zhang16-2 - 1/21/2010 Capacitor: - For storing electric...

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1/21/2010 1 Capacitor: - For storing electric energy; Electrical signal filter, etc - Used in electric circuits Simplest capacitor: Parallel Plate Capacitor - Consists of two parallel plates - Each have area A; separated by a distance d - The plates carry equal and opposite charges Q Q When charged, the two plates will have potential difference D V - What is the relationship between Q and D V? The capacitance , C - Measures how well a capacitor can store energy V Q C D Q Q Units: Farad (F) 1 F = 1 C / Volt A Farad is very large Often will see μF or pF V D
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1/21/2010 2 Capacitance of a parallel-plate capacitor: d A C o d 2 2 12 0 N.m / C 10 85 . 8 (Permittivity of free space) A area A circuit is a collection of objects usually containing a source of electrical energy (such as a battery) connected to elements that convert electrical energy to other forms A circuit diagram can be used to show the components and paths of the real circuit
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zhang16-2 - 1/21/2010 Capacitor: - For storing electric...

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