phy16-2 - • Same Charge Q 1 = Q 2 = Q eq • Share...

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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 charge Q Capacitance C measures how much charge Q a capacitor can store for a given V 16.6&7 Capacitance & parallel plate capacitor
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16.8 Circuits and Circuit diagrams = combinations of capacitors, wires, batteries, resistors, …. Things in series Things in parallel Some electrical thing, light bulb, capacitors, TVs, … V 1 + V 2 = V battery V 1 = V 2 = V battery 16.8 Circuits and Circuit diagrams = combinations of capacitors, wires, batteries, resistors, ….
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Capacitors in Parallel Both ends connected together by wire C 1 C 2 C eq 15 V 10 V 15 V 10 V 15 V 10 V Share Charge: Q eq = Q 1 +Q 2 Add Areas: C eq = C 1 +C 2 = V eq • Same voltage: V 1 = V 2 Capacitors in Series Connected end-to-end with NO other exits
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Unformatted text preview: • Same Charge: Q 1 = Q 2 = Q eq • Share Voltage: V 1 +V 2 =V eq 1 1 C Q V C eq C 1 C 2 + + + + + + + + + + + +-+ + +-+ +-+Q-Q +Q-Q +Q-Q 2 1 2 1 1 1 C C Q C Q C Q C Q V eq total 2 2 C Q V 2 1 1 1 1 C C C eq Energy Stored in a Capacitor • Energy stored = ½ Q ΔV • From the definition of capacitance, this can be rewritten in different forms • Why is there a factor 1/2 ? • Isn’t it that • Simple answer: When charging a capacitor, the potential does not remain the same –it increases from zero to Application • Defibrillators – When fibrillation occurs, the heart produces a rapid, irregular pattern of beats – A fast discharge of electrical energy through the heart can return the organ to its normal beat pattern • In general, capacitors act as energy reservoirs that can be slowly charged and then discharged quickly to provide large amounts of energy in a short pulse...
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This note was uploaded on 03/15/2010 for the course PHY 102 taught by Professor Luo during the Spring '08 term at SUNY Buffalo.

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phy16-2 - • Same Charge Q 1 = Q 2 = Q eq • Share...

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