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02 · SFO foundations · Physique · 02.13A · Cours 13 — Électrostatique III et électrocinétique I · all pages
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02.13A · Cours 13 — Électrostatique III et électrocinétique I

Course 13 — Electrostatics III and electrokinetics I

1. Physique · 35 pages

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1Dipole recap2Capacitance recap
Energy stored in a capacitor
3Gravitational analogy4Three equivalent formulas
5Electrostatics III
Electric field flux
6Vector field flux — water analogy7Electric flux definition8Flux through sphere around a charge9Fluid flux on closed surface — zero net flow10Zero flux from external charge
Gauss's theorem
11Statement of Gauss's theorem12Long wire — symmetry argument13Long wire — Gaussian cylinder setup14Long wire — E = λ/(2πε₀R)15Infinite plane — E = σ/(2ε₀)
16Electrokinetics I
Electric current
17Definition of average current18Instantaneous current and ampere19Conventional current direction
Drift velocity
20Zigzag path and drift velocity concept21Current formula I = qnAv_d
Resistance and voltage drop
22Resistance introduction23Voltage drop ΔV = −Ed24Hydraulic analogy — pump vs battery
Ohm's law
25Current proportional to voltage26V = RI formula27Body safety voltage — question28Body safety voltage — solution
Resistance and resistivity
29Geometric dependence R ∝ L/A30Resistivity table and R = ρL/A31Temperature dependence ρ(T) = ρ₀(1+α₀ΔT)32Platinum thermometer example
Electrical power — Joule effect
33Joule effect introduction34Joule heating derivation P = IV
35Next exercise session