Unformatted text preview: r a closed surface, the flux is equal to the enclosed charge: Φ = Qenclosed/ε0. Definition of capacitance: C = Q/V A!
A!
Capacitance of a parallel plate capacitor: C=
= ! r 0 d
d
Table of dielectric strengths: Table of dielectric constants εr: 1
1
1 Q2
Ecap = C !V 2 = Q!V =
Energy stored in a capacitor: 2
2
2C
Current is defined as I = Q/Δt (number of charges injected per unit time, amperes) Resistance: R = V !d
(ohms) =
I
A Ohm’s Law: V = IR Table of resistivities: Circuit power: P = VI = I2R = V2/R (Watts) 10 Ωm insulators: ρ > 10
semiconductors: ρ ≈ 1 Ωm conductors: ρ ≈ 10
8 Ωm Resistors combine in series and parallel as: Series: Req = R1 + R2 + … Parallel: 1/Req = 1/R1 + 1/R2 + … Capacitors combine in series and parallel as: Series:...
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This document was uploaded on 03/26/2014.
 Spring '14

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