1. Maximum Power Transfer
Maximize the power delivered to a resistive load
ECE 201 Circuit Theory I

2. Consider the General Case
A resistive network contains independent and dependent sources.
A load is connected to a pair of terminals labeled a – b.
What value of load resistance permits maximum power delivery to the load?
ECE 201 Circuit Theory I

3. General Case (continued)
ECE 201 Circuit Theory I

4. Take the Thevenin equivalent of the circuit
ECE 201 Circuit Theory I

5. Look at the power developed in the load
ECE 201 Circuit Theory I

6. Find the value of Rload that maximizes power
ECE 201 Circuit Theory I

7. The maximum power delivered to the load
ECE 201 Circuit Theory I

8. Example 4.12 a) Find the value of RL for maximum power transfer to RL.
ECE 201 Circuit Theory I

9. Determine the Thevenin Equivalent
ECE 201 Circuit Theory I

10. ECE 201 Circuit Theory I

11. Example 4.12 continued
b) Calculate the maximum power that can be delivered to RL.
ECE 201 Circuit Theory I

12. Example 4.12 continued
What percentage of the power delivered by the 360 V source reaches RL? +
Vab -
Isource
ECE 201 Circuit Theory I

13. Example 4.12 continued
Percentage of source power delivered to the load
ECE 201 Circuit Theory I