Lab 4: Nodal Analysis III


Lab 4: Nodal Analysis III
March 8, 2018

Purpose: In this lab, we use nodal analysis to analyze a circuit with multiple sources to predict currents and voltages. Next we construct the circuit and take measurements to confirm our predictions.

We analyzed the following circuit:


By nodal analysis, we find the voltage, Vc, as the only unknown. We calculated the voltage to be 2.408V, as shown below:


The lab asked for voltage V1 which is Vc-0 or 2.408V. We were also asked for current, I1, which we calculated to b2 0.272 mA.


Next we constructed the circuit and measure V1 and I1 directly.





As shown, we measured the voltage to be 2.45V, a difference of 1.7% from predicted, and 0.35mA, a difference of 22%.

Conclusion: The lab was very successful in predicting the voltage drop across a resistor by nodal analysis. Although the difference between actual and expected current was more than 20%, it was still an acceptable means of predicting current.

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Lab 3: Nodal Analysis March 6, 2018 Purpose: In this lab we use nodal analysis techniques for circuits with multiple power supplies. By analyzing the currents at circuit nodes, we can calculate what the voltage at those nodes will be. For the pre-lab we analyze circuit on paper before building the circuit, taking measurements and comparing results. Below is the pre-lab analysis that was conducted on the circuit shown: The voltages predicted were 2.36V for V1 and 4.36V for V2. Next we constructed the circuit as shown below: We used the Analog Discovery tool to provide the required power supplies and took measurements with a DMM. We measured the voltages as 2.34V at V1 and 4.33V at V2. This is a difference of 0.8% for V1 and and 0.7% for V2.  Conclusion: The results for the measured and expected voltages are very close and better than I anticipated. The lab was successful and shows that nodal analysis is an accurate means of analyzing a ci...
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