3/23 Superposition II

          The purpose of this lab is to verify the analogy method: superposition using the experimental way. We first need to calculate the voltage and current using the superposition. Then find the actual voltage and current. Compare them to find the percent error.


Here is the photo of our experiment: 

According to our calculation, the experimental value of voltage across the 6.8K resistor should be1.99V.

Procedure of this Lab:
1. Turn off all independent sources except one source. Find the output (voltage or current) due to that active source using nodal or mesh analysis.
2. Repeat step 1 for each of the other independent sources.
3. Find the total contribution by adding algebraically all the contributions due to the independent sources.

Set up of our experiment:

Voltage across 6.8K resistor when voltage source is 5V:

Voltage across 6.8 resistor when voltage source is 3V:

This is our result table:

Summary

        In today's class, we learned the superposition. The definition of superposition is that:  The superposition theorem for electrical circuits states that for a linear system the response (voltage or current) in any branch of a bilateral linear circuit having more than one independent source equals the algebraic sum of the responses caused by each independent source acting alone, where all the other independent sources are replaced by their internal impedances.