PHY132
Resonance in LRC Circuits

Joshua Manski
Partner: Sandra Thoms
Date: November 20
th
2008
SLN# 82129, Thursday 12:00pm
Brian Morrison
Objectives
:
In this lab we set out to study the relationship between power (through a resistor) and
frequency in an LRC circuit. By varying the frequency in the circuit we were able to determine
the max current flow at resonance. From the relationship between power and frequency we were
able to model a nonlinear fit for the plot. In the last part of this lab we examined the damped
oscillation of a square wave at a low frequency through the resistor. From the damped oscillation
plot we determined some constants for the circuit.
Experimental Procedure
:
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View Full DocumentTo start this experiment we needed to build a LRC circuit than consisted of a resistor, a
capacitor, and an inductor in series. Then this circuit was connected to a signal generator. The
schematic for this circuit is shown in the figure below.
Before we turned on the signal generator we measured the resistance of the inductor and
noted it down. The signal generator was then turned on and channel one from the Scope was
connected across the resistor and channel two was connected across the source. Using the DMM
was adjusted the signal generator so that it had 1 volt RMS sine wave at a frequency of 2kHz.
The DMM was moved back to the resistor and we adjusted the frequency in order to find the
maximum voltage across the resistor which was our resonance frequency. This was repeated two
more times and recorded so that we had three different resonance frequencies.
In the second part of the experiment we needed to measure the voltage as we tuned
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 Spring '10
 TSEN
 RC Circuits, Power, damped oscillation, signal generator, LRC Circuit

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