1 / 33

Chapter 12

Chapter 12. Thevenin, Norton and Maximum Power Transfer Theorems. Thevenin’s Theorem. Why Thevenin’s Theorem is useful. What is Thevenin’s Theorem?.

meryle
Download Presentation

Chapter 12

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 12 Thevenin, Norton and Maximum Power Transfer Theorems

  2. Thevenin’s Theorem • Why Thevenin’s Theorem is useful

  3. What is Thevenin’s Theorem? • Everything in the original circuit, except the load, maybe replaced by an equivalent circuit. The equivalent circuit consists of a series combination of a voltage source and a resistance.

  4. Steps to make a Thevenin Circuit Write these on white board

  5. Calculating RTHEVENIN (RTH) RTH = 5kΩ

  6. Calculating VTHEVENIN (VTH) VTH = 10V

  7. Equivalent Thevenin Circuit Now you can place any load in the circuit you want and the calculations are EASY! .66mA =10kΩ

  8. Using the Thevenin Theorem Determine VTH Solving for VTH 10V 5V VTH = VA – VB = 5V

  9. Using the Thevenin Theorem Determine RTH

  10. Solving for RTH What is the resistance from point a to b?

  11. B A Turning Figure 12.15C into Figure 12.15D 10kΩ 9kΩ 10kΩ 3kΩ

  12. Using the Thevenin Theorem

  13. Final Thevenin Circuit(with load)

  14. One more Thevenin Circuit Problem

  15. Random Video of the Day • http://www.youtube.com/watch?v=SWWt9IC7mGs&NR=1&feature=fvwp • https://www.facebook.com/photo.php?v=133641650156241

  16. Norton’s Theorem • Everything in the original circuit, except the load may be replaced by an equivalent circuit. The equivalent circuit consists of a parallel combination of a current source and a resistance.

  17. What a Norton Circuit Looks Like Norton Resistance Norton Current IN 2mA

  18. Norton Shortcut • There are a bunch of rules for how to calculate the Norton Current and Norton Resistance. However, a shortcut is to find the Thevenin Equivalent circuit and then convert it to a Norton

  19. Using Norton Shortcut 2mA

  20. Norton Example

  21. Other Circuit Analysis Techniques • Besides using traditional circuit analysis using Ohm’s Law, or Superposition, Mesh Analysis, Thevenin’s Theorem, and Norton’s Theorem, there are other circuit analysis techniques. A couple include: • Nodal Analysis and Millman’s Theorem Do more hw problems from back of chap 12 (9, 10, 11, or 12) if time

  22. Practice Problem • In the following circuit solve for VTH, RTH, IN, RN, IL and VL

  23. Another Practice Problem Solve for VL using traditional Ohm’s Law technique, Mesh Analysis, and Thevenin Analysis

  24. Maximum Power Transfer • See notes

  25. What load resistor would you use for the following circuit to have max power transferred?

  26. What load resistor would you use for the following circuit to have max power transferred? ? What circuit analysis technique can we use to solve for this? Thevenin’s Theorem. RTH = 5kΩ I’ve checked this technique using Ohm’s law and it works. See following numbers: 5mW @ 5kOhm 4.94mW @ 4kOhm 4.96mW @ 6kOhm

  27. What load resistor would you use for the following circuit to have max power transferred?

  28. A Couple Thoughts FromChapter 13

  29. Resistance Varies on Length, Diameter and Material

  30. Stranded Wire vs. Solid Wire

  31. Switches SPST SPDT DPST DPDT

More Related