1. AVE = 81

2. Review: the resistor HW4 up – due monday

3. V decreases in the direction of (conventional) current flow Review: the resistor

4. Batteries! The perfect battery

5. Batteries! A Perfect battery: loaded Still !

6. Batteries! A real battery

7. Batteries! A real battery: loaded

8. Terminal voltage Current drawn from battery

9. Equivalent circuit for a real battery Real battery Equivalent circuit

10. How’s it work?

12. Terminal voltage Current drawn

13. Example: Lets measure E and r ! VDC 12.2 V

14. Example: Lets measure E and r ! ADC 10.6 A !

15. What’s battery’s internal resistance?

16. Equivalent resistance

18. ?

19. Series resistors Not Yet!

20. Series resistors now

21. Series resistors

22. Example: what’s the equivalent resistance?

23. Parallel resistors Not Yet!

24. Parallel resistors What to do? Not Yet!

25. Parallel resistors now

26. Parallel resistors

27. Example: what’s the equivalent resistance?

28. Now try this!!! Apply our rules in steps ….

29. Now try this!!! Series resistors!

30. Now try this!!!

31. Parallel resistors!

32. Now try this!!!

33. Series resistors!

34. Now try this!!!

35. 12V 100  200  EXAMPLE: What’s the voltage across, and the current thru each resistor? Not Yet!

36. 12V 100  200  EXAMPLE: What’s the voltage across, and the current thru each resistor?

37. 12V 100  200 

38. EXAMPLE: What’s the voltage across, and the current thru each resistor?