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PHY2049: Chapter 25
1
Chapter 25: Capacitance
Capacitors
Capacitors on a computer
motherboard
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View Full Document PHY2049: Chapter 25
2
Î
Coulom’s law and Gauss’ law
E field
Force F
Potential V
Energy U
Î
Applications: Capacitance (Ch. 25)
Electric circuits (Ch. 26)
Review and Overview
(differentiate)
(differentiate)
(integrate)
(integrate)
 F=qE 
 U=qV 
Coulomb’s
law
Gauss’
law
(equivalent)
Current I=dq/dt
PHY2049: Chapter 25
3
Subjects
Î
Capacitance: definition and units
Î
Capacitance: calculation
Î
Capacitors in parallel and series
Î
Energy stored in electric field
Î
Dielectrics (insulators)
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View Full Document PHY2049: Chapter 25
4
Î
Capacitor
±
Two conductors, electrically isolated from each other
±
Particularly when the pair is used as device in electronic circuit to
store charge and for other purposes
Î
Capacitance
±
C is a constant that characterizes given pair of conductors in given
configuration
±
For given (applied) V, larger capacitor stores more q
±
For given q, smaller V appears in larger capacitor
Î
Units
F (farad)
1 F = 1 C/V
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This note was uploaded on 04/12/2008 for the course PHY 2049 taught by Professor Any during the Fall '08 term at University of Florida.
 Fall '08
 Any
 Capacitance, Gauss' Law, Force

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