Lec10-2 - Lecture 10-1 2008 by W.H. Freeman and Company...

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Lecture 10-1 ©2008 by W.H. Freeman and Company
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Lecture 10-2 Capacitor Examples 10 20 12 0 /2 /2 2 AA CC C dd A d κε ε κκ = += + +  =   2 C C C C /2 C C C C C ? C ?=2/3 0 0 0 1 1 1 /4 3 /4 1 31 44 C A A d A εκ = + = +
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Lecture 10-3 READING QUIZ 1 An electric toaster (resister) uses 2000 watts when the it is connected to a 100 volt potential difference. What is the resistance R (Ω) of the toaster? A| 10 Ω B| 5 Ω C| 15 Ω D| 20 Ω E| 12 Ω
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Lecture 10-4 DOCCAM 2 DEMO 5B-01 OHMS LAW BOARD
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Lecture 10-5 DOCCAM 2 DEMO 5B-O3 VOLTAGE PARADOX
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Lecture 10-6 Electric Current Current = charges in motion 0 lim x q dq I t dt ∆→ ≡= Magnitude rate at which net positive charges move across a cross sectional surface Units: [I] = C/s = A (ampere) Current is a scalar, signed quantity, whose sign corresponds to the direction of motion of net positive charges by convention J = current density (vector) in A/m² A I J dA = 
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Lecture 10-7 Microscopic View of Electric Current in Conductor All charges move with some velocity v e random motion with high speeds (O(10 6 )m/s) but with a drift in a certain direction on average if E is present Drift velocity v d is orders of magnitudes less than the actual velocity of charges. A Why random motion?
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Lec10-2 - Lecture 10-1 2008 by W.H. Freeman and Company...

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