Phasors: Passive RL Circuit Response

Before proceeding to the lab, we did a number of exercises with phasors and phasor arithmetic.

Circuit diagram with calculation of cutoff frequency and voltage gain for a number of frequencies.

Implemented circuit, analog discovery connected to measure input voltage and inductor voltage.

Measured input and output voltage and calculated current at 470krad/s

Summary

Calculating gains as Vo/Vi and reading phase angles from oscilloscope output, then comparing to theoretical gain and phase angle arctan(w L / R), we find errors of less than 5% for gain in all frequencies tested. Phase angles, however, had errors of 10-20%. Overall, our theoretical expectations are largely consistent with the practical implementation.