13f_capacitors

13f_capacitors - Lesson 13f: Capacitors Capacitors are...

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Lesson 13f: Capacitors Capacitors are simple devices found in electric circuits. At their simplest, they are made up of two metal parallel plates separated by a non-conductor called the dielectric medium . Note, sometimes the dielectric medium is simply a vacuum. These capacitors are called parallel-plate capacitors . When a voltage is applied across the capacitor, it builds up charge on the two plates (one positive, the other negative), in effect storing electricity. Capacitors can be used to store up charge so that it can be released in a quick burst on demand. This is what a camera flash does when it charges up before you take a picture. Capacitors can also be used to block DC current, while allowing AC current to go through. They are also used to “smooth” out electricity, like on some high end power bars used for sensitive electronics. The amount of charge that can be stored in a capacitor depends on several factors, but is often stated as a single variable, the
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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13f_capacitors - Lesson 13f: Capacitors Capacitors are...

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