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DAY 28

DAY 28. DC circuits. Slide 23-3. Slide 23-4. Slide 23-5. Drawing Circuit Diagrams. Slide 23-12. Checking Understanding. The following circuit has a battery, two capacitors and a resistor. Which of the following circuit diagrams is the best representation of the above circuit?.

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DAY 28

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  1. DAY 28 DC circuits

  2. Slide 23-3

  3. Slide 23-4

  4. Slide 23-5

  5. Drawing Circuit Diagrams Slide 23-12

  6. Checking Understanding The following circuit has a battery, two capacitors and a resistor. Which of the following circuit diagrams is the best representation of the above circuit? Slide 23-13

  7. Answer The following circuit has a battery, two capacitors and a resistor. Which of the following circuit diagrams is the best representation of the above circuit? A Slide 23-14

  8. Kirchhoff’s Junction Law Slide 23-15

  9. Kirchhoff’s Loop Law Slide 23-16

  10. Using Kirchhoff’s Laws Slide 23-17

  11. Series Resistors Slide 23-22

  12. Parallel Resistors Slide 23-23

  13. Example Problems There is a current of 1.0 A in the circuit below. What is the resistance of the unknown circuit element? What is the current out of the battery? Slide 23-24

  14. Example Problem What is the current supplied by the battery in the following circuit? What is the potential at each node? What is the current in each branch? Slide 23-25

  15. Example Problem Find the current in and the potential difference across each of the resistors in the following circuit. Slide 23-26

  16. Example Problem • As we saw in the previous chapter, a resistor connected to a power supply works as a heater. Suppose an investigator is using a resistor (a length of nichrome wire in an insulating sheath) connected to a battery to warm a solution in the laboratory. It’s a simple circuit: • What power does the resistor provide to warm the solution? The investigator then decides that this warming is happening too slowly. She has another resistor, but doesn’t have another battery. • Which of the following circuits will provide more power? Slide 23-28

  17. Electrical Safety

  18. Analyzing Complex Circuits Slide 23-29

  19. Workbooks 23.1-4questions 1-4, 7,10,11,16,17

  20. Capacitance and Capacitors The charge ±Q on each electrode is proportional to the potential difference ∆VC between the electrodes: Slide 21-36

  21. Charging a Capacitor It requires energy to charge a capacitor. This energy is stored as electrical potential energy Slide 21-37

  22. The Capacitance of a Parallel-Plate Capacitor Slide 21-38

  23. Capacitor Combinations Slide 23-30

  24. Checking Understanding Which of the following combinations of capacitors has the highest capacitance? Slide 23-31

  25. Answer Which of the following combinations of capacitors has the highest capacitance? B Slide 23-32

  26. Checking Understanding Which of the following combinations of capacitors has the lowest capacitance? Slide 23-33

  27. Answer Which of the following combinations of capacitors has the lowest capacitance? C Slide 23-34

  28. RC Circuits Slide 23-35

  29. Checking Understanding The following circuits contain capacitors that are charged to 5.0 V. All of the switches are closed at the same time. After 1 second has passed, which capacitor has the highest voltage? Slide 23-36

  30. Answer The following circuits contain capacitors that are charged to 5.0 V. All of the switches are closed at the same time. After 1 second has passed, which capacitor has the highest voltage? C Slide 23-37

  31. The action potential DepolarizationRepolarization Reestablishing resting potential Electricity in the Nervous System Slide 23-40

  32. Saltatory Conduction Slide 23-41

  33. Workbooks 23.5-7questions 20, 23, 27

  34. Summary Slide 23-43

  35. Summary Slide 23-44

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