lect10_handout - Physics 202 Lecture 10 Todays Topics...

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1 Physics 202, Lecture 10 Today’s Topics ± Direct Current Circuits (Ch. 28) ± Basic circuit components( ε , R, …) ± Kirchhoff’s Rules ± Circuits Analysis (For circuits of R’s and ε ’s) ± Preview Requirements: emf, junction rule, loop rule, …. ² Next Tuesday: RC circuit (ch. 28.4), Magnetic Field(ch. 29.1-3) Exam 1 Result 40 50 60 ncy Phy202 Exam1 Scores Median: 69 A: [83-97] AB,B: [69-82] BC,C: [45-68] D: [<45] 0 10 20 30 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 Frequen Bin Note: Letter boundaries are for reference only. ( Based on nominal A=15%, B=50% etc. and subject to final curve at the end of semester) Basic Circuit Components Component Symbol Behavior in circuit Ideal battery, emf Δ V=V + -V - = ε Resistor Δ V= - I R Realistic Battery Æ (Ideal) wire Δ V=0 ( Æ R=0, L=0, C=0) r ε Capacitor Δ V=V - -V + = - q/C, dq/dt = I Inductor Δ V= - Ld I /dt (Ideal) Switch L=0, C=0, R=0 (on), R= (off) Transformer Future Topics Diodes, Transistors,… Simple Circuit 1: Resistors In Series I 1 I 2 I ³ Exercise: show R eq =R 1 + R 2 . ´ I 1 = I 2 = I ´ Δ V =V R1 +V R2 = IR 1 +IR 2 Æ Δ V =I(R 1 +R 2 ) i R R +R R 1 R 2 R 1 +R 2 i.e. R eq =R 1 +R 2 ³ In general: R eq =R 1 + R 2 + R 3 + ….
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2 Simple Circuit 2: Resistors In Parallel ± Show 1/R eq =1/R 1 + 1/R 2 .
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This note was uploaded on 04/25/2009 for the course PHYS 202 taught by Professor Everett during the Spring '08 term at University of Wisconsin.

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lect10_handout - Physics 202 Lecture 10 Todays Topics...

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