Lec11-2 - Lecture 11-1 READING QUIZ 1 The terminal voltage...

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Lecture 11-1 READING QUIZ 1 The terminal voltage of a battery is V t = 10.5 volts when a current of 180 amperes is supplied by the battery The electromotive force (Emf) of this car battery is 13.5 volts. What is the internal resistance r (ohms Ω) of the battery? A) r = 3.30 Ω B) r = 1.12 Ω C) r = 0.017 Ω D) r = 0.47 Ω
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Lecture 11-2 Ideal vs Real Battery Energy conservation Work done by battery is equal to energy dissipated in resistor 22 dW i Rdt or idt i Rd iR t ε = = = Ideal battery: no internal energy dissipation EMF ε = terminal voltage V Real battery: internal energy dissipation exists dW > i 2 Rdt or ε > iR=V
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Lecture 11-3 Resistors in Series 12 () eq R RR ∴= + The current through devices in series is always the same. R 1 R 2 i i ε 0 iR iR ε −− = R eq i ε 0 eq iR −= 123 ... eq R R =+++ For multiple resistors in series:
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Lecture 11-4 Real Battery = Resistors in Series eq R rR ∴= + The current through devices in series is always the same. 0 ir iR ε −− = R eq i ε 0 eq iR −= , i Rr + internal resistance 123 ... eq R RR R =+++ For multiple resistors in series: terminal voltage ba V V ir R = +
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Lecture 11-5 Resistors in Parallel 11 2 2 3 3 iR ε= = ( ) 123 eq i i ε = ++ 1 111 eq eq or RR R R R R εεε ++= =++ Devices in parallel has the same potential drop ••• L R A ρ = Generally, i eq i =
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Lecture 11-6 DOCCAM 2 DEMO 5B-04 SUM OF VOLTAGE DROPS EQUALS EMF
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Lecture 11-7 Kirchhoff’s Rules Kirchhoff’s Rule 1: Loop Rule When any closed loop is traversed completely in a circuit, the algebraic sum of the changes in potential is equal to zero. 0
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Lec11-2 - Lecture 11-1 READING QUIZ 1 The terminal voltage...

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