1-28-Capacitors BB - Capacitors Capacitor is a device that...

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Unformatted text preview: Capacitors Capacitor is a device that stores electric potential energy by storing separated positive and negative charges. Definition of Capacitance: SI unit: Coulomb/volt = farad (F). Microfarads 1 F=10-6 F Nanofarads 1 nF=10-9 F Picofarads 1pF=10-12 F V Q C = +Q V-Q Charge almost evenly spread on the inner surface. A uniform electric field exists between two plates. a parallel plate capacitor. Area A Separation d Charge Q = = A Q E Charge density, Charge per unit area Capacitance for a parallel plate capacitor d A C = Ed V = A Q E = d A Q V = The capacitance is only related to geometrical factors of the capacitor. V C Q = V Q C = V d A Q = AB B A Ed V V =- apply then (ch. 19) Ed V V =-- + V Example 20-5 All Charged Up A Q E = 2 028 . m A = V V 1 . 20 = Find Q. Sol (1): m V m V d V E / 10 65 . 3 10 55 . 1 . 20 4 3 = = =- C m m N C m V A E Q 9 2 2 2 12 4 10 06 . 9 ) 028 . ))( /( 10 85 . 8 )( / 10 65 . 3 (-- =...
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1-28-Capacitors BB - Capacitors Capacitor is a device that...

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