PASCO EM-8656 AC_DC ELECTRONICS LABORATORY User Manual
Page 59
55
012-05892A
AC/DC Electronics Laboratory
®
Data Table
Freq(Hz)
V
o
V
R
Freq(Hz)
V
o
V
R
10
90
20
100
30
110
40
120
50
130
60
140
70
150
80
Item
Value
Resonant frequency
Hz
Resonant angular frequency
Hz
Inductance
mH
Capacitance
µ
F
Theoretical resonant angular frequency
Hz
Questions
➀
How does your measured value for resonant angular frequency compare to the theoretical value
for resonant angular frequency?
Remember,
Percent difference
=
theoretical
−
actual
theoretical
x100%
➁
Is the plot of current (V
R
/V
o
) versus frequency symmetrical about the resonant frequency?
Explain.
➂
At resonance, the reactances of the inductor and the capacitor cancel each other so that the
impedance (Z) is equal to just the resistance (R). Calculate the resistance of the circuit by using
the amplitude of the current at resonance in the equation
R =
V
I
(where V is the amplitude of
the applied voltage). Is this resistance equal to 10
Ω
? Why not?