3/28 Thevenin's Theorem

        The purpose of this lab is to verify the equation of finding the Thevenin's resistance. First, we need to calculate the Thevenin's resistance in the pre-lab. Then replace the entire circuit with the Thevenin's resistance to see if the voltage or current changes.

1. Sketch of the Thevenin equivalent circuit you determined in the pre-lab. Label the Thevenin resistance and the open-circuit voltage on you sketch:

2.A schematic of the circuit you implemented in the lab procedure. Label he schematic with the actual resistance values used.

actual resistance(inside the parenthese):
1k(0.96k), 2.2k(2.15k), 4.7k(4.6k), 6.8k(6.68k), 1.8k(1.74k), 6.8k(6.68k)

This is the set up of our experiment.

3. Provide your measured values for the Thevenin resistance and the open-circuit voltage from part 2 of the lab procedures. Also provide the percent error between your measured values and your expectations from the pre-lab analysis.

Thevenin Resistance:

percent error: (7.7K-7.4k)/7.7K*100% = 3.9%

Thevenin Voltage:

4. In the space below, provide your result from part 3 from the lab assignment, including:

a. value of load resistor: 7.7K

b. the measured load resistor voltage: 0.167 V

c. expect value of load voltage: 0.165 V 

percent error = (0.167-0.165)/0.165 * 100%1.21%

5. Your plot of power vs. load resistance generated in part 5 of the lab procedures. Provide your estimate(from the data) of the load resistance which draws maximum power from the circuit.

maximum power occurs when Rl = 8.5K

Summary

         In today's class, we learned how to use the Everycircuit. The Everycircuit is very convenient because we can build all the circuit use it. Then, we learned how to find the Thevenin Resistance and voltage.