C V " œ " Î For a capacitor with two parallel plates, the capacitance is given by the formula G œ E . % ! where is the area of each plate, and is the distance separating the plates. E . Problems: 5, 11 2. Capacitors in Combination When two capacitors are connected in , the capacitance : parallel adds G " G # G œ G  G total " # When two capacitors are in , the addition works differently:
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Unformatted text preview: series G # G " G œ " total " " G G " # These rules can be combined to analyze more complicated arrangements of capacitors: G " G $ G # G & G % G œ " total " " " G G G G G " # $ % & Problems: 17, 19, 21 3. Dielectrics You do not need to learn the material in this section. 4. Energy in Capacitors The potential energy stored in a capacitor is given by the formula: Y œ U Z " # ? (This is just the formula for the potential energy of a charged conductor given in chapter 25.) Since , this formula can be written: U œ G Z ? Y œ G Z Y œ " U # #G a b ? # # or These are the only formulas we will be using from this section. You can ignore the material on dielectrics and energy density after example 10. Problems: 53, 55...
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StudyGuideChapter26 - series G G" G œ"...

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