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. 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? Example Problems Slide 23-24

14. 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? Example Problem Slide 23-25

15. Find the current in and the potential difference across each of the resistors in the following circuit. Example Problem 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: A.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. B.Which of the following circuits will provide more power? Slide 23-28

17. Electrical Safety

18. Analyzing Complex Circuits Slide 23-29

19. WORKBOOKS 23.1-4 QUESTIONS 1-4, 7,10,11,16,17

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

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

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

23. Capacitor Combinations Slide 23-30

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

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

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

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

28. RC Circuits Slide 23-35

29. 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? Checking Understanding 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. Electricity in the Nervous System Slide 23-40 The action potential Depolarization Repolarization Reestablishing resting potential

32. Saltatory Conduction Slide 23-41

33. WORKBOOKS 23.5-7 QUESTIONS 20, 23, 27

34. Summary Slide 23-43

35. Summary Slide 23-44