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2049_ch25A - Chapter 25 Capacitance Capacitors Capacitors...

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PHY2049: Chapter 25 1 Chapter 25: Capacitance Capacitors Capacitors on a computer motherboard
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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
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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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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 (C: coulomb, not capacitance) Note: ε 0 = 8.854x10 -12 C 2 /N m 2 = (same value) F/m Definitions and Units CV q =
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