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Chapter 2

Chapter 2. Resistive Circuits. Concept Test. For resistors in series , what is the same for every resistor? R, V or I? Answer: I For resistors in parallel, what is the same for every resistor? R, V or I? Answer: V. Resistors in Series. Resistors in Parallel. Voltage-divider rule

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Chapter 2

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  1. Chapter 2 Resistive Circuits

  2. Concept Test • For resistors in series, what is the same for every resistor? R, V or I? • Answer: I • For resistors in parallel, what is the same for every resistor? R, V or I? • Answer: V

  3. Resistors in Series Resistors in Parallel

  4. Voltage-divider rule • “The voltage across any resistor in a series is some fraction of the battery voltage.”

  5. In-Class Team Exercise • Wheatstone Bridge • Series and Parallel Circuits

  6. In-Class Problems • P2.1(b) • P2.3 • P2.7 • P2.13 • P2.18 • P2.21 • P2.29 • P2.25

  7. Series DC Networks • Two elements are in series if they have only one terminal in common that is not connected to a third current carrying component. • Total Resistance Current through a Series

  8. Consider Figure 2.29. • E=24V, R1=2W, R2=4W, R3=6W • What is RT? • What is I? • What is V1, V2 and V3? • What is P1, P2, P3, and PE?

  9. Express these numbers with only three significant figures and in the most convenient form. • 0.038457 C • 0.0012878 A • 12869.578 V • 0.57382 W

  10. 2.7 Parallel DC Networks • Two elements are in parallel if they have two terminals in common. • Total Resistance Source Current

  11. Example Problem 2.28 • Using Kirchhoff’s current law, determine the currents I3 and I6 for the system of Figure 2.38

  12. Consider Figure 2.32. • E1=100V • E2=50V • E3=20V • R1=10W • R2=30W • R3=40W • What is I? • What is V2?

  13. Example Problem 2.25 • Find V1 and V2 of Figure 2.33 using Kirchhoff’s voltage law.

  14. Current-divider rule • “The current through any resistor in parallel with other resistors is some fraction of the source current.”

  15. Example Problem 2.26 • Determine the following for the parallel network in Fig. 2.36. • (a) RT • (b) I • (c) I2 • (d) P3

  16. 2.8 Series-Parallel Networks Example Problem 2.29 • Determine the following for the network in Fig. 2.41. • (a) RT • (b) I • (c) I1 and I2 • (d) V1

  17. Voltage (page 13) • The term ground refers to a zero voltage or earth potential. • Ground Circuit Symbols

  18. How Batteries Work • Battery Parts: Two different metals separated by an electrolyte • History: The first battery was created by Alessandro Volta in 1800. • He used zinc, silver and salt water to make a voltaic pile.

  19. Appendix B: Resistor Color Codes -2 Silver -1 Gold 0 Black 1 Brown 2 Red 3 Orange 4 Yellow 5 Green 6 Blue 7 Violet 8 Gray 9 White Tolerance 5% Gold 10% Silver 20% No 4th band Memorize this table.

  20. Announcements • Lab Starts Today • Teams will sit together in lab

  21. Potentiometers • They are three terminal devices with a knob. • The knob moves a slider which changes the resistance between the terminals. • Circuit Symbols:

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