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Unformatted text preview: cture 10 cture 10 1 ©2008 by W.H. Freeman and Company cture 10 cture 10 2 Capacitor Examples 1 2 1 2 1 2 / 2 / 2 2 A A C C C d d A d κ ε κ ε ε κ κ = + = + + = ÷ 2 C C C C /2 C C C C C ? C ?=2/3 1 2 0 0 1 1 1 / 4 3 / 4 1 3 1 4 4 d d C C C A A d A ε κ ε ε κ = + = + = + ÷ cture 10 cture 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 cture 10 cture 10 4 DOCCAM 2 DEMO 5B01 OHMS LAW BOARD cture 10 cture 10 5 DOCCAM 2 DEMO 5BO3 VOLTAGE PARADOX cture 10 cture 10 6 Electric Current Current = charges in motion 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 d A = ∫ ur ur g cture 10 cture 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....
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 Fall '08
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