r why redraw bottom loop equation vab v v 0 vab

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Unformatted text preview: p Equation: Vab + V – V = 0 Vab = 0 2R a 2V V I1 I2 b V d I3 c Physics 212 Lecture 10, Slide 17 17 a b BB V R R Is there a current flowing between a and b ? Is and A) Yes B) No A & B have the same potential Current flows from battery and splits at A No current flows between A & B Some current flows down Some current flows right Physics 212 Lecture 10, Slide 18 18 Preflight 5 I1 I2 BB I I4 I3 60 50 I1R – I2 (2R) = 0 I2 = ½ I1 40 30 I4R – I3 (2R) = 0 I4 = 2 I3 20 10 0 I = I1 - I3 I + I2 = I4 I1 - I3 + ½ I1 = 2I3 I1 = 2I3 I = +I3 Physics 212 Lecture 10, Slide 19 19 Prelecture What is the same? What Preflight Current flowing in and out of the battery Current 2R 3 2R 3 What is different? Current flowing from a to b Physics 212 Lecture 10, Slide 20 20 I 2/ R 3I 1/ 3I a V 2/ 2/ I 3 3I b R 1/ 3I V/2 2R 1/ 1/ 0I 3 2 1/ I 3 2R 1/ 3I 2/ 3I 3I Physics 212 Lecture 10, Slide 21 21 Preflight 7 IA IB c c BB 50 Current will flow from left to right in both cases 40 30 In both cases, Vac = V/2 In V/2 20 10 I2R = 2I4R IA = IR – I2R = IR – 2I4R 0 IB = IR – I4R Physics 212 Lecture 10, Slide 22 22 Model for Real Battery: Internal Resistance + r V0 r R VL V0 R VL Usually can’t supply too much current to the supply load without voltage “sagging” Physics 212 Lecture 10, Slide 23 23...
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