Lec11-2

# Lec11-2 - ture 11-1 ture READING QUIZ 1 The terminal...

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cture 11- cture 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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cture 11- cture 11- 2 Ideal vs Real Battery Energy conservation Work done by battery is equal to energy dissipated in resistor 2 2 dW i Rdt or i dt i R d 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
cture 11- cture 11- 3 Resistors in Series 1 2 ( ) eq R R R ∴ = + The current through devices in series is always the same. R 1 R 2 i i ε 1 2 0 iR iR ε- - = R eq i ε 0 eq iR = 1 2 3 ... eq R R R R = + + + For multiple resistors in series:

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cture 11- cture 11- 4 Real Battery = Resistors in Series eq R r R ∴ = + The current through devices in series is always the same. 0 ir iR ε- - = R eq i ε 0 eq iR = , i R r ε = + internal resistance 1 2 3 ... eq R R R R = + + + For multiple resistors in series: terminal voltage b a V V ir R R r - = - = +
cture 11- cture 11- 5 Resistors in Parallel 1 1 2 2 3 3 i R i R i R ε= = = ( 29 1 2 3 eq i i i R + + 1 2 3 1 2 3 1 1 1 1 eq eq or R R R R R R R R ε + + = = + + Devices in parallel has the same potential drop ••• L R A ρ = Generally, 1 1 i eq i R R =

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cture 11- cture 11- 6 DOCCAM 2 DEMO 5B-04 SUM OF VOLTAGE DROPS EQUALS EMF
cture 11- cture 11-

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Lec11-2 - ture 11-1 ture READING QUIZ 1 The terminal...

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