PHY134  Classical Physics II Laboratory
LR(C) Circuits
In this experiment, we observe the transient behavior of series LR (inductanceresistance) and
LRC (inductanceresistancecapacitance) circuits.
Equipment
•
Oscilloscope,
•
Function generator,
•
Inductor coil, decade resistance box, decade capacitance box.
Method
In Part I, a square wave is applied to a series LR circuit. The period of the square wave is
adjusted to be long compared with the time constant of the LR circuit and the exponential
approach to steady state is observed.
In Part II, a square wave is applied to a series LRC circuit and the damped oscillations are
observed.
Procedure
I.
LR Circuit
Connect the circuit as shown in Figure 1:
Set the function generator to produce 1000 Hz square waves of maximum amplitude.
Adjust the decade resistor
R
to 100
Ω
. Adjust the oscilloscope for clear viewing
conditions. Use the DC mode.
Q1
. Sketch the oscilloscope trace and explain what is happening at each
point. Record enough points on the trace so that you can reproduce the
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trace accurately in your report.
Q2
. Plot log(
V
/
V
0
) vs.
t
, where
V
is the voltage across the inductor at time
t
and
V
0
is the voltage at
t
= 0 (at the beginning of the square wave).
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 Spring '04
 Rijssenbeek
 Physics, Capacitance, Inductance, Resistance, Square wave, Inductor, LRC

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